Seasonal variation in weight and biochemical composition of the Pacific oyster, Crassostrea gigas in relation to the gametogenic cycle and environmental conditions of the Bizert lagoon, Tunisia
Seasonal variation in weight and biochemical composition of the Pacific oyster, Crassostrea gigas in relation to the gametogenic cycle and environmental conditions of the Bizert lagoon, Tunisia
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DOI：
10.1016/j.aquaculture.2006.10.028
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发表时间：
2007-03-06
期刊：
影响因子：
4.5
通讯作者：
Elcafsi, M'hamed
中科院分区：
文献类型：
--
作者：
Dridi, Salwa;Romdhane, Mohamed Salah;Elcafsi, M'hamed
从2002年2月到2003年1月，研究了比赞泻湖双壳类长牡蛎生化组成的季节变化与环境条件和繁殖事件的关系。对性腺内脏肿块进行了单独的分析。配子发生周期包括两个阶段：配子发生，包括成熟和产卵(3-9月)和在一年中剩余时间的性休眠。Bizert泻湖中的CGigas显示出明显的能量储存和利用周期。总生化组成糖原占干重的6.50%+/-3.01，蛋白质占干重的14.34%+/-3.60，脂肪占干重的6.67%+/-1.34。性腺内脏团块中的脂肪和糖原浓度呈负相关：糖原的最高浓度出现在12月至2月之间，并与最低的脂质浓度相对应。冬季记录的高糖原含量支持配子发生过程，然后逐渐下降，成熟期和夏季达到低值，对应配子首次释放(6月)和总产卵开始，而性腺中脂质在最大成熟期(春季)积累，夏季下降。在秋季，总脂肪酸值的增加似乎与可获得的食物有关，并与叶绿素a浓度的增加有关。蛋白质含量在一年中表现出许多变化。高蛋白水平出现在5月和7月，与卵母细胞成熟相对应，然后在夏末(总产卵开始)下降。在秋季失去可获得的食物的情况下，蛋白质浓度再次增加，以确保双壳类组织重量的恢复，这导致了条件指标值的增加。(C)2006爱思唯尔B.V.保留所有权利。
Seasonal variations in biochemical composition of the bivalve Crassostrea gigas were studied from February 2002 until January 2003 in the Bizen lagoon in relation to environmental conditions and reproductive events. Separate analyses were made of gonad-visceral mass. The gametogenic cycle comprised tow phases: gametogenesis including ripeness and spawning (March-September) and sexual repose during the rest of the year. The C gigas in the Bizert lagoon showed a clear cycle of energy storage and utilization. Total biochemical composition was about 6.50%+/- 3.01 of dry weight in glycogen, 14.34%+/- 3.60 of dry weight in protein and 6.67%+/- 1.34 of dry weight in lipids. Lipid and glycogen concentrations in the gonad-visceral mass were inversely related: maximum concentrations of glycogen occurred between December and February and corresponded with minimum concentrations of lipids. High glycogen contents recorded in winter supported the processes of gamatogenesis and then decreased progressively to attain low values at maturity and during summer corresponded to the first emission of gametes (June) and the beginning of total spawning, however lipids are accumulated in gonads during the period of maximum ripeness (spring) and decrease in summer. During autumn, the increase of total fatty acids values appeared to be related to the available food in association with an increase in the chlorophyll a concentrations. Protein contents show many variations throughout the year. High protein levels occurred in May and in July which corresponded to oocyte maturation and then decreased in late summer (beginning of total spawning). At the expense of the available food in autumn, protein concentrations increase again to assure recovery of the tissue weight of the bivalve, which induced an increase in the condition indices values. (c) 2006 Elsevier B.V. All rights reserved.