Influência da salinidade sobre a sobrevivência e crescimento de Crassostrea gasar
Palavras-chave:
maricultura, ostra-do-mangue, estuário, fator abióticoResumo
O objetivo deste trabalho foi avaliar o efeito da salinidade sobre o crescimento e a sobrevivência da ostra-do-mangue Crassostrea gasar. Em laboratório foi realizado ensaio com 10 tratamentos em triplicata, correspondentes a valores crescentes de salinidade em intervalos de 5, na faixa de 5 a 50, perfazendo 30 unidades experimentais. A sobrevivência e o crescimento das ostras foram influenciados significativamente pela salinidade. Observou-se elevada sobrevivência de ostras na faixa de salinidade entre 10 e 45. Valores significativamente elevados de sobrevivência foram obtidos nas salinidades de 20 e 25, enquanto em 5 registraram-se menores porcentagens de sobrevivência. As médias finais de tamanho de concha e de peso vivo das ostras foram significativamente altas na salinidade de 25, enquanto que os menores valores de crescimento foram registrados em 5 e 50, em relação aos obtidos nas outras salinidades. Os resultados sugerem que a ostra C. gasar é resistente a uma ampla faixa de salinidade, podendo ser cultivada em áreas marinhas ou ambientes estuarinos que não apresentem salinidades iguais ou inferiores a 5.
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