アンコウウバウオの生活史

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書誌事項

タイトル別名
  • アンコウウバウオ ノ セイカツシ
  • The Life History of the Clingfish, Conidens laticephalus

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説明

The clingfish, Conidens laticephalus (TANAKA), attaining to 40mm in adult size, had been caught in the middle and southern Japan and the northern Taiwan. The authors newly collected 14 adults, ranging 29.9 to 43.2mm in total length, from tide pools and shallow water on the coast of Nomozaki near Nagasaki (Lat. 32° 35.3'N, Long. 129° 45.5'E). In the habitat the fish concealed itself and clinged upsidedown under stones laying at the bottom, and it fed on gammarus and creeping copepods. Four egg masses were collected from the tide pools on June 24 and July 12, 1971. Each egg mass was attached to the under side of a stone and guarded by a male parent clinging near the egg mass. The eggs were rather dense in one layer accounting for 77, 77, 100 and 109 in four cases, but mature ovarian eggs numbered 108 to 161 in four females, ranging from 29.6 to 32.1mm in total length. Nine adults consisting of four females and five males were kept in a glass aquarium for spawning experiment during the period from June 24 to September 26, 1971. The fish deposited egg masses nine times on the under side of the stones set at the aquarium bottom at the interval of 2 to 13 days. The egg masses were deposited in one layer as seen in the natural spawnings, but the number of the eggs in each mass varies from 11 to 148. In three of the nine egg masses spawned in the aquarium, all eggs are unfertilized. The egg is flat ellipsoid in shape, being 1.28 to 1.38mm in long axis and 1.02 to 1.13mm in short axis, and it is provided with an adhesive pedestal at the bottom side and translucent oil globules contained in the yolk colored light greenish orange. The embryo in the advanced stage instantly changed its position in the egg membrane. Some of the newly hatched larvae, being 3.45 mm in total length, were reared for 14 days in a 30l plastic aquarium and they were fed with the rotifers and nauplii of brine shrimp before they entered into the early stage of bottom life. The ventral disc appeared as a rudiment in 4.47mm postlarva in the planktonic life and it was almost completed in 6.27mm juvenile in the early clinging life. The planktonic larvae, being 4 to 6mm in total length, of the four Japanese clingfishes, Conidepis laiiccpholus, Asprzsmichthys ciconiae, Leparlichthys frenatirs and Aspasma minima are easily distinguished from each other by the differences appearing in melanophore disposition and myomere number.

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