Growth Modelling And Bioenergetic Assessment Of The Pacific Oyster Magallana Gigas Cultured On The Algerian Coast Using Dynamic Energy Budget Theory
Auteurs : Chabane Juba . Handjer Houria . Boutarane Madjeda . Bourichi Wissam .
Résumé
The Pacific oyster, Magallana gigas, is widely cultivated due to its rapid growth and resilience to environmental fluctuations. This study represents the first DEB-based bioenergetic assessment of M. gigas on the Algerian coast, combining classical Von Bertalanffy growth modeling (VBGF) with the mechanistic Dynamic Energy Budget (DEB) theory. A total of 229 oysters were sampled monthly from January to May 2025 in a sub-surface longline system at CULTMARE farm, Tipaza, Algeria. Empirical growth analysis yielded a VBGF asymptotic length (L∞) of 26.8 cm and a growth coefficient (K) of 0.85 year⁻¹ over the 5-month observation period. DEB-derived parameters allowed simulation of lifetime growth, predicting L∞ = 25.2 cm and K = 0.0247 year⁻¹, reflecting differences between short-term empirical estimates and full life-cycle growth potential. Length–weight relationships indicated negative allometry (b = 2.32), consistent with preferential energy allocation to shell elongation. DEB simulations highlighted temperature and food availability as primary drivers of growth trajectories and biomass accumulation. Optimal growth occurred at 20 °C with high trophic availability, while suboptimal conditions limited performance. These results provide a robust framework for predicting oyster growth under environmental variability and support sustainable aquaculture management in Algeria.
Mots clés
Magallana gigas ; Aquaculture ; Growth ; Moodling ; Bioenergetics ; Temperature ; Food ; DEB
