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Dietary substitution effect of Ulva australis for Undaria pinnatifida on growth, body composition and air exposure of juvenile abalone, Haliotis discus (Reeve 1846)

Ansary, Most. Waheda Rahman, Jeong, Hae Seung, Lee, Ki Wook, Kim, Pil Youn, Kim, June, Yun, Ah-Yeong, Cho, Sung Hwoan, Kim, Tae-Ik
Journal of applied phycology 2019 v.31 no.2 pp. 1467-1474
Haliotis discus, Ulva, Undaria pinnatifida, abalone, air, body composition, cages, experimental diets, juveniles, mortality, specific growth rate, weight gain
Substitution effect of Undaria pinnatifida with Ulva australis in formulated diet on growth, body composition and air exposure of abalone (Haliotis discus) was investigated. A total of 1260 juvenile abalone were distributed into 21 cages. Six formulated diets and dry Undaria were prepared. The control (UA0) diet contained 20% U. pinnatifida. Twenty, 40, 60, 80, and 100% U. pinnatifida were substituted with the same amount of U. australis, referred to as the UA20, UA40, UA60, UA80, and UA100 diets, respectively. Undaria was prepared to compare effect of formulated diet on performance of abalone. Abalone were fed with one of the experimental diets for 16 weeks. After the 16-week feeding trial, abalone were subjected to air exposure for 24 h, and then, cumulative mortality was monitored for the next 4 days. Higher survival, weight gain, and specific growth rate (SGR) were observed in abalone fed all formulated diets than the Undaria. Abalone fed the UA60 diet produced the greatest weight gain and SGR. No difference in proximates of the soft body of abalone was observed. The cumulative mortality of abalone fed the Undaria was higher than all formulated diets at 84 h until the end of the 4-day post observation after 24-h air exposure. Abalone fed the UA0 diet showed higher mortality than other formulated diets at 84 h until the end of the 4-day post observation. In conclusion, U. pinnatifida could be completely replaced with U. australis in abalone feed. The best growth was obtained in abalone fed the UA60 diet.