Nutritional value (fatty acids) of some Japanese seaweeds for the culture of the tropical white sea urchin, Tripneustes gratilla
1998
Floreto, E.A.T. (26 Greyhound Subd., Pardo, 6000 Cebu City (Philippines))
All marine animals are perceived to have some essential fatty acid (EFA) requirement for proper growth and nutrition. For many marine herbivores, this EFA requirement is obtained from seaweed diet. Seaweed PUFA profiles are taxonomically determined according to phyla. Green seaweeds are rich in C16 and C18 PUFA (16:4n-3, 18:3n-3 and 18:4n-3); red seaweeds are high in C20 PUFA (20:4n-3 and 18:4n-3) and C20 (20:4n-6 and 20:5n-3) while brown seaweeds are abundant in C18 (18:3n-3 and 18:4n-3) and C20 (20:4n-6 and 20:5n-3) PUFA. By conducting feeding trials using different seaweeds, the EFA requirement of marine herbivores could be approximated. The results are useful in the development of artificial diets for their intensive culture. This study conducted feeding experiments to assess the dietary value of some Japanese seaweeds (with emphasis on their FA profile) for the culture of juveniles of the white sea urchin, Tripneustes gratilla. The brown seaweed resulted in the best specific growth rates, body weight gains and feed conversion efficiencies probably due to its high overall content of lipid, PUFAs and total FAs compared to the green and red seaweeds. Dietary EFA requirements for the juveniles of the white sea urchin, T. gratilla possibly consist of 18:3n-3, and 18:4n-3 and 20:4n-6, as seaweed diets deficient in these FAs (the red or the green seaweeds) were associated with poor growth
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