Effects of Eyestalk Ablation on Maturation, Spawning, Hatching, Molting and Growth of Precocious Pond Reared Penaeus monodon.

DOI JASI 1 Citations 14 References
  • MAKINOUCHI Sadaharu
    <I>Overseas Fishery Cooperation Foundation</I>
  • SUGAMA Ketut
    <I>Research Insititute for Coastal Aquaculture of indonesia</I>
  • RUCHIMAT Toni
    <I>Research Insititute for Coastal Aquaculture of indonesia</I>
  • TRIDJOKO
    <I>Research Insititute for Coastal Aquaculture of indonesia</I>
  • SUTARMAT Tatam
    <I>Research Insititute for Coastal Aquaculture of indonesia</I>
  • LANTE Samuel
    <I>Research Insititute for Coastal Aquaculture of indonesia</I>

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  • 早熟系池産ウシエビの成熟, 産卵, 孵化, 脱皮および成長率に及ぼす眼柄切除の影響

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Abstract

The effects of eyestalk ablatin on maturation, spawning, hatching, molting, and growth of the precocious pond-reared broodstocks ( (1) 4 month-old, (2) 5 month-old, (3) 1 year-old) and (4) wild spawner P. monodon were investigated for cost reduction and facilitate the broodstock operation.<BR>In group (1), there was significant difference (p<0.05) in the progress of ovarian maturation between ablated (GSI 0.59±0.22) and unablated females (GSI 0.33±0.12) after 35 days culture period. In group (2), it was observed that the minimum size at first ovarian maturation was 36g (BW) in ablated and 44g in unablated females. The minimum age or size at first spawning of female was observed in an ablated individual 5-month-old; weighting 38g. This individual fully matured and spawned two times 30 and 33 days after ablation (300, 000 total eggs/prawn) . The results suggested that it is possible to use precocious pond broodstock as a spawner.<BR>On the other hand, in group (3), 50 % of unablated females matured and spawned 1-3 times between 4-16 days after the onset of the experiment (534, 000 total eggs/prawn) . In group (4), 43% of unablated females fully matured and spawned 1-3 times between 5-10 days after the onset of the experiment. They produced 2.2 million eggs and 1.2 million nauplii; mean hatching rate 63.1±13%. In contrast, 86% of the ablated females spawned at a rate of 4-7 times/spawner/month, but the hatching rate was only 19.4 ±17 %. From these results, it can be conclused that ablation increase maturation and spawning rates, however, unablated females show more higher fecundity, hatching, and survival rates. Furthermore, unablated females showed 2-10 times faster growth rate and shorter molt-cycle than that of ablated females.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (1), 103-108, 1995

    Japanese Society for Aquaculture Science

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