| Budget Amount *help |
¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1988: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1986: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Research Abstract |
1. Larval and juvenile fishes were collected from Hakodate, Usujiri, Wakkanai, Kushiro, Nemuro etc., in Hokkaido by the fish luring light at night. They were continuously collected at Usujiri and Hakodate thoughout the year, but collected seasonally in other places, especially after spawning season. Off shore collections were also made around Hokkaido and off Sanriku District by T.S. Oshoro Maru and T.S. Hokusei Maru, using larval nets. Artificial fertilization was made in some species. Larval individuals of some other species were reared to obtain specimens in more developed stages.
2. A great many specimens of larval and juvenile stages were collected and identified. They belong to 11 orders 46 families 100 genera and 127 species. In addition, 26 morphotypes could not be identified, which means that the taxonomic information is still poor in their identification.
3. Among the reared species, some such as Pseudalectrias tarasovi, Hexagrammos otakii etc., were successful to obtain various developmental series and the very detailed morphological change during development could be clarified. Very young stages could be obtained through the artificial fertilization in such species as Hexagrammos agrammus, H. octogrammus, etc.
4. Though the distribution and development of the melanophore are important in identification of the larval and juvenile fishes, the xanthophore and erythrophore, which disappear immediately after preservation, were also examined to get a new information of their taxonomy.
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