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NotificationsNotify me of updates to Growth, Gametogenic Cycle and Seasonal Changes in Biochemical Composition of the Pacific Oyster Crassostrea Gigas in Relation to the Environmental Conditions of the Bizert Lagoon, Tunisia (pp. 185-212)
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Growth, Gametogenic Cycle and Seasonal Changes in Biochemical Composition of the Pacific Oyster Crassostrea Gigas in Relation to the Environmental Conditions of the Bizert Lagoon, Tunisia (pp. 185-212) $100.00
Authors:  (Salwa Dridi, Unité de Physiologie et d’ Ecophysiologie des Organismes Aquatiques, Institut National Agronomique de Tunisie, Mohamed Salah Romdhane, Institut National Agronomique de Tunisie, M’hamed Elcafsi, Unité de Physiologie et d’ Ecophysiologie des Organismes Aquatiques, Tunisia)
Abstract:
The relationship between growth, gametogenic cycle and the seasonal variations in
biochemical composition in the gonad-digestive gland of the bivalve Crassostrea gigas
was studied from January 2002 until January 2003. Changes in the shell growth and the
body weight are associated with metabolite accumulation in the complex gonad –
digestive gland, storage utilization of reserves, gametogenic events and environmental
parameters, especially food availability. This study reports the first evidence of
reproduction of Crassostrea gigas in the Bizert lagoon of Tunisia. Initiation of
gametogenesis took place in March when water temperature reached 14 °C. Ripe oysters
were observed in May at a water temperature of 20 °C. Spawning began in June and
reached a peak in September when water temperature ranged between 23 °C and 27 °C.
During the latter period, oysters presented gonads with ruptured follicles and residual
gametes. The study found that Crassostrea gigas showed a clear cycle of energy storage
and utilization in the Bizert lagoon. Total biochemical composition was about 6.67 % ±
1.34 of dry weight in lipids, 6.50 % ± 3.01 of dry weight in glycogen and 14.34 % ± 3.60
of dry weight in protein and. Lipid and glycogen concentrations in the gonad – digestive
gland 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 gametogenesis 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. The
process of growth was analyzed during the two phases of the gametogenic cycle.
Correlation between the different parameters of growth models noted during sexual
repose is greater than those determined during the gonadal activity, including ripeness
and spawning. The gametogenic cycle influence clearly the lengthwise and weight
modals of growth by affecting the bivalve with physiologic troubles traduced by win or
loose of the organic matter. During the sexual repose, fatty acids are accumulated in the
C. gigas tissues (total SFA, MUFA and PUFA (n-3) show the highest values
(respectively 26.38 % ± 1.78; 15.84 % ± 0.56; 46.94 % ± 0.61 of the total fatty acids).
The glycogen levels are also attempt the highest during the sexual repose (11,52 % ± 4,64
of the tissue dry weight). These biochemical components of the C. gigas tissues
contribute in the increases of shell length, width and thickness respectively (2,04 ± 0,18
cm; 0,58 ± 0,08 cm and 0,90 ± 0,06 cm from January 02 to February 02 and 1,25 ± 0,33
cm; 0,65 ± 0,11 cm and 0,28 ± 0,07 cm from November 02 to January 03) during this
phase of the gametogenic cycle. However during the gametogenic activity (March 02 –
September 02) total SFA, MUFA and PUFA (n-3) show the lowest values (respectively
23.13 % ± 1.38; 12.35 % ± 0.55; 38.15 % ± 0.84 of the total fatty acids) also the
glycogen levels decrease and attempt the minimum in September (2.09 % ± 1.98 of the
tissue dry weight) which increase the shell size by only 1,12 ± 0,08 cm, 0,64 ± 0,80 cm
and 0,57 ± 0,12 cm in length, width and thickness. Protein levels are comprised between
9,5 % ± 2,19 and 21,37 % ± 1,50 of the total tissues dry weight. At the expense of the
available food in autumn, protein concentrations increase to assure recovery of the tissue
weight of the bivalve. This metabolite has not any clear correlations with the shell growth
but contribute in supporting the bivalve essentially during summer when lipids and
glycogen reserves are depleted. 


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Growth, Gametogenic Cycle and Seasonal Changes in Biochemical Composition of the Pacific Oyster Crassostrea Gigas in Relation to the Environmental Conditions of the Bizert Lagoon, Tunisia (pp. 185-212)