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Culture Conditions Affect The Nutritional Value Of The Copepod Acartia Tonsa, Arne M. Malzahn, Nicole Aberle-Malzahn, Katherina Schoo, Maarten Boersma Apr 2025

Culture Conditions Affect The Nutritional Value Of The Copepod Acartia Tonsa, Arne M. Malzahn, Nicole Aberle-Malzahn, Katherina Schoo, Maarten Boersma

Journal of Agricultural and Marine Sciences

Live feed are still necessary for the rearing of larval stages of several fish species, especially marine ones. Compared to Artemia, copepods are of superior quality. This is based on a suite of traits like size, movement, and nutritional value. Copepods are for example usually high in protein and fatty acids. Essential fatty acid profiles reflect to a large degree the fatty acid supply, which provides the opportunity to manipulate fatty acid profiles of, amongst others, copepods. By manipulating nutrient supply of the algae Rhodomonas salina we were able to double essential fatty acid concentrations in naupliar and copepodit life …

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Natural Glues And Fouling Management By Interfering With Glue Curing, Daniel Rittschof, Tara Essock-Burns, Gary Dickinson, S. Zmina, N. Alberman Apr 2025

Natural Glues And Fouling Management By Interfering With Glue Curing, Daniel Rittschof, Tara Essock-Burns, Gary Dickinson, S. Zmina, N. Alberman

Journal of Agricultural and Marine Sciences

Multidisciplinary approaches and modern technology provide insights to glue curing that are stimulatingand controversial. Our team applies classic and modern theory and techniques to the study of barnacle glue. Techniques include physical measures, bacteriology, behavior, physiology, biochemistry, microscopy, spectroscopy, tomography, tandem mass spectrometry, molecular biology and proteomics. Theory is grounded in evolution and previous literature. Here, we use data from these techniques to support the hypothesis that barnacle glue curing is similar toblood clotting and propose a model for how glue cures. Similar to blood clotting, barnacle glue curing involves enzymatic activation of precursors and rearrangement of structural molecules to …

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Evaluation Of Potential Hormonal Activities Of Ashwagandha (Withania Somnifera), Guenter Vollmer Apr 2025

Evaluation Of Potential Hormonal Activities Of Ashwagandha (Withania Somnifera), Guenter Vollmer

Oxford ICSB

No abstract provided.

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Gill Monogenean Communities On Three Commercially Important Sparid Fish In Omani Waters, Gilha Yoon, Hisham Al-Adawi, Andrew Shinn Apr 2025

Gill Monogenean Communities On Three Commercially Important Sparid Fish In Omani Waters, Gilha Yoon, Hisham Al-Adawi, Andrew Shinn

Journal of Agricultural and Marine Sciences

The prevalence and intensity of polyopisthocotylean monogeneans on the gills of three commercially important species of sparid caught in Omani coastal waters close to the city port of Muscat were determined and compared. Throughout May 2012 to April 2013, infections on bi-weekly samples of the soldier seabream, Argyrops filamentosus (Valenciennes, 1830), the king soldier seabream, Argyrops spinifer (Forsskål, 1775), and, the silver seabream, Rhabdosargus sabra were evaluated. From a total of 200 specimens (standard length of 26-52 cm), caught by line angling or by traps, at least three species of gill monogenean, namely Omanicotyle [Bivagina] heterospina, Heteromicrocotyla sp. and Microcotyle …

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Gill Histology Of Nile Tilapia Oreochromis Niloticus Following Chronic And Acute Exposure To Ammonia, Gilha Yoon, Najiya Al-Saadi, Aisha Ambuali Apr 2025

Gill Histology Of Nile Tilapia Oreochromis Niloticus Following Chronic And Acute Exposure To Ammonia, Gilha Yoon, Najiya Al-Saadi, Aisha Ambuali

Journal of Agricultural and Marine Sciences

Ammonia is a common aquatic pollutant and is toxic to fish. The main nitrogenous compound excreted by fish is also ammonia, which may reach toxic concentrations in high-density fish culture, reducing growth and productivity. In this study, changes in gill structure and mucus cell distribution were examined when juvenile Nile tilapia, Oreochromis niloticus, were exposed to chronic and acute concentrations of ammonia. For chronic exposure, the tilapia were exposed to daily increments in ammonia concentration rising from 0 mg L-1 ammonia on Day 0 to 5 mg L-1 by Day 8; the experiment was terminated on Day 9. There were …

