Replacement of Fishmeal by Eri Silkworm (Samia ricini) or Thai Crossbreed (j108 x Nhaglai) Silkworm in Goldfish (Carassius auratus) Diet on Growth Performance, Pigmentation, and Health Status Index
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Abstract
Eri silkworm (ESM) and Thai crossbreed silkworm j108 x Nhaglai (CSM) were evaluated to investigate the effect of replacement fish meal (FM) in goldfish diets on growth performance, pigmentation, and health status. The ESM and CSM were tested in a 12-week experiment on goldfish (Carassius auratus). Three hundred (5.00 ± 1.43 g) goldfish were divided into five groups and were fed ten diets: 0% (control), and fish meal (FM) replaced by ESM and CSM at rates of 25%, 50%, 75% and 100%. Water temperature ranged between 25 ± 1.8 ◦C. Thirty indoor rectangular fish tanks (1.5 m3) connected to a recirculating system were used. As a result, the highest final weight was in the fishes fed with ESM feed (75%). In addition, the replacement of CSM for FM at 25% had significantly highest final weight and body weight gain (P<0.05). Moreover, the fish fed with ESM 25% and 50% had higher yellow color intensity (b*) than the control group (P<0.05). On the contrary, there were no significant differences in the brightness (L*), red intensity (a*), b* of skin color and health status index in the CSM group (P>0.05). Therefore, these results clearly indicate that up to 50% of FM in goldfish diet can be replaced by ESM and CSM. Moreover, ESM can be useful for yellow color skin enhancement in goldfish.
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King Mongkut's Agricultural Journal
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