タナゴ類属間雑種の性と不妊性

概要

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1) Almost all hybrids produced artificially from Rhodeus ocellatus ?? × Acheilognathus tabira ??, Rhodeus ocellatus ?? × Acheilognathus limbata ??, Rhodeus ocellatus ?? × Acheilognathus cyanostigma ??, Rhodeus ocellatus ?? × Acheilognathus lanceolata ?? and Acheilognathus lanceolata ?? × Rhodeus ocellatus ?? are male. Only few hybrid females from Rhodeus ocellatus ?? × Acheilognathus lanceolata ?? and Rhodeus ocellatus ?? × Acheilognathus cyanostigma ?? can be reared to adult size, while their ovaries are not developed. 2) Hybrid males display the spawning behavior to the control female or hybrid female, though the behavior is not intensive as in the case of the control and the oviposition does not occur. 3) The testes of many hybrids are nearly normal in external form, but in some hybrids they are shrunken or entirely absent. None of the spermatozoa is observed in hybrid testes.