여수 연안 숭어 (Mugil cephalus)의 연령과 성장 연구
Age and growth of the flathead grey mullet (Mugil cephalus) in the coastal water of Yeosu
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2009년 9월부터 2010년 8월까지 여수 근해 해역에서 채집된 숭어를 사용하여 연령과 성장에 관한 연구를 수행하였다. 본 연구에서는 숙도지수 (GSI)를 활용하여 산란시기를 추정하였다. 이석을 활용하여 연령을 판독함에 있어 2명의 판독자가 각각 독립적으로 판독을 수행하여 연령판독의 일치도를 비교하였고, 또한 각각의 판독결과를 비교하여 일치도를 비교하였다. 판독자 간의 연령 일치도는 84%로 나타났다. 숭어의 연령 사정 결과 1세에서 8세까지 나타났다. 연령별 체장은 1세 17.41cm, 2세 25.17cm, 3세 31.69cm, 4세 37.40cm, 5세 41.59cm, 6세 45.68cm, 7세 49.22cm, 8세 51.92cm이었다. 연령별 평균 체장으로부터 추정된 숭어의 성장파라미터는 성장계수 (K)는 0.164/yr, 이론적 최대체장 (L_∞)은 67.97cm, 체장이 0일 때의 이론적 연령 (to)은 －0.81yr이었다.
Abstract
The age and growth of flathead grey mullet, Mugil cephalus, were studied using samples collected from the coastal water of Yeosu from September 2009 to August 2010. Spawning season estimated from the gonadosometic index (GSI) was from November to January. A method for increasing the readability of the otolith was described and criteria for the interpretation of otolith was provided. The annual ring was formed in September once a year. Annual ring in otolith for flathead grey mullet is validated for fish aged 1-8 using the marginal increment analysis. Using the sectioned otolith, between reader precision was 84%. Also, Within-reader agreement for sectioned otolith age readings was higher (reader 1〓84%, reader 2〓87%). The relationship between fork length and total weight was TW〓0.022FL2.818. The estimated von Bertalanffy growth parameters for the flathead grey mullet were L_∞〓67.97cm K〓0.164/year and to〓－0.81year.
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