Study in Biological Features of Giant trevally(caranx iginoblis) in Tam Giang - Cau Hai lagoon systems, Vietnam
Abstract
Biological characterists and distribution of Giant trevally (Caranx iginoblis) in Tam Giang - Cau Hai lagoon systems, Vietnam showed that the species appeared in lagoon since 2005 and farmers start raising by cages at Tu Hien estaury for well-growing and best market to consumers, there were distributed of the fingerlings from estuaries into lagoon from October to December though inlets, so fishermen can collect every year by bottom nets and enclosed net. Fish are growing faster than other species but not sustainable growing in cages. Beside of this, wild fish can be collected at estuaries with averaed of the body weight 1.99 kg ± 1.22 kg and length 45.66 ± 17.56 cm. The species are big mouth and contained sharp teeth. There are flat body and and head lengt, pectoral fin rays, dorsal and anal yellow, gray dorsal, ventral surface is silver white. They adapted in water environmental conditions of pH (7.1 - 8.5), DO (2.7 - 4.5 mg/l), salinity (17.0 - 33.3 ‰) and temperatures (16.8 - 32.50C). Exposing of the reproductive performance of 50 fish samples were detected the mature females with male fish eggs or refined. Results slices and gonads in stage 1 and 2. The germplasm is a special source of valuable genes of the species.
Keywords: Giant trevally, lagoon, biological features, distribution
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