Density Effect of the Keeled Mullet Fish Liza Carinata on Some Reproductive Hormones and Some Heavy Metals With a Vision of the Mullet Production in Suez Bay.

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Abstract

A total number of 200 Liza carinata fish with an initial weight of about 10g were studied. They were divided by ratio to four densities 50, 100, 150, and 200 fish per cubic meter in aquaria within a wet laboratory for 45 days. Fish have been fed on commercial diets 32% crude protein, twice daily for 6 days per week, as 3 % of biomass weight of fish. Total testosterone hormone, FSH, growth hormone, cortisol, hematological parameters, heavy metal in the fish gut, muscles, and liver, and biochemical composition of the fish body were measured at the end of the experiment. Water quality was measured biweekly during the experimental period. Results showed that FSH and testosterone hormones were significantly increased (0.96±0.02 IU/ml and 2.85±0.04 ng/dl) in the first treatment for females and males, respectively. Growth hormone was significantly decreased in (T4 ) which recorded 0.57±0.03 ng/ml. Cortisol was significantly increased (70.5±1.3 µg/dl) in (T4), while it was significantly low (56.3±0.9 µg/dl) in the first treatment. Heavy metals analysis in tissues showed that accumulation of Fe was highest then Zn and finally Cu. Chemical body analysis showed a significant increase for crude protein, crude fat, and ash content in (T1), that recorded (15.6±0.2, 4.22±0.05, and 5.86±0.09 %) respectively. Field visits were performed that revealed the economic, nutritional importance, and productivity of mullet fish in the Suez Bay. It was clear that production is in a continuous decrease throughout the last years.

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Egyptian Journal of Aquatic Biology and Fisheries
Volume 25, Issue 1 - Serial Number 1
January and February 2021
Pages 195-211

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