Influences of Photoperiod and Light Intensity on Gonad Maturation, Spawning and Mating Rate of the Adult Prawn, Penaeus monodon.

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To investigate the effects of photoperiod and light intensity on gonad maturation, spawning and mating rate of the adult Penaeus monodon, two experiments were carried out from July to September in 1991. In experiment 1, the effects of the short (13 h light and 11 h dark, 13 L: 11 D) and long day lengths (15 L : 9 D, 17 L : 7 D) did not show a significant difference of the development of the gonad, spawning, rematuration, spawning times and molting cycle of the wild P. monodon, however, short day-lengthes tended to promote better mating rate probability than long day-lengths. Light intensity (2-5 lx, 20-25 lx) had no direct effect on either spawning rate or rematuration, but 2-5 lx may increase ovarian maturation and mating rate compared with 20-25 lx. In experiment 2, the photoperiod (1 L : 23 D, 12 L: 12 D, 23 L: 1 D) also did not effect the gonad maturation, spawning, rematuration, fecundity, molting cycle and survival rate, but the mating rate of the wild/pond-reared P. monodon showed a good result at 12 L: 12 D (natural day-length) .
日本水産増殖学会の論文