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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
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Your Position :Home->Past Journals Catalog->2012 Vol.31 No.3

Effects of Broodstock Body weight, Age and Stress on the Reproductive Performance of the Leech, Hirudinaria manillensis Lesson, 1842
Author of the article:ZHANG Bin1, GONG Yuan2, YU Xiang3*, Lü Jun-yi4
Author's Workplace:(1. Guangxi Key Laboratory of Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Institute of Fisheries, Nanning 530021, China; 2. Jingzhou MinKang Biotechnology Co., Ltd, Jingzhou 434300, China; 3. Freshwater Fisheries Research Institute of Liaoning Province, Liaoyang, Liaoning Province 111000, China; 4. School of Life Sciences, Sun Yat-Sen University, Guangzhou 510275, China)
Key Words:Hirudinaria manillensis; reproductive performance; body weight; age; stress
Abstract:The effects of broodstock body weight, age and environmental stress on the fecundity of the Hirudinaria manillensis under experimental conditions was evaluated using single factor analysis of variance as well as other methods. The results showed that the broodstock body weight cannot influence the cocoon size and wet weight, or the body length, body width and wet weight of juvenile significantly (P>0.05). Gonadal somatic index of parent leech, mean number of cocoons produced, hatching rate and mean hatching number of cocoon under different broodstock body weights were significantly different (P<0.05), and among the three groups, the broodstock body weight of 10~15 g were higher than other groups (P<0.05). Broodstock age significantly affected the mean number of cocoons produced, hatching rate and mean hatching number of cocoon, and cocoon size (P<0.05). The mean number of cocoons produced, hatching rate and mean hatching number of cocoon were the highest under the broodstock age of 2 ~ 3 years. The cocoon size of 8 months parent leech was obviously greater than others (P<0.05). The cocoon wet weight, body length, body width and wet weight of juvenile were not significantly different among the four broodstock age groups (P>0.05). Environmental stress had a significant impact on the mean number of cocoons produced, hatching rate and mean hatching number of cocoon (P<0.01). Among the four groups, the mean number of cocoons produced and hatching number of cocoon under the stress of 1~2 times were the highest, and the hatching rate of cocoon under control group was higher than others, yet which between stress groups of 0 and 1~2 times present no difference (P>0.05). The cocoon size and wet weight, and the body length, body width and wet weight of juvenile were not significantly different among the four environmental stress groups (P>0.05). In conclusion, the investigation has obtained the optimal broodstock body weight and age, and suggests that the body weight of 10~15 g and age of 2~3 years could be used to select the parent leeches for the breeding industry of this species, during the course of which, environmental stress of 1~2 times might improve the reproductive efficiency of parent leeches.
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