小田和湾の藻場におけるウミタナゴ類3種の個体数変動〔英文〕

概要

論文の詳細を見る
1) Population fluctuation of embiotocid fishes in Odawa Bay, Kanagawa Prefecture, was examined on the basis of data on catch per haul by the tow net (Gorota-ami) from 1974 to 1977. 2) The Zostera belt of Odawa Bay was divided into four areas and abundance indices for each species within each area and for the total area of the Zostera belt were calculated. 3) The range of estimates (between years) for the total mortality coefficient (Z), calculated from the estimated daily decrease in the natural logarithmic value of an abundance index of the 0+age population, is estimated at 0.010-0.028 in D. viridis, 0.009-0.033 in D. temmincki and 0.021-0.048 in N. ransonneti. 4) The reliability of the calculation of the abundance index is discussed in connection with various factors which may have effect on the estimate of Z.
日本水産學會の論文