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Articles 1 - 12 of 12
Full-Text Articles in Life Sciences
Toxic Effect Of Lead Chloride On Antioxidant Enzyme In The Liver And Kidney Of Fish, Bakhtawar Raza, Muhammad Javed, Faiza Ambreen, Fariha Latif
Toxic Effect Of Lead Chloride On Antioxidant Enzyme In The Liver And Kidney Of Fish, Bakhtawar Raza, Muhammad Javed, Faiza Ambreen, Fariha Latif
Journal of Bioresource Management
The contamination of aquatic habitats has become a serious problem for sustainability of the fisheries sector in Pakistan. Among different pollutants, heavy metals are very toxic. Their toxicity can be assessed by using antioxidant enzymes as biomarkers. These enzymes protect the living organisms from the oxidative stress caused by the heavy metals. Therefore, the effect of lead chloride (PbCl2) on the peroxidase enzyme activity in the tissues (liver and kidney) of Cirrhinamrigala was investigated. Four groups of Cirrhinamrigala were exposed, separately, to 96-hr LC50 concentration of PbCl2 along with its sub-lethal concentrations, viz.2/3rd, 1/4th and 1/5th for a period of …
Effect Of Manganese Chloride (Mncl2) On Peroxidase Activity In Labeo Rohita, Nadia Altaf, Muhammad Javed, Sidra Abbas
Effect Of Manganese Chloride (Mncl2) On Peroxidase Activity In Labeo Rohita, Nadia Altaf, Muhammad Javed, Sidra Abbas
Journal of Bioresource Management
Four groups (n=10) of one year old Labeo rohita were exposed to 96-hr LC50 and sub-lethal (2/3rd, 1/4th and 1/5th) concentrations of MnCl2 for a duration of 30 days in the glass aquaria of 50L water capacity. After an exposure period of 30 days, the activity of peroxidase enzyme in the liver and brain of MnCl2 exposed fish was measured and compared with the control group. Physico-chemical parameters of the test media, viz. pH, dissolved oxygen, carbon dioxide, total ammonia, total hardness, calcium and magnesium were also monitored on a 12 hour basis during the whole experimental duration by following …
Policy On The Application Of Fish Size Limits In Western Australia, Department Of Fisheries
Policy On The Application Of Fish Size Limits In Western Australia, Department Of Fisheries
Fisheries management papers
No abstract provided.
Green And Choking: Exploring The Dynamics Of Seasonal Productivity And Hypoxia In A Great Lakes Area Of Concern And Habitat Blueprint Estuary Using Time-Series Measurements, Anthony D. Weinke
Masters Theses
Although hypoxia (dissolved oxygen <4 mg L-1) in the bottom waters of lakes, reservoirs, and estuaries may be a natural product of stratification in eutrophic or mesotrophic systems, there is increasing concern because the occurrence of hypoxia is spreading in many areas where hypoxia did not previously exist. Part of this new knowledge can be attributed to time-series data from buoy observatories that monitor systems in good weather and in bad, and allowing insight into the inner workings of a lake where sampling only a few times per year would not. This study made use of a five-year time-series of meteorological and water quality data in order to examine the effect of episodic wind-events on stratification and hypoxia within Muskegon Lake, Michigan, as well as performing bi-weekly lake-wide monitoring to evaluate the effects of stratification, hypoxia, and wind-events on the lake. In the wind-event portion of the study, we found that events where wind speeds were above average for an extended period of time occurred fairly frequently on the lake, but that thermal stratification allowed only the strongest events to significantly mix the water column at the buoy location a few times per year. This provided infrequent relief of hypoxia in the bottom waters. The second portion of the study found extensive effects on the water quality and biology in the bottom of the lake due to hypoxia such as increased phosphorus concentrations, enhanced phycocyanin following a strong windevent, and decreased fish abundance, richness, and size. We also found that hypoxia occurred lake-wide at all four sample locations, but was most stable at the deepest point in the lake that was least influenced by wind-events. It is possible that the combination of hypoxia and strong episodic wind-events leads to entrainment of phosphorus-rich waters to the surface initiating or continuing an algal bloom. Hypoxia and wind-event mediated internal loading of phosphorus could be a positive feedback loop for cyanobacterial blooms and hypoxia in Muskegon Lake.
