The effect of weaning diet type on grey mullet (Mugil cephalus) juvenile performance during the trophic shift from carnivory to omnivory
| Autor: | I. Meiri-Ashkenazi, H. Rosenfeld, William Koven, A. Tandler, Enric Gisbert, Mikhail M. Solovyev, H. Nolasco Soria, O. Nixon, D. Israeli |
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| Přispěvatelé: | Producció Animal, Aqüicultura |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
пищеварительные ферменты
0303 health sciences Low protein Mugil Ontogeny всеядные рыбы 04 agricultural and veterinary sciences Aquatic Science Biology biology.organism_classification амилаза 03 medical and health sciences Animal science 040102 fisheries 0401 agriculture forestry and fisheries Juvenile Weaning Ulva lactuca серые кефали Omnivore 030304 developmental biology Trophic level |
| Zdroj: | IRTA Pubpro. Open Digital Archive Institut de Recerca i Tecnologia Agroalimentàries (IRTA) Aquaculture. 2020. Vol. 518. P. 734848 (1-10) |
| Popis: | In captive grey mullet (Mugil cephalus) juveniles, the weaning stage overlaps the period where there are changes in the ontogeny of digestive enzymes as the fry transit from carnivory to omnivory. The aim of this study was to evaluate growth, survival, weight distribution and the activity of pancreatic and brush border digestive enzymes when fry are fed a carnivorous, herbivorous or omnivorous weaning diet. Fifteen 17-L aquaria in a flow through system with 40‰, UV treated, temperature (24.5 ± 0.5 °C) controlled seawater were stocked with eighty-five 23 dph grey mullet larvae per aquarium. This allowed the testing of three weaning dietary treatments, differing in their protein and carbohydrate content, in 5 replicate aquaria per treatment from 24 to 53 dph. Diet 1 was the dried macroalgal species Ulva lactuca and was designated as a low protein: high carbohydrate herbivorous diet. Diet 2 was a commercial microencapsulated starter feed designated as a high protein: low carbohydrate carnivorous diet. Diet 3 was a 1:1 ww mixture of diets 1 and diet 2 representing an omnivorous feeding regime. The average final weight of the omnivorous feeding fish was significantly (P < .05) higher (203.9 ± 10.0 mg dry weight, dw) than their carnivorous (163.3 ± 7.1 mg dw) and herbivorous feeding (111.8 ± 14.0 mg dw) cohorts. The population of fish fed the herbivorous diet demonstrated a significantly (P = .02) higher percentage of smaller fish ( .05). The activity levels of brush border alkaline phosphatase and intracellular leucine alanine peptidase were similar in grey mullet fry fed the carnivorous and omnivorous diets, but were higher than those in fish fed the herbivorous diet (P < .05). The intestinal maturation index exhibited the highest and lowest values in mullet fry fed the carnivorous and herbivorous diets, respectively, whereas those from the omnivorous group showed intermediate values (P = .03). This study broadly suggests that aquaculture feeds for juvenile grey mullet should be designed for omnivorous feeding habits. info:eu-repo/semantics/acceptedVersion |
| Databáze: | OpenAIRE |
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