Post Larvae Nursery stage
Preparing post-larvae for strong start in grow-out
Main target in this stage
Strengthening PL before grow-out
At this stage the PL 6-8 or PL 10-12 are moved to a nursery for two weeks, followed by transfer to grow-out ponds or tanks. The key goal is to create optimal conditions for fast growth before transfer to the grow-out ponds/tanks resulting in robust PL with low mortality once transferred.
When to move PL from hatchery to nursery?
Transport from the hatchery to the nursery causes stress. The smaller, the weaker, with a higher potential for mortalities. However, smaller PL are cheaper. Therefore, it is a balance between PL strength and economics. The optimal balance is often at PL 6-10. When moving the PL, make the transfer as comfortable as possible and check water quality before transfer by PCR when possible.
Selecting the right feed for this high growth stage is key
In the nursery commercial feeds are used, which focus on high growth with the correct physical qualities. The feed is fast sinking and water stable for at least 30-60 minutes to avoid nutrient leaching. Selecting the right feeds and correct pellet size is an investment for good size during later grow-out. Health- and immunostimulants plus molting active ingredients often are added to the feeds to promote shrimp health.
Water quality management is key for strong Post Larvae
This phase is crucial for health and survival. At this stage, the PL is still very sensitive to ammonia and fluctuations in their environment. Therefore, continuous aeration, maintaining stable temperature, pH and low levels of ammonia are extremely important. Also measuring salinity in your system is important. With the higher stocking densities and good feeding, ensure sufficient aeration of your nursery tank or pond.
FREQUENTLY ASKED QUESTIONS
Key questions in the post larvae nursery stage
To prevent diseases, maintain good water quality with regular exchanges, probiotics and aeration. Early Mortality Syndrome (EMS) is hard to treat, but effective management helps minimize its impact. White Spot Syndrome Virus (WSSV) is triggered by low salinity and temperatures, so monitoring and adjusting water conditions is crucial to prevent outbreaks. Before stocking PL in the pond, our technical shrimp expert can help to check some PL shrimp disease by PCR.
Check with our shrimp expert for PCR testing