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Full-Text Articles in Animal Sciences
Winter Abundance And Species Composition Of Anchovy Larvae Associated With Hydrological Conditions In The Coastal Waters Of Tanshui, Taiwan, Yi-Chen Wang, Wen-Yu Chen, Yu-Kai Chen, Yi-Chun Kuo, Ming-An Lee
Winter Abundance And Species Composition Of Anchovy Larvae Associated With Hydrological Conditions In The Coastal Waters Of Tanshui, Taiwan, Yi-Chen Wang, Wen-Yu Chen, Yu-Kai Chen, Yi-Chun Kuo, Ming-An Lee
Journal of Marine Science and Technology
The present study investigated changes in the winter abundance and composition of anchovy larvae associated with hydrological conditions in the coastal waters of Tanshui, Taiwan. A survey during the period of 2008-2014 revealed that the abundance of larvae caught using fyke nets varied from 123.9 to 28,314 ind/1000 m3 , whereas the surface water temperature and salinity ranged from approximately 17C to 18C and 32.84 psu to 33.72 psu, respectively. Engraulis japonicus (Japanese anchovy), Encrasicholina punctifer (buccaneer anchovy), and E. heteroloba (shorthead anchovy) were the dominant species of anchovy larvae, accounting for 0.17%-93.56%. In the La Niña years 2008 and …
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) …