During hatching of larvae of black tiger shrimp or black tiger shrimp and blue shrimp, most of the hatcheries encountered a “sticky” disease of the larvae. The water environment is deteriorating due to algae or their food or stools as a dirty water environment. Many shrimp larvae appear to be sticking together to form lobes that can not swim, fail to catch and die. paste. Footprints occur at all stages of larval rearing, but are more common at the Zoea period.
1. Cause shrimp larvae are stuck to the leg
– Larvae are not treated well before nursing.
– Water is not treated well before being fed into the nursing tank.
– Spirulina feeding too early or uncontrolled algae feeding too much. It was the early feeding of algae that dried too soon when the larvae had not yet migrated to Zoea 1, the excess algae that form the mucus attached to the legs and the larval inserter.
– The feeding of larvae that eat algae is too old or algae does not guarantee quality.
– The use of poor quality feed during nursing.
– The use of poor quality artemia or artemia is not treated well before feeding.
– The management of water environment is not good.
2. How to prevent sticky feet
In order to prevent stickiness in shrimp larvae, it is necessary to well prepare the water and well manage the tank environment during nursing.
– Bathing the larvae prior to placement in the nursing tank to remove dirt from the larvae during incubation.
– Treatment of water before signing up to the tank.
If using dried algae for feeding larvae only be used when the larvae have migrated to the Zoea 1 stage, feed in sufficient quantities to avoid excess. It is best that shrimp at the Zoea stage should be fed to larvae fed with fresh algae, which help larvae catch their prey and do not pollute it.
– Use fresh source of algae to feed quality and not contaminated.
– Must manage the water environment well, can use some useful microorganisms in the decomposition of manure and excess food.
– Periodically siphon and change water to create a clean environment to help shrimp grow best.
3. Treatment when the shrimp stick legs
– Need to reduce the amount of food especially the amount of dry algae.
– Use chemicals to remove dirt on the larvae.
– Change the water from 20 to 50% in combination with microorganism to quickly degrade the dirt and help the beneficial microorganism grow.
– Addition of EDTA 10 – 30 ppm, 1 ppm Vitamin C, 1 ppm Synthetic vitamins help the larvae prevent environmental shock. If the water environment is too bad, dirty water forms a filament, use a catch net to remove dirt from the tank.