碩士 / 國立宜蘭大學 / 生物資源學院碩士在職專班 / 102 / This study aimed to investigate whether earthworm meal can replace fishmeal as a protein source for feeding white shrimps. It is not only assess the feasibility of earthworm meal for substituting fish meal in the diet for white shrimp but also its growth performance. The sensory evaluation was also taken in the end of both trials respectively as the consumers’ acceptance of shrimp meat fed on earthworm meal is paramount to the study. The first trial was conducted by shrimps fed with earthworm meal which substitute greater proportions of fishmeal i.e. with different proportions of 0 (whole fish meal), 25, 50, 75% fishmeal replaced by earthworm meal together as shrimp diets with the control group (i.e. conventionally commercial shrimp pellets). Five experimental groups of triplicates and sub-group shrimps of juvenile and junior respectively consist the total 30 tanks in each trial. During the eight-week experimental period salinity was maintained at 25ppt. Body weight was measured at every other week during the experimental period to adjust the feeding ratio of the surviving shrimps. The specific growth rate (SGR), feed conversion rate (FCR), survival rate (SR) were estimated to assess the overall growth performance of the animal. The result from Trial 1 indicated the most appropriate substitution rate of fishmeal with earthworm meal is 25%. Trial 2 was based on the results from Trial 1 and a lower earthworm meal replacement ratio at 12, 24, 36% of earthworm meal as well the control group (i.e. conventionally commercial shrimp pellets) for feeding shrimps was conducted at an eight-week feeding trial with adjusted feeding ratio of the surviving animals. The results showed that no significant differences was found in SR between the different substitution of earthworm meal replacing fishmeal. When considering SGR and FCR, the optimal substitution of fishmeal with earthworm meal is 25%. The sensory evaluation were also taken at the end of both trials. The evaluation panelists consisted 10 and 20 amateurs in both trials respectively. The panelists evaluate the quality by the color, flavor, juicy, texture, and the appreciation. After analyzing variance based on ANOVA, no significant differences between each treatment except the color being paler than conventionally commercial shrimp. No significant differences between the tested groups on flavor, juicy, texture, and the appreciation were found (P> 0.05). Hence, it can be anticipated the general public will appreciate the white shrimps fed on earthworm meal diets. Comprehensive implications of this study showed no significant differences between the small proportion of earthworm meal replacement (P> 0.05) on SGR. With the survival rate (SR), no significant difference between the white shrimp fed on earthworm meal (P> 0.05) as well the conventionally commercial shrimp diets. Hence, the consumers from the sensory evaluation would appreciate much the white shrimp products. Provided the local fish farmers can successfully breed the earthworms on their own, then the price for earthworm meal will be down to a reasonable level. Particularly in line with the environmental deterioration and following by the shortage of fishmeal supply due to overfishing in the future, the earthworm meal can be a good candidate as an alternative source of aquaculture feeds. Ultimately the earthworm may play an important role when practically implementing together with cyclical use of resource.
| Identifer | oai:union.ndltd.org:TW/102NIU01404010 |
| Date | January 2014 |
| Creators | Rou-Li Wang, 王媃麗 |
| Contributors | Yung-Song Chen, 陳永松 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 47 |
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