クロアワビの成熟や成長におよぼす明暗周期の影響

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In order to develop efficient systems for rearing abalone, Haliotis discus, 3 year old individuals were reared for 1 year at 5 different photoperiods of 15L9D, 12L12D, 9L15D, 6L6D and 24D and shell growth and gonad development investigated. A rearing cage shelter with 16 individuals of Haliotis discus was placed in each experimental tank (dimensions 54 × 35 × 28 cm) with through flow conditions and seawater temperature allowed to fluctuate naturally. Each tank was covered with a black sheet and the photoperiod controlled using 20W× 2 incandescent lamps fixed directly above the tank and set by a switch timer. The gonad index reached the maximum value in all photoperiods but the period required to reach the maximum value varied among the photoperiods with the 15L9D, 12L12D and 6L6D showing delayed gonad development compared to 9L15D and 24D. Shell growth for each photoperiod was closely related with the gonad development. Growth was greater in photoperiod treatments in which completion of spawning occurred earlier. Furthermore, a significant difference (Tukey’s HSD test, P<0.05) was observed between the growth of the 24D treatment and the other photoperiods. Larger growth was observed each month for the 24D treatment and also for the growth over the entire 12 month period compared to the other photoperiods. It is concluded that gonad development varies with the effect of photoperiod and that growth was maximized under the 24D treatment of constant dark conditions.
生態工学会の論文
2007-07-31

クロアワビの成熟や成長におよぼす明暗周期の影響

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