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Improving The Quality Of Tiger Shrimp Penaeus Monodon Through Dietary Incorporation Of Algae As A Source Of Natural Pigment, Kunal Mondal, Subhra Bikash Bhattacharyya, Abhijit Mitra Apr 2025

Improving The Quality Of Tiger Shrimp Penaeus Monodon Through Dietary Incorporation Of Algae As A Source Of Natural Pigment, Kunal Mondal, Subhra Bikash Bhattacharyya, Abhijit Mitra

Journal of Agricultural and Marine Sciences

Tiger shrimp is one of the major candidate species for export oriented aquaculture which dominates the seafood market in regions of European Union, Japan and USA. Carotenoid content in seafood has now become one of the important criteria in determining the quality of edible product. Recent trends in supplementing fish diets with natural pigment source are an alternative to the utilization of expensive synthetic pigments. In this context, green algae Enteromorpha intestinalis was selected as a source of natural pigment for inclusion in the diet of tiger shrimp Penaeus monodon. Astaxanthin being an important category of carotenoid pigment was monitored …

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Zooplankton Of Oman Coastal Waters, Sergey A. Piontkovski, Asila Al-Maawali, Ward Al-Muna Al-Manthri, Khalid Al-Hashmi, Elena A. Popova Apr 2025

Zooplankton Of Oman Coastal Waters, Sergey A. Piontkovski, Asila Al-Maawali, Ward Al-Muna Al-Manthri, Khalid Al-Hashmi, Elena A. Popova

Journal of Agricultural and Marine Sciences

Monthly sampling during daytime was carried out in 2007-2011 at Bandar Al-Khyran (23.51oN, 58.72oE) which is the largest semi-enclosed bay on the southern end of the Sea of Oman with about 4 km2 in surface area and an average depth of 10 m. Zooplankton were represented by Copepoda (79%), Cladocera (9%), Oikopleuriddae (7%), Chaetognatha (3%), and Decapoda (~2%) comprising the major part of the total zooplankton abundance. Among copepods, 27 species constituted ~75% of total copepod abundance. Changes of copepod abundance have not had a pronounced seasonal pattern. Instead, a multiple peak structure in monthly fluctuations was observed, on the …

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A Review Of Observations Made On Select Parameters Of The Camel Immune System, Eugene H. Johnson, Khalid R. Al-Habsi, Rashid M. Al-Busaidi Apr 2025

A Review Of Observations Made On Select Parameters Of The Camel Immune System, Eugene H. Johnson, Khalid R. Al-Habsi, Rashid M. Al-Busaidi

Journal of Agricultural and Marine Sciences

Despite the camel’s long historical interaction with man there is only a limited number of studies available pertaining to the immunobiology of this species. This is unfortunate as the camel has evolved into an animal capable of not only surviving under extreme environmental conditions but also into one that is relatively resistant to a great number of infectious diseases. Accordingly, it is of interest to understand the various components operative in the camel immune system, as a potential basis of manipulating the immune response of other domesticated animals to respond to disease-causing agents in a similarly effective fashion. Recent research …

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Composition, Quality And Health Aspects Of The Dromedary (Camelus Dromedarius) And Bactrian (Camelus Bacterianus) Camel Meats: A Review, Isam T. Kadim, Osman Mahgoub, Waleed Al-Marzooqi, Samera K. Khalaf, Gulzhan Raiymbek Apr 2025

Composition, Quality And Health Aspects Of The Dromedary (Camelus Dromedarius) And Bactrian (Camelus Bacterianus) Camel Meats: A Review, Isam T. Kadim, Osman Mahgoub, Waleed Al-Marzooqi, Samera K. Khalaf, Gulzhan Raiymbek

