Study on the Release of Grouper Epinephelus for Stock Enhancement

Two methods,tagging and ink injection,are used in the grouper releasing experiment.The studied fishes are the juvenile of Epinephelus akaara and Epinephelus awoara both artificially cultivated and caught from natural waters,and their wild adults.Experimental results show that the inhabiting behaviours for both juvenile and adult fishes show distinct regionality,which move within an area of 2n mile diameter 651 days and 48 days after being released,respectively,With the tagging method,the tagged fishes could only be recaptured in the year of release while,with the injection method,they could be caught in the lst,2nd and 3rd years,It is confirmed that in the cement tank,the tagged fishes lose their 1/3 tags.That means that the tagging method is not fit for the release research while the injection method is .Generally,the recaptured rates of injected fishes are 1.4-4.5%,3.1-13.4%and 2.7%for the lst,1nd and 3rd years,respectively.

Study on the Release of Grouper Epinephelus for Stock Enhancement

Two methods, tagging and ink injection, are used in the grouper releasing experiment. The studied fishes are the juvenile of Epinephelus akaara and Epinephelus awoara both artificially cultivated and caught from natural waters, and their wild adults. Experimental results show that the inhabiting behaviours for both juvenile and adult fishes show distinct regionality, which move within an area of 2 n mile diameter 651 days and 48 days after being released, respectively. With the tagging method, the tagged fishes could only be recaptured in the year of release while, with the injection method, they could be caught in the 1st, 2nd and 3rd years. It is confirmed that in the cement tank, the tagged fishes lose their 1/3 tags. That means that the tagging method is not fit for the release research while the injection method is. Generally, the recaptured rates of injected fishes are 1.4 ~ 4.5 %, 3.1 ~ 13.4 % and 2.7 % for the 1st, 2nd and 3rd years, respectively.