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| 題 名 | Preliminary Study on Temporal Variation of Ichthyoplankton Density and Composition in the I-lan Bay, Taiwan=宜蘭灣浮游魚類密度及種類組成時間變異的初步研究 |
|---|---|
| 作 者 | 丘臺生; 張光瑢; | 書刊名 | 臺灣水產學會刊 |
| 卷 期 | 19:3 1992.09[民81.09] |
| 頁 次 | 頁155-164 |
| 分類號 | 439.2 |
| 關鍵詞 | 宜蘭灣; 時間; 浮游; 密度; 魚類; 種類; |
| 語 文 | 英文(English) |
| 中文摘要 | 在1991年間我們用RMI網在宜蘭灣進行調查，企圖瞭解該區浮游魚類群聚的密度及組成。我們共執行了四個航次，分別在時間上代表晚冬(1月)、初夏(5月)、及秋冬之交(9及10月)。初步研究結果顯示:魚卵之密度在年內分布為37-4,581 inds./1,000 m3，0.18-2.46g/1,000 m3及0.2-1.6cc/1,000 m3;浮游魚類為108-932inds./1,000 m3，0.60-1.61g/1,000 m3及1.7-6.9cc/1,000 m3，及浮游動物靈56.08-1781.13g/1,000 m3及384.9-699.8cc/1000 m3。時間上的變異趨勢顯示，魚卵、浮游魚類及浮游動物呈一致的關係。這一年內共採進了14,452尾浮游魚類;在晚冬、初夏及秋冬之交分別鑑定出49,23及140-153個種類。主要魚種出現在秋冬者為1) Benthosema pterotum (27.8%)，2) Hygophum proximum (19.1%)，3) Vinciguerria nimbaria (7.8%)，4) Ceratoscopelus warmingi (5.0%) 和5 5) Stomias nebulosus;在初夏出現者為 1) Decapterus sp. (31.1%)，2) priacanthus macracanthus (12.1%)，3) Parapercis sp. (7.7%)，4) Scomberomorus guttatus (4.5%)和5) Liza sp. (3.0%);及在秋冬之交出現者為1)B. pterotum (20.9%)，2) Diaphus pacificus (11.1%)，3) Mene maculata (3.7%)，4) Leiognathus rivulatus (3.2%)和5) Myctophum orientable (3.2%)。在夏季開始後，大抵以具有漁業價的沿岸魚種佔據宜蘭灣為棲所;在秋冬之交，主要魚種逐漸為中洋中表層的魚類所取代。歧異度及均勻度指數顯示夏季較低，反在秋冬之交較高。 |
| 英文摘要 | Ichthyoplankton in the I-lan Bay area was sampled using RMI net during 1991. The purpose of this study was to understand the temporal variation of ichthyoplankton assemblage. This preliminary report analyzed data from four cruises to represent the assemblages of early summer (May), autumn-winter boundary (September and October) and late winter (January), respectively. The densities of egg ranged from 37 to 4,581 inds./1,000 m3, 0.18-2.46g/1,000 m3 and 0.2-4.6 cc/1,000 m3 measured in number, weight and settlement volume, respectively; that of ichthyoplankton 108-932 inds./1,000 m3, 0.60-1.61g/1,000 m3 and 1.7-6.9 cc/1,000 m3, and that of zooplankton 56.08-178.13g/1,000 m3 and 384.9-699.8 cc/1,000 m3. The temporal trends of variation indicated by the density of egg, ichthyoplanton and zooplankton coincided each other. The highest densities occurred in early summer. A total of 14,452 ichthyoplankton have been caught and identified into 49,230 and 140-153 taxa for early summer, autumn-winter boundary and late winter respectively. Those dominate species occurred in water of I-lan Bay were1) Benthosema pterotum (27.8%),2) Hygophum proximum (19.7%),3) Vinciguerria nimbaria (7.8%),4) Ceratoscopelus warmingi (5.0%) and 5) Stomias nebulosus for late winter assemblage; 1) Decapterus sp. (31.1%), 2) Priacanthus macracanthus (12.1%), 3) Parapercis sp. (7.7%), 4) Scomberomorus guttatus (4.5%), and 5) Liza sp. (3.0%) for early summer; and 1) B. pterotum (20.9%), 2) Diaphus pacificus (11.1%), 3) mene maculata (3.7%), 4) Leiognathus rivulatus (3.2%) and 5) Myctophum orientale (3.2%) for autumn-winter boundary. In the summer period those larvae of commercial fishery stock constituted the major component of the ichthyoplankton assemblage. In the winter period, those dominace were replaced by offshore meso-pelagic fishes of no commercial concern. Temporal variations measured by Shannon-Wiener function indicated that although the most abundant taxa occurred in the early summer assemblage the diversity and evenness indices indicated a low among the four samples and the high indices was found in the autumn-winter boundary. |
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