Journal of Agricultural and Marine Sciences

The dromedary and bactrian camels are good sources of high quality protein especially in areas where the climate adversely affects the survival of other livestock. The camel has unique physiological characteristics, including a great tolerance to high and low temperatures, solar radiation, water scarcity, rough topography and poor vegetation. Camels are mostly produced under traditional systems on poor levels of nutrition and are mostly slaughtered at old ages after completing a career in work, racing or milk production. In general, camel carcasses contain about 57% muscle, 26% bone and 17% fat with fore-quarters (cranial to rib 13) significantly heavier than …

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A Serological Study On Foot And Mouth Disease In Cattle From The Dhofar Governorate Of Oman, Rashid M. Al-Busaidi, Ahmed Al-Jassasi, Eugene H. Johnson Apr 2025

A Serological Study On Foot And Mouth Disease In Cattle From The Dhofar Governorate Of Oman, Rashid M. Al-Busaidi, Ahmed Al-Jassasi, Eugene H. Johnson

Journal of Agricultural and Marine Sciences

Foot and mouth disease (FMD) is a highly contagious viral disease that has a significant impact on the economy and livestock productivity of affected countries. Based on unpublished reports, serotype O has been incriminated as the sole serotype present in Oman. The present study was conducted in the Dhofar region of the Sultanate of Oman between August 2003 and March 2004 with the objective of determining the seroprevalence against FMDV in Dhofari cattle. Sera samples were collected from 395 cattle in 19 different herds. Sera underwent screening using a Liquid Phase Blocking ELISA to determine the antibody response to the …

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Habitat Preferences Of Juvenile Abalone (Haliotis Mariae Wood, 1828) Along The Dhofar Coast Of Oman And Implications For Conservation, Schalk Willem Petrus De Waal, Mohammed Balkhair, Ali Al-Mashikhi, Salem Khoom Apr 2025

Habitat Preferences Of Juvenile Abalone (Haliotis Mariae Wood, 1828) Along The Dhofar Coast Of Oman And Implications For Conservation, Schalk Willem Petrus De Waal, Mohammed Balkhair, Ali Al-Mashikhi, Salem Khoom

Journal of Agricultural and Marine Sciences

Surveys were conducted along the eastern Dhofar coast of Oman to investigate densities and habitat preferences of juvenile Haliotis mariae (< 3 cm SL). Average density was 0.62 m-2 (SD 0.56); average urchin density was 3.4 urchins m-2 (SD 3.9). Relationships between juvenile abalone densities and small boulders (<30 cm in diameter (Ø)) tested significant (p = 0.049), as did those between juvenile abalone and urchin densities (p = 0.031). Selectivity (w) and standardized (B) ratios quantifying the relative probability of selection by juvenile abalone for different categories of resource available were calculated. For the studied area B values tested significantly different for (p = 0.004) the different habitats, urchins, boulders <30 cm, 30> <50 cm, and >50 cm Ø, respectively. B values were highest for urchins (6 times that for small boulders), and for boulders <30 cm Ø (double that for boulders 30> <50 cm Ø). B values for boulder habitats decreased as boulder size increased. Urchin utilisation by juvenile abalone as shelter ranged between geographic areas from a minimum of 15.5% to a maximum of 47.6%. The proportion of total habitat that is preferred by more than 97% of juvenile abalone found, including urchins and boulders < 50 cm Ø, comprises 29% of surveyed substratum. While the role urchins play on wild juvenile H. mariae has not proved vital, it is definitely significant. Although juvenile densities are low and are not currently limited by the availability of suitable habitat, it is crucial to identify and conserve those microhabitats that support recruitment of H. mariae. The abundance of these areas should be among the criteria used in selecting protected conservation areas.

