The Composition,Abundance,And Assemblages of Neustonic Fish Larva along a Transect off Eastern Taiwan in January,1992

臺灣東部海域中沿一斷面之表層仔稚魚魚種組成,豐度及群聚

葉信平(Shinn-Pyng Yeh)

《臺灣水產學會刊》 20卷1期 (1993/03) Pp. 15-26

https://doi.org/10.29822/JFST.199303.0002

摘要

爲開發與評估臺灣周邊水域之中上層洄游性魚羣，採用中層拖網漁捕的可行性，期達漁業資源之有效利用爲目的。本試驗利用海研一號(Ocean Researcher Ⅰ)試驗船之掃瞄裝置。採用中層拖網具，在臺灣東北海域進行魚羣在網口之反應行爲觀察以外，並實施影響中層網具曳行水深變動的參數調查試驗，以資爲監控網具運動提供基礎資料。初步試驗結果摘要如下：(1)網口之中央高度（Y1）與拖曳速度（X1）和曳綱長度（X2）可用複廻歸方程式Y1=31.1-3.095·X1-0.069·X2表示。由此得知網口高度的變化主要是受拖曳速度的影響。(2)網具之深度位置（Y2）隨曳綱長度（X2）的增加而變深；隨拖曳速度（X1）之增加而變淺。複廻歸方程式爲Y2=43.257-9.882·X1+0.181·X2。(3)聚集於網口中央之魚羣，大部分與網口保持一定之距離並與網具作同向運動；部分則有穿越逃逸之反應行動。(4)在網口集中之魚羣，經多少時間始進入網內或逃出之追蹤觀察，有待裝備之進一步研發與研討。

關鍵字

仔稚魚 ； 魚種組成 ； 豐度 ； 群聚 ； 臺灣東部海域

並列摘要

To develop and elevate the practical fishing efficiency of the midwater trawlused in the waters off northern Taiwan,it is essential not only to learn howfishes react to net?but to learn how to control the geometry of the net-mouthand target fish schools.This study was carried out in purse seine fishing grounds using a trawlingnet with the optimized scanning net-sonde sonar during 1991.The study results are summarized below:(1)The relationship of the height of net mouth(Y1)to the towing speed(X1)and the warp length(X2)is represented as Y1=31.1-3.095·X1-0.069·X2.Theheight of net mouth is mainly affected by the towing speed.(2)The vertical depth of net(Y2)increases in proportion to the increase ofwarp length,whereas the vertical depth of net decreases in proportionto the increase of towing speed.The regression function is Y2=43.257-9.882·X1+0.181·X2.(3)Fish schools gathered in the center of net mouth and kept constant swimmingdistance to the net mouth with the movement of net.(4)A way to improve the fishing efficiency of the midwater trawl is furtherto develop the design and operation of the hydroacoustic equipment andfishing gear.

並列關鍵字

Fish Larva ； Composition ； Abundance ； Assemblages ； Eastern Taiwan