Abstract
ABSTRACT: Anomalocardia brasiliana post-larvae were cultured for 28 days to evaluate the effect of stocking density on their growth and survival rate. Three stocking densities were tested 40, 80 and 160 post-larvae cm-2, in experimental units (2-L) with static cultivation system and total water renewal at each 48 hours. The experimental design was completely randomized with three treatments and three repetitions each. Stocking density of 40 post-larvae cm-2 reached 1 mm length within 24 days, while only 18% of the post-larvae at density of 80 post-larvae cm-2 reached 1 mm length in the same time. The density of 40 post-larvae cm-2 had the highest specific growth rate, 4.98±0.08% day-1. The survival rates of post-larvae at lower densities were significantly higher (53.24±4.60% and 52.95±3.32%, on 40 and 80 post-larvae cm-2, respectively) compared to higher stocking density (31.54±0.70%). In the cultivation of A. brasiliana post-larvae, stocking density must be managed during growth. The density of 160 post-larvae cm-2 can only be used until the post-larvae reach 600μm in length, then they should be at 40 post-larvae cm-2 density to keep the maximum daily growth rate.
Highlights
Mollusk production is an important activity within world aquaculture
The present study aimed to evaluate the effect of stocking density on the growth and survival rate of Anomalocardia brasiliana post-larvae in a closed cultivation system
The larvae were fed with a mixture of microalgae, C. calcitrans and Pavlova lutheri, with cells ratio of 1:1 using different algal concentration
Summary
Mollusk production is an important activity within world aquaculture. Not a recent activity, mollusk production still has obstacles such as the lack of proper methodologies for domesticating native species and economic viability of production (FAO, 2018). In Brazil, the main mollusk specie produced is Crassostrea gigas, a temperate oyster that, when grows at high temperatures, growth and survival rates may be compromised (POLI, 2004). The Brazil stands out in the scenario of mollusk production for being the world’s most important producer of the brown mussel Perna perna (~20,000 tones year-1; FAO, 2018). In addition to the production of oysters and mussels, from the 1990s clams aquaculture developed rapidly throughout the world and contributed to the growth of mollusk production (FANG & LIN, 2016). In Brazil, Approved 09.17.19 Returned CR-2019-0420 by the author
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