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Articles 1 - 18 of 18
Full-Text Articles in Aquaculture and Fisheries
Preface, Kohji Iida, Ming-An Lee, Masahiko Furusawa
Preface, Kohji Iida, Ming-An Lee, Masahiko Furusawa
Journal of Marine Science and Technology
No abstract provided.
Analysis Of The Me70 Multibeam Echosounder Data In Echoview??Urrent Capability And Future Directions, Myounghee Kang
Analysis Of The Me70 Multibeam Echosounder Data In Echoview??Urrent Capability And Future Directions, Myounghee Kang
Journal of Marine Science and Technology
The general features of the multibeam echosounder (Simrad, ME70) are covered and trends in recent research on using the sonar systems are stated. Echoview's current capability for analyzing ME70 data is precisely described in two categories: split beam data analysis and multibeam data analysis. In particular, the visualization and analysis of school in three dimensions and school tracking are illustrated using fish school echoes observed in Bering Sea during the summer of 2008 and 2009. Future software developments in Echoview may include: high resolution bathymetric algorithms to detect reliable sea bottom, advanced school detection in three dimensions even for ambiguous …
Technology Evolution And Advances In Fisheries Acoustics, Dezhang Chu
Technology Evolution And Advances In Fisheries Acoustics, Dezhang Chu
Journal of Marine Science and Technology
Application of sonar technology to fisheries acoustics has made significant advances over recent decades. The echosounder systems evolved from the simple analog single-beam and single-frequency systems to more sophisticated digital multi-beam and multi-frequency systems. In this paper, a brief review of major technological advances in fisheries acoustics is given, as well as examples of their applications.
Diel Distribution And Movement Of Sound Scattering Layer In Kuroshio Waters, Northeastern Taiwan, Ming-An Lee, Ming-Hsiu Chao, Jinn-Shing Weng, Yang-Chi Lan, Hsueh-Jung Lu
Diel Distribution And Movement Of Sound Scattering Layer In Kuroshio Waters, Northeastern Taiwan, Ming-An Lee, Ming-Hsiu Chao, Jinn-Shing Weng, Yang-Chi Lan, Hsueh-Jung Lu
Journal of Marine Science and Technology
A 26-hr acoustic observation was carried out on board of the “Ocean Research II” in the Kuroshio waters at 123°09.027'E, 25°05.019'N from August 4 to 5, 2007. Acoustic volume scattering strengths (SVs) were collected by a scientific echo sounder (EK500, 38 kHz) and diel variations of sound scattering layer were analyzed. The maximum SV of surface scattering layers (SSL) around 20~80 m was observed after dawn, and mean SVs of SSL in nighttime was about -68 dB, 8 dB higher than that of daytime. Two deep scattering layers (DSL) were found in daytime at depth of 400~500 m and 600~700 …
Echo Integration Near The Seabed, Masahiko Furusawa
Echo Integration Near The Seabed, Masahiko Furusawa
Journal of Marine Science and Technology
The echo integration (EI) method has long been used for fish abundance estimations. The method is applicable to any type of fish distribution and the analysis is easy to perform by advanced software. For fish near the seabed, however, sometimes it is difficult to perform an analysis because of so-called dead zones. In this paper, the EI near the seabed is considered, reviewing past studies and introducing some new ideas such as an unsampled zone. For the consideration, close inspection of the EI theory is necessary and a section is devoted to the purpose. As an application of the EI …
Fish Acoustics: Physics-Based Modeling And Measurement, Davis Benjamin Reeder
Fish Acoustics: Physics-Based Modeling And Measurement, Davis Benjamin Reeder
Journal of Marine Science and Technology
The U.S. Office of Naval Research has sponsored research in the area of marine organism acoustics for many years. The research program has included development of theoretical physics-based acoustic scattering models of single animals, high-resolution laboratory measurements of scattering by individual animals, and at-sea field experiments. The program has been focused on the backscattered signal, but has also included investigation of the forward-scattered signal. Downward-looking acoustic surveys using ship borne echosounders rely on the backscattered signal and provide non-invasive, non-destructive, rapid, high-resolution, large area survey capability compared to traditional net tows. Horizontally-oriented acoustic surveys provide the opportunity to investigate both …
Vertical Distribution Of Walleye Pollock Juveniles Before And After The Period Of Transition For Feeding In Funka Bay, Hokkaido, Japan, Yohei Kawauchi, Osamu Shida, Hiroya Okumura, Naoki Tojo, Hiroki Yasuma, Kazushi Miyashita
