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ISSN : 1225-3480
2004년 1월부터 12월까지 가리맛조개, Sinonovacula constricta의 생식소 발달단계에 따른 생식주기를 조직학적 관찰에 의해 조사하였고, 폐각근과 내장낭, 족부근육 및 외투막의 생화학적 성분의 계절적 변화를 생화학적 분석방법에 의해 조사하였다. 본 종의 생식주기는 초기활성기 (3-5월), 후기활성기 (5-7월), 완숙기 (7-9월), 부분산란기(8-10월), 퇴화 및 비활성기 (10-3월) 의 연속적인 5 단계로 구분할 수 있었다. 총단백질 함량은 폐각근, 내장낭, 족부근육, 외투막 중 폐각근에서 가장 높았다. 외투막을 제외하고 일반적으로 성숙 및 산란기 중에 좀 더 높았다. 그러나 비활성기 중에는 좀 더 낮았다. 폐각근, 족부근육 및 내장낭 사이의 총단백질 함량은 양(+)의 상관관계를 나타내었다. 그러나 상관성은 통계학적으로 유의하지 않았다. 총지질 함량은 내장낭 내에서 가장 높았는데 폐각근, 족부근육 또는 외투막 내의 함량 보다 5-6배 더 높았다. 월별 변화는 내장낭 내에서 가장 크게 나타났는데, 초기활성기 (3-5월) 중에 처음 증가한 후 후기활성 기 (5-7월) 에 감소하였다. 그리고 산란기 (9월) 중에 급격하게 다시 증가했다. 족부근육파 폐각근 사이의 총지질 함량간에는 강한 음 (-)의 상관관계 (r = -0.634, p = 0.027)를 보였고, 폐각근과 외투막 사이에는 강한 양 (+) 의 상관관계 (r = 0.665, p = 0.018)를 나타내었다. 글리코겐 함량은 폐각근, 족부근육 그리고 내장낭 내의 총지질 함량 변화와 다소 유사한 경향을 보였다. 함량 변화는 초기활성기와 산란기 중에 높았고, 후기활성기와 퇴화 및 비팔성기 중에는 낮게 나타났다. 각 조직들 사이에 글리코겐 함량의 상관성은 통계학적으로 유의하지 않았다. 특히, 총지질 함량은 족부근육, 폐각근, 내장낭 및 외투막 사이에 음 (-) 의 상관관계를 나타내었다. 그러므로 이들 결과는 족부근육, 폐각근, 내장낭 및 외투막의 영양성분이 생식소의 에너지 요구에 반응하여 변하는 것으로 추정된다.
We investigated the reproductive cycle with gonad developmental phases of Sinonovacula constricta by histological observations, and seasonal changes in biochemical component of the adductor muscle, visceral mass, foot muscle and mantle were studied by biochemical analysis, from January to December, 2004. The reproductive cycle of this species can be classifed into five successive stages: early active stage (March to May), late active stage (May to July), ripe stage (July to September), partially spawned stage (August to October) and spentfinactive stage (October to March). Total protein content was the highest in the following order: adductor muscle, visceral mass, foot muscle, and mantle. Except for mantle, it was generally higher during the ripe and spawning stages, while lower during the spent/inactive stage. There were positive correlations in total protein contents among adductor muscle, foot muscle, and visceral mass. However, the correlations were not statistically significant. Total lipid content was the highest in the visceral mass; it was more than 5 or 6-fold higher than those in the adductor muscle, foot muscle, or mantle. The monthly change was also most dynamic in the visceral mass. It first Increased during the early active stage (March to May), decreased during late active stage (May to July), and then increased again rapidly during the spawning stage (September). There were a strong negative correlation in total lipid contents between foot muscle and adductor muscle (r = -0.634, p = 0.027), and a strong positive correlation between adductor muscle and mantle (r = 0.665, p = 0.018). Glycogen contents showed more or less similar pattern to total lipid contents in the adductor muscle, foot muscle, and visceral mass. It was higher during the early active and spawning stages, while lower during the late active and spent/inactive stages. There was no statistically significant correlation in glycogen contents among different tissues. Especially, total lipid content showed a negative correlationship between the foot muscle, adductor muscle, visceral mass and mantle. Therefore, these results indicate that the nutrient content of the foot muscle, adductor muscle, viseral mass and mantle changed in response to gonadal energy needs.
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