서귀포産 자리돔의 漁獲改善 및 適正利用을 위한 資源生物學的 硏究-1. : 生活週期와 産卵 Life Cycle and Spawning = Fisheries Biology for Fishing Improvement and Optimum Catch of a Damsel Fish, Chromis notatus(Pisces, Pomacentridae) in Seogwipo, Jeju Island - 1.

국문 초록 (Abstract)

제주도의 主要水産生物인 자리돔에 있어서 成長過程, 産卵期, 生活史등의 硏究가 西歸浦沿岸에서 이루어졌다.
生殖巢의 熟度指數 및 組織學的觀察에 의하면, 本種의 産卵盛期는 5월下旬∼8월下旬까지의 3個月間이며 雌雄 모두 體長 60㎜ 以上이면 再生産活動에 參與하나 主産卵群은 體長 70∼90㎜의 個體群이다.
本種의 卵巢內 最大卵 은 0.60∼0.75㎜의 範圍이고 抱卵數는 10,000∼90,000 個程度의 폭넓은 變化를 보였는데, 同一體長의 個體中에서도 體重과 生殖巢重量이 모두 높은 成熟個體일수록 抱卵數가 많은 特性을 나타내고 있었다.
여름철에 産卵된 卵은 부화되어 後期仔魚時期에 이미 表層 가까운 곳으로 浮上하고 빠른 성장을 나타내어 가을철에 體長 40㎜까지 자라고, 겨울철을 넘긴 後 翌年 늦은 봄철이 되면서 成熟하여 再生産에 參與한다. 이들 成魚의 成長速度는 産卵期동안 極히 느리지만 계속적으로 成長한 結果 부화後 2年째 여름철에는 體長이 80㎜ 以上에 달하면서 다시 한번 再生産活動에 參與한 후 死亡한다고 推定된다. 이것은 本種의 壽命이 2年이라는 것을 가리키고 있다.
서귀포沿岸에서 採集된 자리돔의 最大體長 및 體重은 各各 121㎜, 72,68g이었다.

다국어 초록 (Multilingual Abstract)

Many Chromis notatus(TEMMINCK et SCHLEGEL), one of the most abundant inshore-rocky fish in Jeju Island, have been collected near Seogwipo on the southern part on Jeju province, Korea. These collections have provided some information regarding the growth pattern, life history, and breeding season of this species.
On the basis of the gonad index and the histological observation of gonads, it is shown that the main breeding season for this fish is from late May to late August, when most of the males and females are longer than the 60mm standard length(SL) at maturity. The main breeding group of this species is the population within the 70 to 90 mmSL.
The long axis of the largest egg ranged from 0.6 to 0.75mm. the fecundity ranged from about 10,000 to 90,000 eggs, indicating a great variation among the number of eggs produced. the number of eggs increased with the females having heavier body and gonad weights.
The postlarvae migrated toward the surface water after hatching in summer and grew rapidly to about 40 mmSL until autumn. They maintained constant growth until the following spring when the specimens over 60 mmSL matured during the summer. The growth rate of the mature individuals gradually decreased during the breeding season. However, they eventually grow to over 80 mmSL 2years after hatching. They died after reproducing one more time, indicating that the life span of the species is estimated to be at least 2 years.
The maximum standard length and the body weight of this species were 121mm and 72.68g, respectively.