• 作者： 丘臺生; 張光瑢
• 作者服務機構： 國立台灣大學動物系
• 中文摘要： 本研究在宜蘭灣南北選取兩條由近岸向遠岸的探測線，進行浮游魚類探樣，以明瞭不同深度、不同水層浮游魚類的密度及豐度情形。 這個研究結果顯示：浮游魚類在較接近岸處之密度較高，而且這個趨勢與浮游動物之趨勢相同。過去二年內共進行8次全面性採樣，採得19,124尾仔稚魚，主要種為：Decapterus spp. (19.2%), Benthosema pterotum (9.5), Priacanthus macracanthus (7.4%), gobiid (4.6%), Parapercis sp. (4.0%), Diaphus pacificus (3.6%), Scomberomo-rus guttatus (3.5%), Mene maculata (2.6%), Auxis spp. (2.3%), Liza sp. (2.3%), Decapterus macarellus (1.1%), 及Ceratoscopelus warmingi (1.0%)。魚類組成顯示有南北之差異，但水層間、深度間有關聯存在，此關係在鄰近的採樣分級尤其明顯。
• 英文摘要： The spatial variation of density and assemblage composition of ichthyoplankton in the I-Ian bayarea were investigated by sampling two transect lines running in the inshore-offshore direction during Oct.1990-July 1992. On each transect line, three stations at bottom depths of 50, 100 and 200 m were selected.At each station, three water columns from the surface, midwater (half way to the bottom) and bottomwere sampled using a non-closing ichthyoplankton net. Eighteen categories (two transects X three bottomdepths X three water columns) of ichthyoplankton composition were analyzed. The greatest density of ichthyoplankton was found at a shallow depth (50 m) in the bay and thegreatest density of zooplankton coincided with that of ichthyoplankton. In total，19,124 ichthyoplanktonwere sorted and identified, yielding 113 families. Most are rare (less than one percent). The major taxaare Decapterus spp. (19.2%, exclude D. macarellus), Benthosema pterotum (9.5%), Priacanthus macracan-thus (7.4%), gobiid (4.6%), Parapercis sp. (4.0%), Diaphus pacificus (3.6%), Scomberomorus guttatus(3.5%), Mene maculata (2.6%), Auxis spp.(2.3%), Liza sp. (2.3%), Decapterus macarellus (1.1%), andCeratoscopelus warmingi(1.0%). The comparisons made among 18 categories indicate that the assemblagesfrom north and south were uncorrelated, but series similarity was maintained among neighboring cate-gories of water column and bottom depth. Significant correlations were established among categories ofwater column and bottom depth.
• 中文關鍵字： depth distribution; ichthyoplankton; I-lan Bay
• 英文關鍵字： --