Graduate Thesis Or Dissertation
 

Shrimp processing waste as a pigment source for rainbow trout (Salmo gairdneri)

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  • A suitable method for the utilization of shrimp processing waste was investigated. The shrimp waste, which consisted of shell, viscera, and residual meat particles, was dried into a pink meal. This meal contained 5.4 percent moisture, 23.5 percent ash, 4. 1 percent crude lipid, 36. 3 percent actual protein, and 9. 5 percent chitin nitrogen. Its mineral analysis revealed 1.37 percent phosphorus, 11.50 percent calcium, 5.30 percent potassium, 1.28 percent sulphur, 3.0 ppm cobalt, 11.9 ppm copper, 412 ppm iron, 9.5 ppm manganese, and 75.0 ppm zinc. The shrimp waste meal was used as a dietary supplement for rainbow trout (Salmo gairdneri). It was incorporated into a purified diet at a level of 15 percent of the dry mix. After a feeding period of 24 weeks, the shrimp waste meal increased the pigmentation in the skin and muscular tissue of trout nearly 13 fold when comparisons were made to control fish. Sensory evaluations indicated that fish fed the diet containing shrimp waste meal were rated significantly (P > .01) higher in flavor and desirability than trout fed the control diet. An effective method to achieve pigmentation in the skin and muscular tissue of trout was investigated. Five pigment-rich diets were fed to separate groups of trout for 34 weeks. The pigmentation produced by each diet was compared to a sixth group of trout that received a control diet. The diet which contained 15 percent shrimp waste meal or a pigment-lipid extract of the meal proved the most effective in achieving muscular pigmentation. External pigmentation in the fins, skin, and operculum was produced more rapidly by the diet which contained a pigment-lipid extract of the shrimp waste meal. The carctenoid canthaxanthin did not produce pigmentation when fed in a crystalline form. Pigmentation was produced in the muscular tissue when canthaxanthin was fed in a water-dispersible form. Sensory evaluations showed that fish which received the shrimp waste meal or the pigment-lipid extract of the meal were rated significantly (P > .05) higher in firmness, color, and overall desirability than control trout. Trout that received the water-dispersible form of canthaxanthin were rated significantly (P > .05) higher than control trout only with regard to color.
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