Mash Selectivity of Unmarketable Trash Fish by a Small Trawl Fishery in the Seto Inland Sea.
Mash Selectivity of Unmarketable Trash Fish by a Small Trawl Fishery in the Seto Inland Sea.
复制标题
濑户内海小拖网渔业对滞销杂鱼的混炼选择性。
DOI：
10.2331/suisan.60.347
复制
发表时间：
1994
影响因子：
0.4
通讯作者：
K. Matuda
中科院分区：
文献类型：
--
作者：
T. Tokai;S. Omoto;K. Matuda
本文描述了作为减少副渔获物的一种手段的对滞销鱼的网目选择性曲线。用6种网目尺寸的虾梁拖网，对鳀、线纹天竺鲷、细颌鱼、细棘虎鱼、隐棘虎鱼和瓦氏虾虎鱼6种主要的非市场鱼类进行了网片选择性试验。本文采用东海和北原确定网格选择性曲线的方法的修改版本。在这种改进的方法中，网格选择性由G/P的函数来近似，其中G和P分别是体围和网格周长。网选择性的主曲线被确定为一个逻辑函数的最大似然法为六个滞销的鱼类品种。如果将网囊的网目尺寸从该地区常用的20.6mm增加到24.9mm，这些滞销鱼类的渔获量将从53.4%减少到16.7%，而不会减少主要目标物种，小虾，南方粗虾Trachypenaeus curvirostris。这也节省了分拣可用鱼所需的劳动力。
This paper describes mesh selectivity curves of unmarketable fish as a means of decreasing by-catch. For six main unmarketable fish species, Engraulis japonicus, Apogon lineatus, Leiognathus rivulatus, Acentrogobius pflaumii, Cryptocentrus filifer, and Repomucenus valenciennei, mesh selectivities are ob-tained from a covered-net fishing experiment using a shrimp beam trawl with codends of six mesh sizes. This paper uses a modified version of Tokai and Kitahara's method of determining the mesh selectivity curve. In this modified method, mesh selectivity is approximated by a function of G/P, where G and P are body girth and mesh perimeter, respectively. The master curves of mesh selectivity are determined as a logistic function by the maximum likelihood method for the six unmarketable fish species. If the mesh size of the codend is increased from 20.6mm commonly used in this area to 24.9mm, the catch numbers of these unmarketable fish are reduced from 53.4% to 16.7% without reducing the catch of the main target species, small shrimps, e.g., southern rough shrimp Trachypenaeus curvirostris. This also saves the labor required to sort usable fish.