海産魚類の卵質および子魚の生残におよぼす要因解明に関する研究　ＩＩ　　マダイ自然産卵の形状

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  • Studies on the factors influencing on egg quality and larval survival of marine fish - II. Characteristics of naturally spawned eggs of red sea bream.
  • マダイ シゼン サンシュツラン ノ ケイジョウ

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In order to identify factors for the variations in egg quality by individual brood fish, egg samples taken from the lst Group (three-year olds in the 10-ton pond) and the 2nd Group (two-to twelve-year olds in the 4, 000m2 pond) were examined for their respective characteristics. In addition to normal eggs and dead eggs, three types of abnormal eggs were found among the samples; namely, (i) wrinkly eggs which developed wrinkles on the egg membrane, (ii) spotted eggs which developed minute black spots on the egg cortex, and (iii) plasma-bulged eggs which developed swellings of cortical ooplasma. The percentage of abnormal eggs was higher in the 2nd Group than the 1st. Moreover, the percentage varied greatly by individual brood fish, reaching well over 60% in some cases.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 51 (9), 1395-1399, 1985

    公益社団法人 日本水産学会

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