Ultrasonic Biotelemetry Tracking Study Of Plectorhinchus Cinctu And Sparus Macrocephalus

Plectorhinchus cinctu belongs to the warm water fish, mainly distributed in the western Indian Ocean and the north Pacific, also inthe East China Sea and the Yellow Sea and in China mostly occurring in the South China Sea. P. cinctu mainly perches oncoastal reefs, near rocky and coral areaswithin the 50 m waters. They are carnivorous fishes, usually feeding on the crustacean and other fishes.Sparus microcephalusbelongs to the inshore warm water fish, mainly distributed in the western north Pacific. It distributed in coastal areas in China, relatively rich in theBohai Sea and the Yellow Sea. S. microcephalusmostly perches on thewater environmentwith coastal reefs and sand-mud on the bottom. They areeuryhaline and eurythermic fishes. They have strong ability to adapt to the environment, especially to the low temperature, with the living temperature of 4.3-34 ℃ and the dead temperature of 3.5 ℃. The optimum temperature forS. microcephalusranges from 17 ℃to 25 ℃. S. microcephalus is also a carnivorous fish that often feeding on shellfish products,other small fishes and shrimps.In recent years, the destruction of ecological environment in coastal waters and the increase catching ofmarine fishery resources havemade the fishery resources greatly reduced.In order to restore the ecological environment and fish resources, the activities of enhancement and releasingare ongoing year by year and become more important.In this paper we used biotelemetry tracking method, respectively tailedthe P. cinctuandS. microcephalus with wired and wireless receiving research, which comes to the conclusion as follows:P. cinctu mainly distributed mid-layer ranging 2m up and down, subsequently concentrated in the middle upper layer and changed smaller in the vertical direction; in the horizontal direction,P. cinctu swam to the all-around directions dispersedly based on the center of the experimental pool; P. cinctu was more likely to swim in the relatively small waters at the center of the experimental pool than the four corners according to the three-dimensional spatial distribution.S. microcephalus after releasing directly swam into the bottom, or swam in the sea surface for a period of time.In the follow-up research, S. microcephalusoverall swam up and down with a fluctuating type in the discharge area, evenly distributed in the 3 to 9 m layer.They roseto the sea surface to get food at night, sometimes at the bottom of the sea. In the horizontal direction they swam around culture zones, and not swam to the studied position. This was mainly influenced by the bait supplyin culture zones.The two experiments showed that when the fish reached a certain size, the ultrasonic pingers madesmaller effect on fish andwas suitable for application in fishestracking discharge of the same standard.The wireless receiver enlarged the receivingscope, made the wireless transmission of data and access to the tracking data come true. With this method we can track the fishaccurately and carefully, providing powerful basis for obtaining the life habits and migration regularity of fishes, technical support for getting a new releasingmethod and gaining basic knowledgeofefficient technology of enhancement and releasing.