中国对虾异常交配现象的观察

于1989年11月9日—12月10日,在山东莱州市东方红盐场养殖分场亲虾越冬室内,对35尾异常交配雌对虾进行了观察研究。结果表明,异常交配行为能引起对虾各种疾病,导致亲虾群体质量下降、数量减少。提出在人工越冬亲虾交配季节,应及时将已交配的雌虾选出单独培养,同时在越冬的早期水温较高时,不宜在已交配雌虾池内搭配雄虾。

OBSERVATION ON ABNORMAL MATING OF PENAEUS CHINENSIS

During the period from November 9 to December 10, 1989, 35 mated Penaeus chinensis specimens were picked out and fixed in 10% formalin solution for mating behaviour observation studies under the dissecting microscope. Results of observation are as follows:1. During the first normal mating process, spermatophores are stored in the thelycum of the female shrimp. Subsequent mating may result in successful or unsuccessful abnormal mating depending on whether the spermatophores of the male shrimp are inserted in certain parts of the female shrimp body other than the thelycum, or are not deposited at all after the mating process.2. Based on the external appearance of the remains of the thelycum of normally mated females, it is here suggested that abnormal mating may follow normal mating. During the normal mating process, spermatophores are stored in the female of the thelycum. Out of protection for its spermatophores, the normally mated female shrimp refused the subequent mating and so resulted in abnormal mating.3. Abnormal mating can result in loss of the male spermatophores and damage of the female shrimp body and finally cause a decline in quality and quantity of parent shrimp stocks. Abnormal mating is a harmful phenomenon and preventive measures should be taken. in artificial overwintering culture during the ma ing season of the parent shrimps, once the female shrimps have been mated, they should be picked out in due time and reared separately to prevent their mating again. During the early stage of overwintering culture, when the water temperature is high, it is best not to place male shrimps in the same pond with mated female shrimps.