The Effects of Seaweed Diets on the Lipid and Fatty Acids of the Japanese Disc Abalone <i>Haliotis discus hannai</i>

Abstract

The effects of seaweed diets on the lipid and fatty acid (FA) composition of juvenile abalone Halio tis discus hannai were investigated by feeding seaweeds with different FA profiles: green (Ulva pertusa, rich in 16:4n-3, 18:3n-3, and 18:4n-3 polyunsaturated fatty acids or PUFAs), red (Grateloupia sparsa, high in 20:4n-6 and 20:5n-3 PUFAs), and brown (Undaria pinnatifida, rich in 18:3n-3, 18:4n-3, 20:4n 6, and 20:5n-3 PUFAs), in a 66-day feeding trial. The best growth was observed in juveniles fed U. pin natifida. None of the seaweed diets affected the major lipid classes of abalone tissues. The PUFAs, 16:4n-3, 20:5n-3, and 22:5n-3 were major FAs of abalone tissues even if these were undetected or found only in very small amounts in the seaweed diet, suggesting their synthesis from dietary n-3 series of low er fatty acids. The poor growth rates were associated with seaweed diets deficient in 18:2n-6, 18:3n-3, 18:4n-3, or 20:4n-6.

Folding versus Self‐Assembling

“…The fatty acid composition of all tissues studied from Jade Tiger hybrid abalone generally reflected that of the feeds. This finding is consistent with other studies on abalone 20, 23, 24, 34. Furthermore, our results demonstrated that a considerable amount of FO can be replaced by FlaxO without largely altering the fatty acid profile.…”

Seasonal variations of total lipid and fatty acid contents in muscle, gonad and digestive glands of farmed Jade Tiger hybrid abalone in Australia

“…These results are consistent with the previous studies on the juvenile hybrid abalone (blacklip  greenlip) (Dunstan et al, 1996), and adult blacklip and greenlip abalone (Nichols et al, 1998;Su, Antonas, & Li, 2004, 2006. Studies on other abalone species also showed similar results (Floreto, Teshima, & Koshio, 1996;Hanna & Sinclair, 1996;Nelson et al, 2002). However the contents of these fatty acids are quite different in the three tissue types.…”

Growth of the abalone Haliotis diversicolor (Reeve) fed with macroalgae in floating net cage and plastic tank

“…The observed highest growth rate at 396-day old (13-month old) was most likely due to age and macroalgal quality. ), and also fed by H. discus hannai (Ino) (Floreto, Teshima & Koshio 1996). However, the negative growth rate at 608-day old (20-month old) might be due to age, and several other factors like proliferation of nuisance and competitor organisms.…”