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Species Identification Of Rock Oysters Collected From The Dhofar Region, Sultanate Of Oman, Mikhail V. Chesalin, Salem A. Al-Ghassani, Mohammed A. Balkhair Apr 2025

Species Identification Of Rock Oysters Collected From The Dhofar Region, Sultanate Of Oman, Mikhail V. Chesalin, Salem A. Al-Ghassani, Mohammed A. Balkhair

Journal of Agricultural and Marine Sciences

Oysters are commonly found on rocky shores along the Dhofar coast of Oman, but the species composition has not yet been studied. In an attempt to determine the species of these oysters, samples from four sites (Mirbat, Sadah, Hadbin, and Hasik) were collected and analyzed using DNA sequences that were compared with the database of GenBank/National Center for Biotechnology Information (NCBI) and Barcoding of Life Data Systems (BOLD). BLAST results of DNA sequences showed that there were no existing sequences available on NCBI/GenBank and BOLD. The DNA barcode sequences generated in this study can be employed as standards for this …

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Spatial-Temporal Distribution Of The Palinurid And Scyllarid Phyllosoma Larvae In Oman Coastal Waters, Sergey Khvorov, Sergey Piontkovski, Elena Popova Apr 2025

Spatial-Temporal Distribution Of The Palinurid And Scyllarid Phyllosoma Larvae In Oman Coastal Waters, Sergey Khvorov, Sergey Piontkovski, Elena Popova

Journal of Agricultural and Marine Sciences

The Bongo Net samples collected between 2005 and 2008 in the Sea of Oman and in the north-western part of the Arabian Sea (near Massirah Island) were analyzed, for a pilot assessment of seasonal and spatial distribution of the phyllosoma larvae. In the samples collected, 84% of all phyllosoma larvae were from the family Palinuridae, while the others were contributed by family Scyllaridae. All larvae of Panulirus homarus were in the first development stage and had a mean body length of 1.30±0.89mm. The phyllosoma larvae of the less abundant family Scyllaridae were in the second, third, and fourth development stages, …

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Experimental Rearing Of Spiny Lobster, Panulirus Homarus (Palinuridae) In Land-Based Tanks At Mirbat Station (Sultanate Of Oman) In 2009-2010, Mohammed Balkhair, Ali Al-Mashiki, Mikhail Chesalin Apr 2025

Experimental Rearing Of Spiny Lobster, Panulirus Homarus (Palinuridae) In Land-Based Tanks At Mirbat Station (Sultanate Of Oman) In 2009-2010, Mohammed Balkhair, Ali Al-Mashiki, Mikhail Chesalin

Journal of Agricultural and Marine Sciences

Two experiments on the rearing of the spiny lobster Panulirus homarus were conducted in land-based tanks at Mirbat Aquaculture Unit from June to December 2009 and January-December 2010. In the first experiment 14 lobsters with an average size of 64.9±7.4 mm CL and weight of 297.8±98.0 g were reared to an average of 71.7±7.2 mm CL and weight of 384.0±114.8 g over 187 days. In the second experiment 45 lobsters were reared from an initial length of 45.4±4.6 mm CL and weight of 118.9 g to a length 66.0±7.1 mm CL and a weight of 304.1 g over 335 days. …

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The Omani Coastal Traditional Sardine Fishery 1994-2007: A Review, Saud Al-Jufaili, Omar S. Al-Jahwari Apr 2025

The Omani Coastal Traditional Sardine Fishery 1994-2007: A Review, Saud Al-Jufaili, Omar S. Al-Jahwari

Journal of Agricultural and Marine Sciences

The Omani coastal fishery is categorized into small pelagics, large pelagics, demersals, shellfishes, and sharks and rays. During the period 1994-2007 the small pelagics contributed 39 and 21% to the total Omani fisheries landings and values respectively. During 1994-2007 sardines alone contributed 76 and 51% to the total small pelagics landings and values, respectively. Al-Batina and Muscat regions contributed the highest to the total landings; among other Omani regions, Musandam, Muscat, and Sharqiya and Al-Wusta regions. Total sardines prices ranges from 114 to 225 Omani Rials per ton depending on where the sardines are coming from. On the other hand, …

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Changes In Scomberotoxin (Histamine) And Volatile Amine (Tvb-N) Formation In Longtail Tuna (Thunnus Tonggol) Stored At Different Temperatures, Moza Abdallah Al-Busaidi, Poulose Yesudhason, Khamis Saif Al-Falahi, Adel Khalifa Al-Nakhaili, Nashwa Ali Al-Mazrooei, Saoud Hamood Al-Habsi Apr 2025

