Environmental impact of green water on the Australian freshwater crayfish (Cherax quadricarinatus) larvae growth rate, survival and physiological responses at high stock density.

• Main Authors: Yi-Ling Li, 李宜玲
• Other Authors: Kuo-Hsun Chiu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/71016118099150682144

碩士 === 國立高雄海洋科技大學 === 水產養殖研究所 === 102 === The cultivation of Cherax quadricarinatus, an Australian freshwater crustacean, has progressively developed in various locations; however, the species is cannibalistic, especially during the larval stage. green water culture has been developed for a long period; it is characterized by stable water quality and reduced visibility, which provide a suitable environment for culturing biological organisms. This study investigated the influence of green water environments on the survival rate and growth of Cherax quadricarinatus. In the experiment, the animals used were crayfish juveniles which just left from mother (juvenile III) and adult crayfish. Each tank has 100 juveniles crayfish and 10 adult crayfish in three replicates of four treatments (clean water, A; green water, B; clean water + shelter, C; green water + shelter, D) were carried out for 30 days. Following the experiments, the specific growth rates and growth Increment of Groups B and D were considerably higher than those of Groups A and C; the survival rate obtained from Group D (72%) was significantly higher than those of the other groups. The results from the clear water group samples showed stressed physiological responses, whereas the green water did not influence the health of the Cherax quadricarinatus. Thus, the introduction of algae and shields facilitated the cultivation of the Cherax quadricarinatus larvae.