Dietary inclusion of Schizochytrium limacinum meal can maintain key productive parameters of pink cusk-eel (Genypterus blacodes) juveniles with a reduction in fish oil

The pink cusk-eel (Genypterus blacodes) is a promising new candidate species to diversify cold-water aquaculture further. However, there are several knowledge gaps to establish a commercial-scale cultivation strategy, with optimum feed formulation being one of the main remaining challenges. This stu...

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Bibliographic Details
Published in:Latin american journal of aquatic research 2021-11, Vol.49 (5), p.804-811
Main Authors: Serrano, Edison, Simpfendorfer, Robert, Uribe, Juan Carlos, Medina, Alberto, Castro, Karla, Morales, Rodrigo, Davies, Simon J
Format: Article
Language:eng ; por
Subjects:
Algae
Aquaculture
Aquatic microorganisms
Biomass
Body weight gain
Candidate species
Carbohydrates
Catadromous fishes
Conversion ratio
Diet
Dietary intake
Docosahexaenoic acid
Efficiency
Extrusion
Fatty acids
Feed conversion
Feed formulation
Feeding experiments
Feeds
Fish
Fish oils
FISHERIES
Food conversion
Gene expression
Genypterus blacodes
Ingredients
Juveniles
Laboratories
Lipids
MARINE & FRESHWATER BIOLOGY
Marine fishes
OCEANOGRAPHY
Physical growth
Phytoplankton
Proteins
Reduction
Satiety
Schizochytrium limacinum
Statistical analysis
Sustainability
Water temperature
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Summary:The pink cusk-eel (Genypterus blacodes) is a promising new candidate species to diversify cold-water aquaculture further. However, there are several knowledge gaps to establish a commercial-scale cultivation strategy, with optimum feed formulation being one of the main remaining challenges. This study aimed to assess the dietary inclusion of Schizochytrium limacinum heterotrophic microalgae meal as a sustainable source of docosahexaenoic acid on fish growth and the condition status of pink cusk-eel juveniles. Three extruded diets were formulated to contain 0, 5 and 10% of dried algae and fed to duplicate groups of fish twice daily until apparent satiation during the 12-week trial. On termination of the feeding trial period, the average live weight gain did not show statistically significant differences between the three groups of juvenile fish, achieving an increase in weight of about two times at the end of the trial. Similarly, the protein efficiency and feed conversion ratios did not show significant differences among the experimental diets. On the contrary, a significant reduction in feed intake was observed as the dietary inclusion of microalgae meal increased. These results indicate that S. limacinum meal is a sustainable alternative ingredient for the dietary substitution of fish oil in commercial feed for G. blacodes at limited inclusion.
ISSN:0718-560X
0718-560X
DOI:10.3856/vol49-issue5-fulltext-2664