Changes In Scomberotoxin (Histamine) And Volatile Amine (Tvb-N) Formation In Longtail Tuna (Thunnus Tonggol) Stored At Different Temperatures, Moza Abdallah Al-Busaidi, Poulose Yesudhason, Khamis Saif Al-Falahi, Adel Khalifa Al-Nakhaili, Nashwa Ali Al-Mazrooei, Saoud Hamood Al-Habsi

Journal of Agricultural and Marine Sciences

Changes in histamine and volatile amine (TVB-N) formation was studied in longtail tuna (Thunnus tonggol) captured in the Sea of Oman and stored at different temperatures. Based on sensory analysis, longtail tuna maintained shelf life for 1, 4, 15 and 300 days at 0, 8, 25 and -18 oC, respectively. Histamine and TVB-N increased with time, but the rate of change varied with storage temperature. Histamine formation was suppressed significantly at lower than the FDA limit of 5 mg/100 g at 0 and -18 oC but not at 8 or 25 oC. TVB-N did not reflect the quality index at …

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Fish Kill Incidents And Harmful Algal Blooms In Omani Waters, Hamed Mohammed Al-Gheilani, Kazumi Matsuoka, Abdulaziz Yahya Alkindi, Shehla Amer, Colin Waring Apr 2025

Fish Kill Incidents And Harmful Algal Blooms In Omani Waters, Hamed Mohammed Al-Gheilani, Kazumi Matsuoka, Abdulaziz Yahya Alkindi, Shehla Amer, Colin Waring

Journal of Agricultural and Marine Sciences

Red tide, one of the harmful algal blooms (HABs) is a natural ecological phenomenon and often this event is accompanied by severe impacts on coastal resources, local economies, and public health. The occurrence of red tides has become more frequent in Omani waters in recent years. Some of them caused fish kill, damaged fishery resources and mariculture, threatened the marine environment and the osmosis membranes of desalination plants. However, a number of them have been harmless. The most common dinoflagellate Noctiluca scintillans is associated with the red tide events in Omani waters. Toxic species like Karenia selliformis, Prorocentrum arabianum, and …

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The In Vitro Activity Of A Range Of Natural Bioflavonoids Against Five Species Of Pathogenic Fish Bacteria, Gil Ha Yoon, Sarah Al Jufaili, Aliya Al Ghabshi, Nashwa Al Mazrooei Apr 2025

The In Vitro Activity Of A Range Of Natural Bioflavonoids Against Five Species Of Pathogenic Fish Bacteria, Gil Ha Yoon, Sarah Al Jufaili, Aliya Al Ghabshi, Nashwa Al Mazrooei

Journal of Agricultural and Marine Sciences

The in vitro antibacterial activity of thirty two plant-derived compounds (26 crude herbal extraction and 6 pure citrus-based bioflavonoids) were tested on five different species of aquatic bacterial pathogens (Aeromonas hydrophila, A. salmonicida, A. sobria, Edwardsiella ictaluri, and E. tarda) over a period of 72 hours at 22 oC. From the agar diffusion test, six pure citrus-based bioflavonoids (apigenin, catechin, hesperidin, morin, naringin and quercetin) appeared to impact on growth when used at concentrations ranging from 10 ppm - 1000 ppm. To confirm their effect on the growth dynamics of each bacteria, a 1000 ppm dose of the appropriate bioflavonoid …

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Meat Production Potential Of Small Ruminants Under The Arid And Semi-Arid Conditions Of Pakistan, Mohamed Fatah Ullah Khan, Faisal Ashfaq Apr 2025

Meat Production Potential Of Small Ruminants Under The Arid And Semi-Arid Conditions Of Pakistan, Mohamed Fatah Ullah Khan, Faisal Ashfaq

Journal of Agricultural and Marine Sciences

Sheep and goat production is one of the major economic activities under the arid and semi-arid condition of Pakistan. The country has 53.8 million goats and 26.5 million sheep. The main purpose of raising these small ruminants in the country is meat production. The small ruminants share about 40% of total red meat produced in the country. It has been observed that in the last several years the overall per capita consumption of the animal food products is increasing. Overall annual growth rate of goats in Pakistan is 4%, which is the highest in Asia. Pakistan ranks third in Asia …

