Comparison of Fresh Fish and Formulated Diets on Growth Performance of Cobia (Rachycentron canadum) Cultured in Sea Cages in Ban Ko Pu, Krabi Province, Thailand
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Abstract
This study aimed to compare the effects of fresh fish feed and commercial pellet diets on growth performance, survival rate, and feed utilization efficiency of cobia (Rachycentron canadum) cultured in marine cages at Ban Koh Pu, Krabi Province, Thailand. A Completely Randomized Design (CRD) consisting of three dietary treatments with three replicates per treatment was employed. Thirty fish were stocked in each cage and reared for 180 days. The results showed that the initial body weight of fish did not differ significantly among treatments (p>0.05). At the end of the experiment, fish fed the fresh fish feed exhibited the highest final body weight (2,023.16±22.62 g) and daily weight gain (8.01±0.13 g day⁻¹), which were significantly higher than those of fish fed the commercial pellet diets (p<0.05). Final body length differed significantly among treatments (p<0.05), whereas daily length gain showed no significant difference (p>0.05). Survival rates ranged from 91.12±2.65 to 93.34±2.31% and did not differ significantly among treatments (p>0.05). Similarly, feed conversion ratio (FCR) values ranged from 1.60±0.31 to 1.72±0.31, with no significant differences among treatments. Overall water quality remained within ranges suitable for marine cage culture of cobia throughout the study period. The findings indicate that fresh fish feed promoted better growth performance than the commercial pellet diets under the culture conditions of the present study. The results provide useful information for feed management strategies in community-based and commercial cobia cage farming operations.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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