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Full-Text Articles in Aquaculture and Fisheries
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) …