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Pesticide Resistance In Stored-Product Insects And Alternative Biorational Management: A Brief Review, Farid Talukder Apr 2025

Pesticide Resistance In Stored-Product Insects And Alternative Biorational Management: A Brief Review, Farid Talukder

Journal of Agricultural and Marine Sciences

Conventional pesticides are being used as the major tools for stored grain and food protection. Many conventional pesticides have created problems including pesticide resistance, toxic residues in the treated products, handling hazards, health hazards to operatives and pest resurgence. Among these, the incidence of pesticide resistance is a growing problem in stored product protection. Problems associated with synthetic pesticides, especially pesticide resistance, have created a worldwide interest in the development of alternative biorational strategies. Plant-derived materials, biological control agents, insect growth regulators, solar disinfestation systems, use of inert dusts and diatomaceous earth, etc., are potential viable alternatives. Most of these …

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Bioactive Compounds From Omani Sea Cucumbers, Sergey Dobretsov, Iman Mohammed Al-Mammari, Bassam Soussi Apr 2025

Bioactive Compounds From Omani Sea Cucumbers, Sergey Dobretsov, Iman Mohammed Al-Mammari, Bassam Soussi

Journal of Agricultural and Marine Sciences

Antimicrobial, anti-diatom and anti-larval activities of both water soluble (water extracts) and non-water soluble metabolites (methanol: chlorophorm, 1:1 extracts) of the sea cucumbers Holothuria atra and Holothuria edulis from Bander AL-Khiran region, Oman were tested in this study. There was no significant effect of the extracts from sea cucumbers on bacterial (3 reference bacteria from seawater and pathogens Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, Pseudomonas aeruginosa, Streptococcus pneumoniae, Streptococcus pyogenes, Staphylococcus epidermidis) and the diatom Chaetoceros sp. growth. Both water extracts and methanol: chlorophorm extracts caused significant mortality of Artemia salina nauplia. This study suggests that Omani sea cucumbers might …

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A First Record Of Whip Lobsters Puerulus Sewelli From Oman With Notes On Size, Condition And Length-Weight Relationships, Abdullah Al-Nahdi, Abdulaziz Al-Marzouqi, Johan C. Groeneveld, Ahmed Al-Hosni Apr 2025

A First Record Of Whip Lobsters Puerulus Sewelli From Oman With Notes On Size, Condition And Length-Weight Relationships, Abdullah Al-Nahdi, Abdulaziz Al-Marzouqi, Johan C. Groeneveld, Ahmed Al-Hosni

Journal of Agricultural and Marine Sciences

Arabian whip lobsters Puerulus sewelli

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Predicting The Distribution And Abundance Of Emperor Fishes (Lethrinus Spp.) In The Arabian Sea Using Two-Stage Generalized Additive Models And A Geographic Information System, Lubnah H. Al-Kharusi Apr 2025

Predicting The Distribution And Abundance Of Emperor Fishes (Lethrinus Spp.) In The Arabian Sea Using Two-Stage Generalized Additive Models And A Geographic Information System, Lubnah H. Al-Kharusi

Journal of Agricultural and Marine Sciences

The distribution and abundance of emperor fishes (Lethrinidae) along the Arabian Sea coast of Oman were analysed from commercial catch-per-unit-effort data for the periods 1996-2004 and 2005, respectively. Two-stage generalized additive models (GAM) were used to detect trends in abundance relative to environmental variables. The GAM that included month (positive in August and October), sea surface temperature (SST; positive at 25-27˚C) and longitude (positive between 57°50’ E-58°50’ E) explained the highly variable distribution and abundance patterns best. ArcGIS-9 was used as an auxiliary to visualize seasonal trends that could not be seen from the statistical GAM analysis. From the spatial …

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Length-Weight Relationships, Maturity, And Reproductive Season Of The Fringelip Mullet Crenimugil Crenilabis (Forsskål, 1775) From The Arabian Sea Coast Of Oman, Abdullah Al-Nahdi, Abdulaziz Al-Marzouqi, Said Al-Shajibi, Ahmed Al-Hosni Apr 2025

