Poultry by-product meal as dietary protein source for dourado, Salminus brasiliensis: an economic appraisal

Abstract

The dourado, Salminus brasiliensis, a large, carnivorous, Neotropical, Characin, is highly regarded for fish farming and sport fishing alike. However, studies on the farming and husbandry of dourado are still scarce. This study evaluated the performance of dourado fed diets formulated so as to contain increasing levels of poultry by-product meal as a replacement for fish meal and aimed to identify the maximum level of replacement to maximize profit. The trial was set up in a closed recirculation system with controlled water quality (temperature 27 °C, dissolved oxygen 6.5 mg L-1 , pH 7.4, and ammonia 0.25 mg L-1). Juvenile fish were stocked in tanks in a completely randomized design, acclimatized to system conditions and experimental diets, and then fed twice a day for 66 days with extruded, nutritionally complete diets (40 % digestible protein and 4020 kcal kg-1 digestible energy), formulated to contain 0, 20, 40, 60, 80 or 100 % poultry meal as a surrogate protein source for fish meal. Performance parameters-average weight gain, specific growth rate, feed consumption, feed conversion rate, protein efficiency rate, productive value of protein, energy retention rate, survival rate-did not differ (p > 0.05). To minimize the effects of influential data, the robust regression method was used and profit maximization analysis revealed that replacing 33.3 % of dietary fishmeal by poultry by-product meal maximizes profit in the farming of dourado.

Effect of a New Feed Daphnia magna (Straus, 1820), as a Fish Meal Substitute on Growth, Feed Utilization, Histological Status, and Economic Revenue of Grey Mullet, Mugil cephalus (Linnaeus 1758)

“…In addition, increasing gambusia meal reduced the cost of Nil tilapia diet, however, the cost-benefit analysis revealed that gambusia could only replace 50% of FM in terms of lower cost per unit of weight-gain compared to the control or other higher replacement levels [63]. The maximum profit was recorded by replacing 31.6% of dietary FM with poultry by-product meal in the diet of dourado, Salminus brasiliensis [64]. Interestingly, the present findings revealed that the use of DMM as a FM replacer reached 75-100% with a positive follow in the mullet performance and economic benefit.…”

Effects of enzymatic hydrolysates from poultry by‐products (EHPB) as an alternative source of fish meal on growth performance, hepatic proteome and gut microbiota of turbot ( Scophthalmus maximus )

“…In this study, the effects of enzymatic hydrolysates from poultry by-products as an alternative source of fish meal on turbot were evaluated. Poultry by-product as animal protein source has a more balanced amino acid composition compared to plant proteins, and the source is extensive and rich (Donadelli, Aguilar, Sonoda, & Cyrino, 2019). In addition to growth and immune performances, gut tissue sections, gut microbiota and hepatic proteome were studied for a comprehensive assessment of the effects of enzymatic hydrolysates on nutrition, physiology and health of turbot.…”

Concentrados proteicos na alimentação de dourado (>i<Salminus brasiliensis>/i<): aspectos zootécnicos, fisiológicos e econômicos

“…A análise econômica dos dados foi realizada pelo método da maximização do lucro (Griffiths et al, 1993;Varian, 2006;Yamamoto et al, 2017;Donadelli et al, 2019). A função lucro foi definida como a diferença entre a receita obtida com a venda do produto e os custos de produção do sistema para cada tratamento, conforme a equação (1):…”