Browsing by Subject "Hybrid Striped Bass"
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Item Evaluation of amino acid supplementation of soybean-meal-based diets for hybrid striped bass(2009-05-15) Savolainen, Lea ChristineHybrid striped bass (Morone chrysops x M. saxatilis) aquaculture is a major commercial enterprise in the United States and internationally. Efforts to decrease diet costs and limit dependence on fishmeal, have led to the development of plant-based diets as an alternative aquafeed. Due to limiting concentrations of amino acids such as methionine, cystine, and taurine in plant meals such as soybean meal, supplementation of these plant-based diets with methionine or other sulfur amino acid compounds is typically required. Therefore, the current study was conducted to evaluate different amino acid supplements in soybean-meal-based diets for hybrid striped bass for possible refinement of diets and reduction of production costs. One feeding trial evaluated methionine hydroxy analog (MHA) and Mintrex? which is MHA containing chelated zinc relative to L-methionine. The second trial evaluated the effects of supplemental taurine or arginine on fish performance and potential health benefits. In the first feeding trial, a basal soybean-meal-based diet (56% soybean meal and 15% fishmeal) marginally deficient in total sulfur amino acids (TSSA) (1.10% methionine and cystine) was supplemented with either L-methionine, Mintrex? or MHA calcium salt and fed to triplicate groups of juvenile hybrid striped bass for 10 weeks. The different methionine supplements provided similar weight gain, feed efficiency ratio (FER) and protein efficiency ratio (PER) values that tended to be greater than observed in fish fed the basal diet. Mintrex? supplementation provided much higher plasma zinc concentrations compared to fish fed the other methionine supplements. In the second feeding trial, soybean-meal based diets which satisfied the requirement for TSAA were supplemented with either taurine or arginine at 1.5% of dry weight. Supplemental taurine or arginine did not provide any improvements in weight gain, FER, PER or survival compared to the basal diet. Thus, taurine or arginine supplementation of soybean-meal-based diets does not appear warranted. However, sulfur amino acid supplementation of plant-based diets is critical, and Mintrex? appears to be an effective supplement to meet the methionine and zinc needs of hybrid striped bass.Item Evaluation of the Nutritional Value of Seafood By-Product Blends with Red Drum Sciaenops Ocellatus and Hybrid Striped Bass Morone Saxatilis X M.Chysops(2014-05-06) Burns, Alton FDiets of many cultured fishes require high inclusion of fishmeal and fish oil. With the growth of aquaculture worldwide, demand for fishmeal and fish oil has increased resulting in higher prices of these ingredients due to increased demand but relatively static supplies. A promising source of alternative protein and lipid is the waste from seafood processing. This project evaluated four different types of seafood processing wastes as potential feed ingredients for the red drum (Sciaenops ocellatus) and hybrid striped bass (Morone saxatilis x M. chysops). Viscera and skeletal remains from filleted channel catfish (Ictalurus punctatus), black drum (Pogonias cromis), yellowfin tuna (Thunnus albacares) and krill (Euphausia superba) were evaluated with red drum and hybrid striped bass by determining nutrient and energy digestibility. Catfish, black drum, and tuna waste products were blended with soybean meal in a 40:60 ratio. All diets were subjected to dry extrusion, and then dried to produce stable ingredients. Diets used for the digestibility trial were formulated to contain 40% crude protein, 10% lipid and 1% chromic oxide as a marker, with each ingredient substituted in a reference diet at a 30:70 ratio. The yellowfin tuna fillet waste also was evaluated in a comparative feeding trial with juvenile red drum. In that trial, experimental diets with the tuna by-product meal replaced menhaden fishmeal on an equal protein basis at levels of 5, 10, 20, 40 or 60%. Diets were formulated to contain 40% crude protein and 12% lipid. Juvenile red drum were fed the various diets for 7 weeks in 38-L aquaria linked as a brackish (6 + 1 ppt) water recirculating system. Apparent digestibility coefficient (ADC) values for crude protein, crude lipid, and energy from krill and catfish meal were similar for red drum while the black drum meal had decisively lower values. Krill meal had higher ADC values for organic matter and energy than catfish meal and black drum meal in hybrid striped bass. ADC values of crude protein, and crude lipid were similar for krill, catfish, and black drum ingredients. Based on weight gain and feed efficiency responses in the feeding trial, red drum fed the control diet with only fishmeal significantly outperformed fish fed the tuna-substituted diets. However, no significant differences were observed among fish fed the diets with 5, 10, 20, or 40% tuna substitution. These results suggest that inclusion of seafood processing by-products can be substituted for fishmeal and possibly reduce the price of fish feeds.