Length-Weight Relationships, Maturity, And Reproductive Season Of The Fringelip Mullet Crenimugil Crenilabis (Forsskål, 1775) From The Arabian Sea Coast Of Oman, Abdullah Al-Nahdi, Abdulaziz Al-Marzouqi, Said Al-Shajibi, Ahmed Al-Hosni

Journal of Agricultural and Marine Sciences

Fringelip mullet (Crenimugil crenilabis) caught at Al Duqum and Salalah in the Arabian Sea region of Omanwere sampled monthly between January 2001 and December 2002. The total length (TL) of mullet caught with gill- and seine nets ranged from 12 to 54.5 cm (32.4 cm mean ± SD; n = 2445) but <2% of specimens had a TL<24 cm, suggesting gear selectivity. Females dominated samples (1 : 0.36) and reached L at 32.8 cm TL (32.2 cm in males). Length weight relationships were non-linear and conversion factors between TL, fork length (FL) and standard length (SL) were calculated. Proportionately, most females had ripe gonads in September and October, and males in September to November. Both female and male gonadosomatic indices (GSI) peaked in September and October and were lowest between May and August. The peak in reproductive activity coincides with the fall intermonsoon, when the Arabian Sea upwellings caused by the onshore winds of the SW monsoon season (June to August/September) retreat. During this intermonsoon period the inshore water temperatures begin to rise after reaching a minimum in August/September. Some reproductive activity also occurs in other months, particularly February, when water temperatures are seasonally lower.

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Reproductive Season Of The Scalloped Spiny Lobster Panulirus Homarus Along The Coast Of Oman: Management Implications, Abdulaziz Al-Marzouqi, Johan C. Groeneveld, Abdullah Al-Nahdi, Ahmed Al-Hosni Apr 2025

Reproductive Season Of The Scalloped Spiny Lobster Panulirus Homarus Along The Coast Of Oman: Management Implications, Abdulaziz Al-Marzouqi, Johan C. Groeneveld, Abdullah Al-Nahdi, Ahmed Al-Hosni

Journal of Agricultural and Marine Sciences

The spiny lobster Panulirus homarus is widely distributed in the Indo-West Pacific. Along the coast of Oman it supports an artisanal fishery using traps and tangle nets. The egg-bearing incidence of females caught between 1989 and 2006 were analysed relative to month, lobster size and location of capture. The smallest female with external eggs had a carapace length (CL) of 54.6 mm, but only 9-18% of females of 60-69 mm CL carried eggs. This percentage increased significantly above 70 mm CL, and on average, 63% of individuals >90 mm carried eggs. Egg-bearing increased seasonally at the onset of the SW …

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Length And Weight Relationships For 31 Species Of Fishes Caught By Trawl Off The Arabian Sea Coast Of Oman, Brett A. Human, Haithem Al-Busaidi Apr 2025

Length And Weight Relationships For 31 Species Of Fishes Caught By Trawl Off The Arabian Sea Coast Of Oman, Brett A. Human, Haithem Al-Busaidi

Journal of Agricultural and Marine Sciences

Length and weight measurement for 31f ish species encountered in the Arabian Sea , o f f t h e Oma n Coast, were collected by demersal trawling during March 2007 and March 2008. A total of 3,261 specimens were measured for total length, or fork length, where appropriate, and green weight. Several commonly caught commercial species undergo onboard processing (dressing) prior to packaging, and dressed weight to green weight regressions and conversion factors were calculated for 12 of these species. The relationships obtained in this study were compared with those of other studies for the same fish species. These …

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Abalone, Haliotis Mariae (Wood, 1828), Hatchery And Seed Production Trials In Oman, Khalfan M. Al-Rashdi, Tsueno Iwao Apr 2025

Abalone, Haliotis Mariae (Wood, 1828), Hatchery And Seed Production Trials In Oman, Khalfan M. Al-Rashdi, Tsueno Iwao

