Shrimp Culture
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Effects of dietary astaxanthin krill oil and high protein krill meal on the growth and survival of post larvae in hyper intensive nursery culture New findings released in September 2020 showed enhanced growth performance of whiteleg shrimp during 51- and 42-day trials at the nursery stage, demonstrating the possibility of a shortened production cycle and reduction in shrimp mortality after transfer to grow-out ponds.
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n shrimp farming, the post larval (PL) stage is an intermediate phase between the larval and juvenile stages. In a single-stage farming model, post larvae, usually at PL9-12, are transferred directly to the growout ponds; while in a 2 or 3-stage farming model with one or two nursery phases, the grow-out usually starts with shrimp with <3g body weight. The duration of the nursery phase is relatively short in the shrimp production cycle, and it is often characterised by an aggressive feeding program, which is typically high in frequency coupled with the use of nutrient-rich diets. The stocking density is quite dense at this stage, which stresses the shrimp significantly. Shrimp stocking density can range from 500-5,000 PL/m3 and end with juveniles between 300mg
and 3g of body weight with a final yield of 1â&#x20AC;&#x201C;3 kg/m3. Once shrimp complete the nursery phase, they are transferred to grow-out farms where they are grown to harvest sizes over a culture duration of 70 days or more. After focussing on juvenile Litopenaeus vannamei and getting to know a lot on the effects of astaxanthin krill oil and krill meal on growth and survival in indoor and outdoor rearing systems under hyper saline rearing conditions, Dr Alberto J.P. Nunes, from the Instituto de CiĂŞncias do Mar, Brazil (Labomar) then turned his attention to the post larval stage. Below, he shares a first-hand perspective on the findings from a recent study on shrimp post larvae.
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January/February 2021 AQUA Culture Asia Pacific
