SPAWNING OF THE TOPSHELL (Trochus niloticus L.) USING DIFFERENT INDUCE METHODS

摘要

The top shell (Trochus niloticus L.) is one of the endangered species as it is near to extinction in nature, due to fishery activities, without concerning its conservation. One of the alternatives to prevent the extinction of top shell is through seedling and spawning. This research was aimed to know successful rate of top shell spawning using different induce methods. Four methods were used to stimulate spawning: shock temperature, strong aeration, running sea water and a combination method (shock temperature and running sea water). The results showed that running sea water was more effective method to induce spawning of the top shell. While shock temperature with temperatures of 37 - 38oC or 4 -5oC above ambient temperature result in death of breeders. Accordingly, strong aeration is also alternative method in inducing spawning of the top shell.udKeywords: spawning, top shell, induce methods