Optimum level of dietary lipids for growth, chemical composition and apparent digestibility of lipids for Atractosteus tropicus

• Published in: Latin american journal of aquatic research Vol. 46; no. 5; pp. 1073 - 1082
• Main Authors: Huerta-Ortiz, Maricela, Alvarez-Gonzalez, Carlos Alfonso, Civera-Cerecedo, Roberto, Martinez-Garcia, Rafael, Camarillo-Coop, Susana, Goytortua-Bores, Ernesto, Pena, Emyr, Perez-Morales, Alfredo
• Format: Journal Article
• Language: English; Portuguese
• Published: Valparaiso Pontificia Universidad Catolica de Valparaiso, Escuela de Ciencias del Mar 01.11.2018; Pontificia Universidad Catolica de Valparaiso; Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
• Subjects: Ashes; Atractosteus tropicus; Catfish; Chemical composition; Condition factor; Conversion ratio; Diet; Digestibility; Dry matter; Feed conversion; Fish; Fish hatcheries; FISHERIES; Food conversion; Growth rate; Hatching; Juveniles; Lecithin; Lipids; MARINE & FRESHWATER BIOLOGY; OCEANOGRAPHY; Oils & fats; Organic chemistry; Polynomials; Proteins; Soybeans; Survival; Tropical climate; Trout; Weight gain; México; United States > US; juveniles; lipids; tropical gar; Atractosteus tropicus; Lepisosteidae; digestibility; polynomial models
• ISSN: 0718-560X; 0718-560X
• DOI: 10.3856/vol46-issue5-fulltext-19

Lipids requirement of tropical gar Atractosteus tropicus prejuveniles and juveniles was evaluated on growth, survival, chemical composition and apparent digestibility coefficient (ADC). Four semi-purified experimental diets (5, 10, 15 and 20% of lipids) were obtained with a mix of menhaden oil and soybean lecithin (2:1 ratio). Two trials were carried out, first with 600 prejuveniles of 0.5 g (35 days post-hatching, dph) for 56 days, and the second with 160 juveniles of 15 g (two-months-old) for 42 days. In the first trial, 15 (40.8 g) and 20% (40.2 g) lipid diets showed the best weight. Significant differences were obtained in condition factor (CF), daily lipid intake (DLI), hepatosomatic index (HSI), crude protein, ashes, nitrogen-free extract, moisture and ether extract between treatments. In the second trial, fish fed with the 10% lipid diet obtained the highest weight (89.1 g) compared with the other treatments. Significant differences were recorded for weight gain (WG), feed conversion ratio (FCR), specific growth rate (SGR), condition factor (CF), and lipid efficiency rate (LER). Also, significant differences were obtained in crude protein, ether extract, NFE, gross energy, apparent lipid ADC, protein ADC and dry matter ADC. The polynomial models applied to both trials indicated an optimum lipid requirement of 17% for 0.5 g juveniles and of 9% for 15.2 g juveniles.