The comparisons were made in three species of Cynoglossus, Cynoglossus semilaevis, Cynoglossus robustus and Cynoglossus abbreviatus. Cynoglossus semilaevis is not only the longest and the widest in three fishes, but a...The comparisons were made in three species of Cynoglossus, Cynoglossus semilaevis, Cynoglossus robustus and Cynoglossus abbreviatus. Cynoglossus semilaevis is not only the longest and the widest in three fishes, but also the thickest when it matures. Cynoglossus semilaevis has the highest head, while Cynoglossus robustus has the longest lip. Cynoglossus semilaevis is not only the largest in size , but also grows fastest. Before one years old, Cynoglossus abbreviatus is larger in size and grows faster than Cynoglossus robustus, but at four years old , Cynoglossus robustus is larger in size and grows faster than Cynoglossus abbreviatus. The inflection points of growth curves of Cynoglossus semilaevis, Cynoglossus robustus and Cynoglossus abbreviatus are 3.24, 2.38 and 2.35 respectively.展开更多
The tonguefish Cynoglossus semilaevis (Günther) is a rare fish species in Chinese offing, inhabiting in the warm water bottom. The metaphase chromosome preparation of the fries has been got from their fins by hot...The tonguefish Cynoglossus semilaevis (Günther) is a rare fish species in Chinese offing, inhabiting in the warm water bottom. The metaphase chromosome preparation of the fries has been got from their fins by hot air drying methods, while the metaphase chromosomes of one year old young fish which has physiologically sex differentiation has been got from their renal tissues by the method of PHA and colchicine injection. The karyotypes were examined. The result shows that there are 42 acrocentric chromosomes in diploid and their karyotype formula is 2n=42t, and there existed heterotypic sex chromosome which belongs to ZW/ZZ type. The sex ratio in artificial bred stock is nearly 1∶1.展开更多
文摘The comparisons were made in three species of Cynoglossus, Cynoglossus semilaevis, Cynoglossus robustus and Cynoglossus abbreviatus. Cynoglossus semilaevis is not only the longest and the widest in three fishes, but also the thickest when it matures. Cynoglossus semilaevis has the highest head, while Cynoglossus robustus has the longest lip. Cynoglossus semilaevis is not only the largest in size , but also grows fastest. Before one years old, Cynoglossus abbreviatus is larger in size and grows faster than Cynoglossus robustus, but at four years old , Cynoglossus robustus is larger in size and grows faster than Cynoglossus abbreviatus. The inflection points of growth curves of Cynoglossus semilaevis, Cynoglossus robustus and Cynoglossus abbreviatus are 3.24, 2.38 and 2.35 respectively.
文摘The tonguefish Cynoglossus semilaevis (Günther) is a rare fish species in Chinese offing, inhabiting in the warm water bottom. The metaphase chromosome preparation of the fries has been got from their fins by hot air drying methods, while the metaphase chromosomes of one year old young fish which has physiologically sex differentiation has been got from their renal tissues by the method of PHA and colchicine injection. The karyotypes were examined. The result shows that there are 42 acrocentric chromosomes in diploid and their karyotype formula is 2n=42t, and there existed heterotypic sex chromosome which belongs to ZW/ZZ type. The sex ratio in artificial bred stock is nearly 1∶1.
