TY - JOUR
T1 - The Surf Clam Beam Trawl Fishery and its Biological Management in Sendai Bay
AU - Sasaki, Koichi
PY - 1986
Y1 - 1986
N2 - Parameters of the Sakhalin surf clam Spisula sachalinensis stock in Sendai Bay were estimated by analyzing the fishery data to examine the management of fishery. The fishing has been greatly influenced by the fluctuation in recruitment, since the age structure has skewed to younger side. The average fishing mortality coefficient F and natural mortality coefficient M during 1980–84 were 0.6358±0.2735, and 0.5323±0.0915, respectively. The catchability coefficient q was 3.164 x 10-5. Since the natural mortality coefficient is high, we can expect higher yield per recruit from higher F and lower age of first capture. The most important problem in the management of the stock recruited intermittently by the strong year class, however, is to secure the minimum level of stock which could produce a lot of progeny if the circumstances might become favorable. Since it might be difficult to predict the recruitment from the stock-recruitment relationship, two models were proposed to follow successive stock density. Optimum fishing mortality coefficient is presumed to be between 0.5 and 0.6, which would be able to hold the stock at a level enough to produce recruits under deteriorated conditions.
AB - Parameters of the Sakhalin surf clam Spisula sachalinensis stock in Sendai Bay were estimated by analyzing the fishery data to examine the management of fishery. The fishing has been greatly influenced by the fluctuation in recruitment, since the age structure has skewed to younger side. The average fishing mortality coefficient F and natural mortality coefficient M during 1980–84 were 0.6358±0.2735, and 0.5323±0.0915, respectively. The catchability coefficient q was 3.164 x 10-5. Since the natural mortality coefficient is high, we can expect higher yield per recruit from higher F and lower age of first capture. The most important problem in the management of the stock recruited intermittently by the strong year class, however, is to secure the minimum level of stock which could produce a lot of progeny if the circumstances might become favorable. Since it might be difficult to predict the recruitment from the stock-recruitment relationship, two models were proposed to follow successive stock density. Optimum fishing mortality coefficient is presumed to be between 0.5 and 0.6, which would be able to hold the stock at a level enough to produce recruits under deteriorated conditions.
UR - http://www.scopus.com/inward/record.url?scp=85008106415&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85008106415&partnerID=8YFLogxK
U2 - 10.2331/suisan.52.399
DO - 10.2331/suisan.52.399
M3 - Article
AN - SCOPUS:85008106415
VL - 52
SP - 399
EP - 409
JO - Nippon Suisan Gakkaishi
JF - Nippon Suisan Gakkaishi
SN - 0021-5392
IS - 3
ER -