통영주변해역에 출현하는 문치가자미와 도다리의 생물학적 연구

Abstract

Abstract

The feeding habits, maturation and spawning, and age and growth of marbled flounder, Pleuronectes yokohamae and finespotted flounder, Pleuronichthys cornutus were studied based on the collected from January to December, 2010 in the coastal waters off Tongyeong, Korea. P. yokohamae and P. cornutus were bottom feeding, generalist predators which mainly consumed amphipods, bivalves, polychaets, anthozoans. P. yokohamae and P. cornutus showed ontogenetic changes in feeding habits. Small individuals of P. yokohamae preyed mainly amphipods and polychaetes. However, large individuals of P. yokohamae preyed mainly bivalves, amphipods, polychaetes. Smaller individuals of P. cornutus preyed mainly urochords. Middle individuals of P. cornutus preyed mainly amphipods and polychaetes. However, large individuals of P. cornutus preyed mainly anthozoans. P. yokohamae and P. cornutus showed different reproduction characteristics. The spawning season of P. yokohamae lasted from November to January. Sex ratio showed significantly difference between females and males (1:0.41; χ2-test, P<0.01). Fecundity varied between 0.2 million and 200 million. The relationship between fecundity (F) and standard length (SL) for the P. yokohamae was expresserd as; F = 3.3724SL3.7852 (R2 = 0.9581). The relationship between the fecundity (F) and body weight (BW) was expressed as; F = 421.68BW1.2589 (R2 = 0.9468). The spawning season of P. cornutus lasted from September to November. Sex ratio showed a significantly difference between females and males (1:0.40; χ2-test, P<0.01). Fecundity varied between 22,000 and 220,000. The relationship between fecundity (F) and standard length (SL) for the P. cornutus was expresserd as; F = 0.1267SL4.7405 (R2 = 0.7248). The relationship between the fecundity (F) and body weight (BW) was expressed as; F = 110.07BW1.3418 (R2 = 0.709). P. yokohamae and P. cornutus were showed different age and growth characteristics. Annual rings in the otolith of P. yokohamae were formed in April and forming period of the first ring was about 1.25 years. The von Bertalanffy growth equstions for P. yokohamae were Lt=32.65(1-e-0.385(t+0.245)), Wt=680.603(1-e-0.385(t+0.245))2.8521 for females and Lt=27.25(1-e-0.228(t+1.819)), Wt=364.363(1-e-0.228(t+1.819))2.7797 for males. Annual rings in the otolith of P. cornutus were formed January and forming period of the first ring was about 1.25 years. The von Bertalanffy growth equations for P. cornutus were Lt=24.627(1-e-0.192(t+3.725)), Wt=340.795(1-e-0.192(t+3.725))2.6993 for females and Lt=23.668(1-e-0.247(t+2.429)), Wt=311.619(1-e-0.247(t+2.429))3.0376, for males.