沖縄島に生息する中卵型ヨシノボリ２種の卵内発生および仔稚魚の成長に伴う形態変化
書誌事項
- タイトル別名
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- Embryonic development and morphological changes in larvae and juveniles of two land-locked gobies, Rhinogobius spp. (Gobiidae), on Okinawa Island.
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説明
Members of the genus Rhinogobius are widely distributed in Far East Asia, at least 11 species having been recognized in Japan. Of the six species recorded from Okinawa Island, two are land-locked (“aobara-yoshinobori” R. sp.BB and “kibara-yoshinobori” R. sp.YB) and the remainder amphidromous. Embryonic development and morphological changes in the two land-locked species are described from artifically-reared eggs, larvae and juveniles. Survival and growth of the two species were compared under different salinities (0-35%0) dur-ing a 21-day period following hatching. Although egg diameters of both species were almost the same (“aobara-yoshinobori”; 4.3±0.1 mm, “kibara-yoshinobori”; 4.3±0.2 mm), newly-hatched larval morphology, and larval and juvenile salinity tolerance clearly differed. Newly-hatched larvae of “aobara-yoshinobori” had a flexed notochord and caudal fin rays already developed. The yolk was completely consumed 3 days after hatching. By comparison, “kibara-yoshinobori” hatched at an ealier developmental stage, having a straight notochord. The yolk disappeared 7 days after hatching. Larvae and juveniles of “aobara-yoshinobori” were less toler-ant in high salinity than those of “kibara-yoshinobori”. The results suggested that the two land-locked gobies have become adapted to a wholly fluvial life cycle, through somewhat different strategies.
収録刊行物
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- 魚類学雑誌
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魚類学雑誌 47 (1), 29-41, 2000
The Ichthyological Society of Japan
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詳細情報 詳細情報について
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- CRID
- 1390001204766314496
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- NII論文ID
- 130003826519
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- ISSN
- 18847374
- 00215090
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可