中文摘要

綜合1997年3月至1999年12月期間於高雄及小琉球附近海域採得樣本的分析結果，共發現浮游性仔稚魚75科119屬182種，其中以1公尺網行表層拖網部份共計42科72屬93種；而多層網部份則發現41科48屬73種。採集樣本中日本鯷(Engraulis japonicus)為最優勢的種類，且全年皆有出現的記錄，其它的種類則包括了沿岸小型魚種(如天竺鯛科及雀鯛科)、沿岸洄游魚種(如鯖科)、大洋性表層魚種(如鯷科)、大洋中表層性魚種(如燈籠魚科)、河口域仔稚魚種(如鰕虎科及鰺科)及小型底棲性魚種(如沙鮻 科及合齒科)等。而大鵬
灣內僅發現2科3屬3種，皆為小型的底棲種類。
高雄及小琉球附近海域由於受陸源水及高屏海底峽谷地形的影響，水文環境較為複雜，仔稚魚相也較為豐富，種類組成及豐度在季節間的變化較大；相對的，大鵬灣內由於為半封閉的水域環境，
且常年受人為的污染影響，水文環境變化不大，因而仔稚魚的種類組成較為單純且季節性的變化較不明顯。
整體看來，高雄及小琉球附近海域浮游性仔稚魚的豐度以6月份(濕季時)為最高，平均豐度為108±116 ind./100m3。而2月份時E. japonicus在小琉球附近的測站大量出現，推測1~2月應為該海域E. japonicus的繁殖季節，而其他幾種優勢種亦有明顯季節性消長的現象；另外，在高雄第一港口外以及高屏溪口外的測站1、4、5、6 仔稚魚豐度有較高的情形。而在日夜垂直分布方面，小琉球附近海域浮游性仔稚魚日、夜間的豐度變化並不明顯；除了少數種類以外，
大多數種類日間及夜間的分布皆以100米以淺水層為主。

Abstract:

There were 75 families, 119 genera and 182 species of ichthyoplankton found in the adjacent areas of Kaohsiung and Liuchiu Yu Island. Fifty families, 82 genera and 111 species were collected in the surface waters, and 37 families, 54 genera and 68 species were collected in oblique tows to 100m with an open 1 m net, while 41 families, 48 genera and 73 species were collected by a multiple opening-closing net. Engraulis japonicus was the most dominant species, and was found all year round; other dominant species included coastal fish species (Apogonidae and Pomacentridae), anadromous species (Scombridae), oceanic species (Engraulidae and Myctophidae), and demersal species (Gobiidae). There were only 3 species of ichthyoplankton belonging to 3 genera and 2 families found in the Tapong Bay, all these species are benthic species.
The coastal waters of Kaohsiung and Liuchiu Yu Island might be influenced both by the river and the topography of Kaping Trench, and thus the hydrological conditions of this area were more complex, and the ichthyoplankton was more diverse. On the other hand, the hydrological conditions of the semi-closed Tapong Bay changed less than that of the estuary of Kaoping river, thus the species composition of larval fish was simple and less diverse.
Overall, the highest abundance of the ichthyoplankton in the adjacent areas of Kaohsiung and Liuchiu Yu Island was found in the wet season(June), with an average of 108± 116 ind./100 m3. E. japonicus was the most abundant in February, revealed that might be the breeding season of this species. Other dominant species (eg. Bregmaceros japonica and Tridentiger sp.) also showed significant seasonal variation. Higher abundance of ichthyoplankton was usually found in the entrance of Kaohsiung first harbor(St.1) and the estuary of Kaoping river(ie. St.4~6). No significant diel vertical migration of the ichthyoplankton was observed in this study. Most ichthyoplankton were found in the water column above 100 m during both day and night.

目錄
章次…………………………………………………………………頁數
前言…………………………………………………………………. 1
材料與方法…………………………………………………………. 5
結果…………………………………………………………………. 10
討論…………………………………………………………………. 20
參考文獻……………………………………………………………. 29
附表…………………………………………………………………. 35
附圖…………………………………………………………………. 56
附錄…………………………………………………………………. 86

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