동경만산 문치가자미의 연령과 성장

Age and Growth of the Marbled Sole Limanda Yorohamae in Tokyo Bay , Japan

1986년 5월부터 1988년 4월까지 정기 채집한 545 개체와 정점 채집한 525개체등 합계 1,070개체의 이석을 적출하여 연령 형질로서 사용했다. 이석 연근의 투명대와 불투명대의 관찰 결과, 투명대 형성개시시기는 5월이며, 불투명대 개시시기는 1월이었다. 투명대와 불투명대는 년1회 형성되므로 투명대 외연을 연령표시로서 이용했다. 이석 반경과 표준체장의 관계식으로부터 각륜 형성시의 체장을 역산했다. Lee 현상은 보이지 않았으며, 이석반경과 표준체장은 곡선개계를 나타냈다. 각 연령 형성시의 계산체장은 이용하여 von Bertalanffy 성장식을 다음과 같이 구했다. Male ;Lt=376.9{1-exp[-0.303(t-0.202)]} Female ;Lt=255.7{1-exp[-0.505(t-0.149)]} 여기서, Lt는 표준체장(mm)이고, t는 연령이다.

Age and growth of the Marbled Sole Limanda Yokohamae in Tokyo Bay were studied by otolith reading of 1,070 fishes from May 1986 to April 1988. Examination of the outer margins of the otoliths showed that the hyaline zone as annulus was formed once a year and that its formation was completed at the end of the spawning season (Feb. to Apr.). Growth of the fish was expressed by the von Bertallinffy's equaion as Lt=255.7{1-exp[-0.505(t-0.149)]} for males and Lt=376.9{1-exp[-0.303(t-0.202)]} for females, where Lt is standard length in mm and t is age in years. It was found that the growth of males and females differs, with the females showing a higher growth than the males at each estimated age. Growth in body weight was also examined. Most of the fish examined were found to be not more than three years old, although the oldest fish were four years old for males and seven years old for females.