Some Aspects on the Fishery Biology of Big Eye Priacanthus Macracanthus in the Tungkang Waters,Southwestern Taiwan

Abstract

本文報導臺灣西北部淡水河口64種以不同漁具採自三個地點之魚類。其中有13種係初級棲息種，51種則屬於次級棲息種。河口內緣以刺網捕獲之大型種以海鯰科（66.26％），鰏科（9.70％）及鯔科（9.51％）為主。小型魚以表層稚魚拖網捕獲者，依序以鯡科（34.71％），鮆科（21.02％）及鰺科（20.35％）為主。近竹圍之紅樹林區，係以手操網捕獲，雖未刻意定量化，但大致上看來係以彈塗魚為主。最外緣近沙崙處，以底定置袋網捕獲之魚類乡為幼魚，魚種組成以鯔科（56.02％）及花身鷄魚科（21.22％）為主。在此水域之主要魚種為海鯰及花身鷄魚，二者之豐度季節性變化之樣式均有一年不如一年之趨勢，可能與環境品質之惡化有關連。A total of 64 species were collected by different fishing gears from threelocations in the estuary of Tanshui River on north-western Taiwan,duringMay 1988 and April 1991.Thirteen gobiid species were primary residents whilethe remaining 51 species were secondary residents.In the inner part of theestuary,fishes of larger size including Ariidae(66.26％).Leiognathidae(9.70％)and Mugilidae(9.51％)dominated in the catches of gill net whereas thesmall-sized juveniles of Clupeidae(34.71％),Engraulidae(21.02％),Carangidae(20.35％)and Teraponidae(17.69％)dominated in the catches of surface larvaltrawl net.The fish in the mangrove marsh near Chuwei were dominated byBoleophthalmus pectinirostris though not quantified.On the outer margin ofestuary near Shalung where the entire catches by setted larval bag net belongto juveniles and postlarvae of Mugilidae(56.02％)and Terapon jarbua(21.22％)The seasonal abundance of Arius sp.and Terapon jarbua indicated similar trendthat their population size have declined year after year,resulted probablyfrom the environmental deterioration.