Vertical Distribution Of Walleye Pollock Juveniles Before And After The Period Of Transition For Feeding In Funka Bay, Hokkaido, Japan, Yohei Kawauchi, Osamu Shida, Hiroya Okumura, Naoki Tojo, Hiroki Yasuma, Kazushi Miyashita
Journal of Marine Science and Technology
We examined the vertical distributions of walleye pollock Theragra chalcogramma juveniles for two size groups (smaller and larger than 30 mm) during the period of transition for feeding (PTF) and after this period in Funka Bay, Hokkaido, Japan. Samplings were conducted in May and June in 2006 and 2007, and water temperature and salinity were measured. The correlation between juvenile sizes and distributed depth was observed using net sampling. From this result, size groups were divided by depth. In addition, the distribution and abundance of juveniles were examined using acoustic data. In the PTF (May), juvenile size increased with increasing …
In Situ And Ex Situ Target Strength Measurement Of Mesopelagic Lanternfish, Diaphus Theta (Family Myctophidae), Kouichi Sawada, Kazuhisa Uchikawa, Tomohiko Matsuura, Hiroya Sugisaki, Kazuo Amakasu, Koki Abe
In Situ And Ex Situ Target Strength Measurement Of Mesopelagic Lanternfish, Diaphus Theta (Family Myctophidae), Kouichi Sawada, Kazuhisa Uchikawa, Tomohiko Matsuura, Hiroya Sugisaki, Kazuo Amakasu, Koki Abe
Journal of Marine Science and Technology
Acoustic target strengths (TS) of myctophid fish Diaphus theta were measured in situ at 70 kHz off the east coast of Hokkaido by tethering an acoustic-optical system (the Japanese Quantitative Echosounder and Stereo-video Camera System or J-QUESTχ) at a depth of 150 m from a research vessel. Fish length distributions were obtained from daytime hauls taken with a frame trawl after the TS measurement. Measured average TS () and a standard length (SL) in cm gave the empirical length - average TS relationship, = 20logSL70.6, assuming that the linear TS is proportional to the square of the SL. A laboratory …
Effect Of Depth-Dependent Target Strength On Biomass Estimation Of Japanese Anchovy, Hiroto Murase, Atsushi Kawabata, Hiroshi Kubota, Masayasu Nakagami, Kazuo Amakasu, Koki Abe, Kazushi Miyashita, Yoshioki Oozeki
Effect Of Depth-Dependent Target Strength On Biomass Estimation Of Japanese Anchovy, Hiroto Murase, Atsushi Kawabata, Hiroshi Kubota, Masayasu Nakagami, Kazuo Amakasu, Koki Abe, Kazushi Miyashita, Yoshioki Oozeki
Journal of Marine Science and Technology
Effect of the depth-dependent target strength (TS) on biomass estimation of Japanese ahcovy was examined by using following four TS models: (1) TS = 20logLt-71.9, (2) TS = 20logLt-72.5, (3) TS = 20logLt-(20/3)log(1+z/10)-67.6 and (4) TS = 20logLt-(20/3)log(1+z/10)-64.7, where Lt and z represent total length (cm) and depth (m), respectively. (1) and (2) have been used in conventional fisheries resources surveys; (3) and (4) take account of depth-dependent TS. Because (1)-(3) were based on in-situ measurement, pitch angles of individuals used in the models were not known. Pitch angle is assumed 0° (±10° std) in (4). Biomass estimated by (3) …
Measurement And Modeling Of Three Dimensional Target Strength Of Fish For Horizontal Scanning Sonar, Muhammad Kurnia, Kohji Iida, Tohru Mukai
Measurement And Modeling Of Three Dimensional Target Strength Of Fish For Horizontal Scanning Sonar, Muhammad Kurnia, Kohji Iida, Tohru Mukai
Journal of Marine Science and Technology
This paper discusses the three-dimensional target strength (3DTS) of fish for a horizontal scanning sonar. Experiments were conducted in a tank using a defrosted Japanese mackerel. Measurements were made by changing the horizontal incident angle of a 50 kHz acoustic beam and the pitch angle of a tethered fish. Following the experiment, morphological characteristics, including the swimbladder size and shape, were measured using soft X-ray and digitized. The theoretical 3DTS was estimated using the prolate spheroid model and compared with the measured 3DTS. Results showed that the TS strongly depended on the fish orientation. The maximum and minimum TS were …
Spatial Estimation Of Euphausiid Biomass Along The Pacific Coast Of Eastern Hokkaido, Japan In Early Summer Of 2008, Naoki Tojo, Kenji Minami, Ryuichi Matsukura, Yohei Kawauchi, Tetsuichiro Funamoto, Masayuki Chimura, Akira Nishimura, Kazushi Miyashita
Spatial Estimation Of Euphausiid Biomass Along The Pacific Coast Of Eastern Hokkaido, Japan In Early Summer Of 2008, Naoki Tojo, Kenji Minami, Ryuichi Matsukura, Yohei Kawauchi, Tetsuichiro Funamoto, Masayuki Chimura, Akira Nishimura, Kazushi Miyashita
Journal of Marine Science and Technology