Population Viability Analysis For Endangered Roanoke Logperch, James Henry Roberts, Paul L. Angermeier, Gregory B. Anderson
Population Viability Analysis For Endangered Roanoke Logperch, James Henry Roberts, Paul L. Angermeier, Gregory B. Anderson
Department of Biology Faculty Publications
A common strategy for recovering endangered species is ensuring that populations exceed the minimum viable population size (MVP), a demographic benchmark that theoretically ensures low long-term extinction risk. One method of establishing MVP is population viability analysis, a modeling technique that simulates population trajectories and forecasts extinction risk based on a series of biological, environmental, and management assumptions. Such models also help identify key uncertainties that have a large influence on extinction risk. We used stochastic count-based simulation models to explore extinction risk, MVP, and the possible benefits of alternative management strategies in populations of Roanoke logperch Percina rex, an …
Using Rad‐Seq To Recognize Sex‐Specific Markers And Sex Chromosome Systems, Tony Gamble
Using Rad‐Seq To Recognize Sex‐Specific Markers And Sex Chromosome Systems, Tony Gamble
Biological Sciences Faculty Research and Publications
Next‐generation sequencing methods have initiated a revolution in molecular ecology and evolution (Tautz et al. 2010). Among the most impressive of these sequencing innovations is restriction site‐associated DNA sequencing or RAD‐seq (Baird et al. 2008; Andrews et al. 2016). RAD‐seq uses the Illumina sequencing platform to sequence fragments of DNA cut by a specific restriction enzyme and can generate tens of thousands of molecular genetic markers for analysis. One of the many uses of RAD‐seq data has been to identify sex‐specific genetic markers, markers found in one sex but not the other (Baxter et …
The Effect Of Seasonal Fish Migration On Energy Budgets In Two Coastal Michigan Streams, Emily M. Dean
The Effect Of Seasonal Fish Migration On Energy Budgets In Two Coastal Michigan Streams, Emily M. Dean
Masters Theses
Migratory fish are known to seasonally enter coastal stream systems but the magnitude of the effects these migrations have on stream energy budgets is not fully understood. The Laurentian Great Lakes have several introduced and native adfluvial fish, where only a few studies have investigated the impacts of their migration on energy budgets in Michigan coastal streams. We quantified the contribution of energy from Chinook salmon (Oncorhynchus tshawytscha) muscle and eggs, steelhead (Oncorhynchus mykiss) eggs, and larval white suckers (Catostomus commersonii) to coastal stream energy budgets. Energy densities and energy delivered to streams were estimated using bomb calorimetry and annual …
Determination Of The Gut Retention Of Plastic Microbeads And Microfibers In Goldfish 1 (Carassius Auratus), Stefan Grigorakis, Sherri A. Mason, Ken G. Drouillard
Determination Of The Gut Retention Of Plastic Microbeads And Microfibers In Goldfish 1 (Carassius Auratus), Stefan Grigorakis, Sherri A. Mason, Ken G. Drouillard
Great Lakes Institute for Environmental Research Publications
Microplastics are ubiquitous pollutants in aquatic habitats and commonly found in the gut contents of fish yet relatively little is known about the retention of these particles by fish. In this study, goldfish were fed a commercial fish food pellet amended with 50 particles of one of two microplastics types, microbeads and microfibers. Microbeads were obtained from a commercial facial cleanser while microfibers were obtained from washed synthetic textile. Following consumption of the amended pellet, fish were allowed to feed to satiation on non-amended food followed by fasting for periods ranging from 1.5 h to 6 days. Fish sacrificed at …
No Cortex, No Cry, Vladimir Dinets
No Cortex, No Cry, Vladimir Dinets
Animal Sentience
In his target article, Key (2016) argues that since fish don’t have a frontal cortex (part of the brain known to be important for feeling of pain in humans and rodents), they cannot feel pain or other noxious stimuli. I comment on the logic used in this extrapolation and other arguments presented in the paper.
Development Of Ecogeomorphological (Egm) Stream Design And Assessment Tools For The Piedmont Of Alabama, Usa, Brian Helms, Jason Zink, David Werneke, Tom Hess, Zan Price, Greg Jennings, Eve Brantley
Development Of Ecogeomorphological (Egm) Stream Design And Assessment Tools For The Piedmont Of Alabama, Usa, Brian Helms, Jason Zink, David Werneke, Tom Hess, Zan Price, Greg Jennings, Eve Brantley
Research, Publications & Creative Work
Regional data needed for effective stream restoration include hydraulic geometry relationships (i.e., regional curves) and reference channel morphology parameters. Increasingly ecological conditions are being considered when designing, implementing, and assessing restoration efforts. We provide morphology relationships and associated ecological endpoint curves for reference streams in the Alabama piedmont. Twenty-one reference stream reaches were identified in the Tallapoosa drainage of Alabama, ranging from 0.2 to 242 km2 drainage area. Geomorphic surveys were conducted in each stream to measure riffle cross-sections and longitudinal profiles and related to drainage area to develop regional curves. Fish, crayfish, and benthic macroinvertebrates were collected from each …
A Genetically Distinct Hybrid Zone Occurs For Two Globally Invasive Mosquito Fish Species With Striking Phenotypic Resemblance, Rebecca J. Wilk, Lisa Horth
A Genetically Distinct Hybrid Zone Occurs For Two Globally Invasive Mosquito Fish Species With Striking Phenotypic Resemblance, Rebecca J. Wilk, Lisa Horth
Biological Sciences Faculty Publications
Hybrid zones allow for the investigation of incipient speciation and related evolutionary processes of selection, gene flow, and migration. Interspecific dynamics, like competition, can impact the size, shape, and directional movement of species in hybrid zones. Hybrid zones contribute to a paradox for the biological species concept because interbreeding between species occurs while parental forms remain distinct. A long‐standing zone of intergradation or introgression exists for eastern and western mosquito fish (Gambusia holbrooki and G. affinis) around Mobile Bay, AL. The region has been studied episodically, over decades, making it perfect for addressing temporal dynamics and for providing …
A Missing Link In The Ionoregulatory Strategy Of Larval Sea Lamprey (Petromyzon Marinus) And African Lungfish (Protopterus Annectens): A Closer Look Into The Role Of The Non-Gastric H+/K+-Atpase, Justine E. Doherty
Theses and Dissertations (Comprehensive)
Fishes living in freshwater need to actively compensate for the diffusive loss of ions and osmotic gain of water. The gill is the primary organ of ion regulation and contains an array of ion transport proteins to help maintain homeostasis. Two of the more well studied ion pumps are the Na+/K+-ATPase (NKA) and vacuolar type proton ATPase (V-ATPase). This thesis focuses on another ion pump known as the non-gastric H+/K+-ATPase (ngHKA). The ngHKA (gene: atp12a) has not been found in any of the teleost fishes, indicating loss from that lineage. In …