Journal of Agricultural and Marine Sciences

Hatchery and seed production trials for the Omani endemic abalone Haliotis mariae were carried out at the land-based Mirbat Abalone Seed Production Station in Oman between 1999 and 2000. The methods developed for broodstock conditioning, induction of spawning and fertilization, larval settlement, and the handling of small juveniles are shown. Abalone collected in the post-monsoon period and held for 2 months matured faster than those collected before the monsoon and held for 6 months. Spawning induction of males and females had 63% and 11% success rates respectively, and the morphology of early larval stages is shown. Survival rates of veliger …

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Effects Of Hypoxia On The Behaviour, Mortality And Plasma Electrolyte Concentrations Of Goldlined Seabream, Rhabdosargus Sarba, Hamed M. Al-Gheilani, Colin Waring, Abdulaziz Al-Kindi, Shehla Amer Apr 2025

Effects Of Hypoxia On The Behaviour, Mortality And Plasma Electrolyte Concentrations Of Goldlined Seabream, Rhabdosargus Sarba, Hamed M. Al-Gheilani, Colin Waring, Abdulaziz Al-Kindi, Shehla Amer

Journal of Agricultural and Marine Sciences

The behaviour, mortality rates and plasma electrolyte concentrations of goldlined seabream Rhabdosargus sarba challenged with low dissolved oxygen (DO) conditions was studied in an experimental setup, comprising a control (7.9 ml/l DO) and two hypoxic (2 ml/l and 1 ml/l DO) treatments. Increased ventilation rates and decreased swimming activity were observed in hypoxic treatments, but some fish exhibited strenuous avoidance actions. No mortalities were observed after 3 h, 6 h, or 24 h, but 50% of males and 18% of females died in the 48 h treatment at 1 ml/l DO. The mean size of surviving fish (305± 32.1 g …

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Differential Response Of Barley (Hordeum Vulgare L.) To Salinity, Hamid Ali Ghaloub, Saleem K. Nadaf, Saif Ali Al-Khamisi Apr 2025

Differential Response Of Barley (Hordeum Vulgare L.) To Salinity, Hamid Ali Ghaloub, Saleem K. Nadaf, Saif Ali Al-Khamisi

Journal of Agricultural and Marine Sciences

Four elite barley cultivars (Jimah 51, Jimah 54, Jimah 98 and Jimah 136) along with two local cultivars, Beecher (late maturity) and Duraqi (early maturity), were investigated for their response to five levels of irrigation water salinity viz. control (1 dS m-1), 3, 9, 12 and 15 dS m-1 during the winter seasons of 2002-03 and 2003-04 in pots containing sandy loam soil. The results indicated that the main effects of years, salinity and cultivars were highly significant (p<0.01) with respect to all the characters studied. Among the interactions, the effects of year x salinity and year x cultivar were highly significant (p<0.01) for all the characters, whereas that of salinity x cultivar was highly significant (p<0.01) for only two characters viz. plant height and dry matter yield. However, 3-factor interaction was not significant (p>0.05) for any character. Adverse effects of salinity were evident in the cultivars for all characters. Salinity tolerance of cultivars was …

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Density And Size Distribution Of The Sea Cucumber, Holothuria Scabra (Jaeger, 1935), At Six Exploited Sites In Mahout Bay, Sultanate Of Oman, Khalfan M. Al-Rashdi, Michel R. Claereboudt, Saud S. Al-Busaidi Apr 2025

Density And Size Distribution Of The Sea Cucumber, Holothuria Scabra (Jaeger, 1935), At Six Exploited Sites In Mahout Bay, Sultanate Of Oman, Khalfan M. Al-Rashdi, Michel R. Claereboudt, Saud S. Al-Busaidi

Journal of Agricultural and Marine Sciences

A rapid survey of the density and size distribution of recently exploited populations of Holothuria scabra in Mahout Bay (Ghubbat Hashish Bay) was carried out at six fishing sites. The results showed that population densities varied between 1170 and 4000 individuals ha-1 and biomass ranged between 393 and 2903 kg ha-1. The mean size of sea cucumbers and population densities were much lower in populations closer to human settlements, suggestive of overfishing. The sex ratio was estimated to be 1:1 and the size distributions of males and females did not differ significantly. The length-weight relationship for both sexes was calculated …

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