Hybrid 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.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-3264 |
| Date | 15 May 2009 |
| Creators | Savolainen, Lea Christine |
| Contributors | Gatlin III, Delbert M. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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