脉红螺生态习性的初步研究

Preliminary Study on the Ecological Characteristic of Rapana venosa (Valenciennes)

室内人工条件下饲养脉红螺,流水式比静水式可提高成活率12%～25%。成体脉红螺(平均体重326g)对食物种类具有明显的选择性,且喜食同种饵料生物中的小个体。在繁殖前期摄食数量显著增多,进入交配产卵高峰期,停止进食。6月下旬至7月中旬,水温24～27℃,软体部占全部体重的40%时,进入交配产卵高峰期,并可多次交配、产卵,一次产卵量在8～15万粒。

The survival rate of Rapana venosa (Valenciennes) increases 12%～25%,with the indoor artificial conditions and flowing water.The adult Rapana venosa,which average weight are 326 grams,shows obviously selectivity to food variety and likes to eat smaller conspecific individual.During reproductive prophase food intake,improves distinctly and stops foraging while reproductive peakis coming.During late June to mid July,with temperature 24～27 ℃,when its soft part occuppies 40 percent of total weight it reaches reproductive peak and can copulate and spawn repeatedly.The individual lays 8×104～15×104 eggs each time.