5000 Kg of Floating Food for Millions of Hybrid Magur || Amazing Feeding System
introduction
Hybrids generally perform better than either parent for several important production traits, including survival, growth, disease resistance, and carcass yield (Dunham et al. 1990; Wolters et al. 1996; Bosworth et al. 2003). Economic analysis shows that hybrid catfish fry and forage fish production are generally more profitable than channel catfish at moderate feed prices, although the costs of fish seeds and seeds are higher and more capital is required to produce hybrid seeds (Ligeon et al. 2004a, b ). Due to advances in innovative breeding technology, there is more interest in producing hybrid catfish. Currently, hybrid catfish accounts for about 20% of the total catfish produced in the United States (personal communication, Brian Bosworth of USDA-ARS in Stoneville, Mississippi). However, relatively little is known about nutrition and specific feeding for hybrid catfish. The data presented in this report comes from five experiments conducted in ponds to evaluate dietary protein levels, alternative feed ingredients, and feeding frequency and performance frequency of hybrid catfish.
Method
All experimental diets were formulated to meet or exceed all known dietary requirements for channel catfish (NRC 2011) and produced as floating pellets. Hybrid catfish seeds were stocked in an experimental pond at the National Warmwater Aquaculture Center (NWAC) in Stoneville, Mississippi. Five pools were allocated for each treatment in a completely randomized design. Fish are fed once a day until they are full or at a predetermined maximum level (depending on the specific study) from April to October for one growing season. During the growing season, water temperature and dissolved oxygen were measured in the morning, afternoon and evening. Routine aeration is given when dissolved oxygen levels drop to 4 ppm. Total ammonia-nitrogen, nitrite-nitrogen, and pH were measured every two weeks during the growing season. Water quality is maintained within a range deemed adequate for optimal fish performance (Tucker and Robinson 1990). Dead fish were removed from the pond, weighed, and recorded for correction of feed conversion ratio (FCR) at the end of the study.
At the end of each feed evaluation study, 30 fish were selected from each pond to determine the processed yield. Fillets (one fillet per fish, 10 fish per pond) were stored at -4 ° F for closest analysis. After sampling, all fish from each pond are harvested, counted and weighed. The data collected included total feed given, net yield, weight gain, feed conversion ratio, survival, dressing yield, and close fillet composition. Protein, fat, and moisture were analyzed according to standard methods (AOAC 2000). All data were subjected to analysis of variance and Fisher's most significant difference procedure (Steel et al. 1997) using Statistical Analysis Systems software version 8.0 (SAS Institute, Inc., Cary, North Carolina).
Table 1.Composition of Experimental Food Ingredients (Percentage, as-fed) used in Experiment 1.
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16 май 2020
