Effects of Different Male Situations on Maturation, Spawning, Mating and Hatchery Cost of Wild Penaeus monodon.
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概要
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In order to investigate the effects of male situations on maturation, spawning, mating and hatchery cost of <I>P. monodon</I>, six groups ( (1) first male, (2) second use male, (3) third use male, (4) ablated male, (5) pond male, (6) without male) were evaluated for a 31-day culture period, and replicated 8-63 times from 1987 to 1990.<BR>The average spawning rate and fecundity in six groups showed no significantly difference (p>0.05), ranging from 63-80 % and 1, 150, 000-1, 337, 000 eggs per spawner/month, respectively. The mating and hatching rates varied as follows; 83.1% (41.4%) in first male, 72.3% (38.2%) in second use male, 70.8% (40.9%) in ablated male, 64.8% (31.9%) in third use male and 21% (24.6%) in pond male, respectively. However, there was no significant difference among group (1) - (4) except pond male (P>0.05) . Hatchery cost for 1 million nauplii in five groups was little difference, ranging from M$27-37. It can be conclused that second-or third-use male could be utilized more for reduced cost and to facilitate hatchery management.<BR>Full ovarian maturation and spawning was attained 3-4 days after abration with a first peak at 5-6 days, and that a second peak occurred between 18-20 days. Spawning frequency was 25.5% at first, 28.3% at second, 26.1% at third, 13.9% at fourth, 5.6% at fifth and 0.4% at sixth spawning. Fully matured females spawned between 19: 00 and 07: 00 with 92% of occurring from 21: 00 to 04: 00. Release of eggs took 5 minutes, and the terms of spawning was characterized as 64.2% spawned in the same day and 34.4% within 1 day after stocking in the spawning tank.<BR>In terms of the molt-cycle rhythm, there were also two peaks, first peak occurring between 10-12 days and second peak was between 26-30 days after ablation. It was observed that spawning increased 4-5 days after molting and decreased 4-5 days before molting. There was no relationship between female size, which ranged from 70-300g (BW), and molt-cycle duration. The molt-cycle duration of ablated females was between 13 and 25 days. Likewise, there was no correlation between female size and total number of eggs or nauplii for 1 month culture period.
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