|Comparative growth of Pacific oyster (Crassostrea gigas) postlarvae with microfeed and microalgal diets|
|Badillo-Salas, C.E.; Valenzuela-Espinoza, E.; González-Gómez, M.A.; Pares-Sierra, G.; Ley-Lou, F.; Garcia-Esquivel, Z. (2009). Comparative growth of Pacific oyster (Crassostrea gigas) postlarvae with microfeed and microalgal diets. Aquacult. Int. 17(2): 173-186. dx.doi.org/10.1007/s10499-008-9189-3|
|In: Aquaculture International. Springer: London. ISSN 0967-6120, more|
Diets; Feeding; Growth; Oysters; Post larvae; Crassostrea gigas (Thunberg, 1793) [WoRMS]; Marine
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Two trials were carried out in the laboratory in order to assess the effect of microparticulated feed (F) and live (Thalassiosira pseudonana , M) diets on the growth of recently set (396 ± µm shell height) and 2 mm Crassostrea gigas postlarvae. Different proportions of M and F (100:0, 75:25, 50:50; 25:75, 0:100) were delivered in a single dose of 3 h d-1 in trial 1. Dietary M:F proportions of 100:0, 50:50, and 0:100 were delivered as a single pulse of 8 h d-1 (P1) or two pulses of 4 h-1 (P2) in trial 2. Maximal daily M ration was 296 cells µl-1d-1 (trial 1), 150 M cells µl-1d-1 (trial 2), or their equivalent F dry weight. Shell height (SH), dry (DW), and organic weight (AFDW) were evaluated weekly. Oysters from trial 1 significantly increased their size after 28 days, and exhibited no significant dietary differences in terms of DW (1.21 ±0.15 to 2.01 ± 0.28 mg) or AFDW (0.091 ± 0.022 to 0.166 ± 0.022 mg). Newly set postlarvae (trial 2) also exhibited significant growth after 25 days. No dietary differences were observed in trial 2, yet P2 oysters attained significantly higher shell heights (825-912 µm) than P1 oysters (730-766 µm) after 25 d. Pulse effects were marginally not significant in terms of AFDW and growth rate. Together, these findings showed that balanced microfeeds have a practical potential for the culture of early C. gigas postlarvae, when they are delivered in pulse-feeding schemes.