This study focused on euphausiid distribution and biomass estimation over the coastal shelf of the Pacific coast of Hokkaido Japan in early summer 2008. Acoustic data were obtained in both day (6:00-18:00) and night (18:00-6:00) using a quantitative echosounder (EK60, Simrad) with two frequencies (120 and 38 kHz). Echoes of euphausiids were specified based on the ΔMVBS, calculated with seasonal theoretical target strength of Euphausia pacifica. The best-fit kriging models were used to quantitatively interpolate euphausiid distribution. The detected euphausiid biomass reached 38,278 t (> 15 gWWm-2), suggesting abundant prey for large fishes over study area. On the other hand, …
An Alignment Approach To Identify Fish With Encoding Hydroacoustic Signal To Acoustics Alphabet Squences, Shih-Yen Ku, Hsueh-Jung Lu, Chi-Ting Tseng, Ker-Chau Li, Long-Jin Wu
An Alignment Approach To Identify Fish With Encoding Hydroacoustic Signal To Acoustics Alphabet Squences, Shih-Yen Ku, Hsueh-Jung Lu, Chi-Ting Tseng, Ker-Chau Li, Long-Jin Wu
Journal of Marine Science and Technology
1D sequence homologous alignment tool, like FastA (FASTALL) [8] or BLAST (Basic Local Alignment Search Tool) [1], has been widely used in bioinformatics field and perform elegant and fast searching for the sequences developed from the same kinds of species. In other word, it can classify through determining the homologous similarity which is not totally similar in sequences of protein sequences, structure or nucleotide sequences. An approach is proposed in this paper called AA-FAST (abbreviation for Acoustics Alphabet-FAST) which takes advantage of alignment tool and significant sequence encoding method. In this experiment, it could not only determine 4 fish species …
Section Abstracts: Agriculture, Forestry And Aquaculture Science
Section Abstracts: Agriculture, Forestry And Aquaculture Science
Virginia Journal of Science
Abstracts of the Agriculture, Forestry, and Aquaculture Sciences section for the Virginia Academy of Science 89th Annual Meeting, May 25-27, 2011, University of Richmond, Richmond, Virginia.
Neuroprotective Effects Of The Lipidic Extract From Integument Of Squid Dosidicus Gigas, Pai-An Hwang, Yi-Gung Tsai, Shu-Yun Gau, Yu-Lan Hung, Chi-Chung Fan
Neuroprotective Effects Of The Lipidic Extract From Integument Of Squid Dosidicus Gigas, Pai-An Hwang, Yi-Gung Tsai, Shu-Yun Gau, Yu-Lan Hung, Chi-Chung Fan
Journal of Marine Science and Technology
The integument of the squid Dosidicus gigas is an industrial waste and trouble the industrial processing. In this study, we examined the lipid composition and neuroprotective effects of D. gigas integument lipidic extract (DGI) in SH-SY5Y neuroblastoma cells which have been exposed to H2O2. The results showed that phospholipids, triacylglycerol and cholesterol accounted for 70.90 ± 4.96 (mean ± S.D.), 20.70 ± 3.54 and 8.40 ± 0.28% of DGI, respectively. And the main fatty acids were docosahexaenoic acid (30.53% of total fatty acid), palmitic acid (20.36% of total fatty acid) and eicosapentaenoic acid (11.84% of total fatty acid). DGI at …
Toward A Working- Waterfront Ethic: Preserving Access To Maine’S Coastal Economy, Heritage, And Local Seafood, Robert Snyder
Toward A Working- Waterfront Ethic: Preserving Access To Maine’S Coastal Economy, Heritage, And Local Seafood, Robert Snyder
Maine Policy Review
Maine has one of the most beautiful coastlines in the world, one for which people are willing to pay a premium. But for Maine fisherman, the coast is how they access their livelihood. In 2002 only 25 miles of Maine’s 5,300-mile coastline supported working-waterfront access. This article discusses creative and innovative strategies to preserve Maine’s working waterfront, including current-use taxation, purchase of development rights, and community-supported fisheries (CSF).
Building A Sustainable Seafood System For Maine, Robin Alden
Building A Sustainable Seafood System For Maine, Robin Alden
Maine Policy Review
In this article, Robin Alden notes that Maine could have one of the premier marine food systems in the world. However, that means adequate stewardship of the Gulf of Maine ecosystem and diversifying the fishing industry beyond lobster by creating innovative public policy and a food system that supports community fishing.
By Land And By Sea, Amanda Beal
By Land And By Sea, Amanda Beal
Maine Policy Review
This short article discusses the results of the By Land and By Sea project, in which Maine fishermen and farmers came together to discuss common concerns and to forge new solutions aimed at re-envisioning a unified food system.
Adrift In A Sea Of Information About Sustainable Seafood: The Maine Consumer Perspective, Catherine V. Schmitt
Adrift In A Sea Of Information About Sustainable Seafood: The Maine Consumer Perspective, Catherine V. Schmitt
Maine Policy Review
The desire for a sustainable seafood industry that protects the environment and the future of fishing is certainly of interest to consumers, but even here there are conflicting standards, as Catherine Schmitt explores in this article.