Grow out diets
Fishmeal replacement diets are currently being developed and tested around the world. In some cases, plant-based proteins are already replacing substantial amounts of fishmeal (e.g. salmon diets). However, marine finfish diets are still, almost solely based on fishmeal as a protein source. One of the impediments for the use of plant-based proteins is their low attractability, resulting in low ingestion.
Larvae weaning microdiets
Larvae weaning diets are still far from being optimised. Early weaning of marine fish larvae is impeded by the low acceptance of formulated diets. Although, in the past decade, the use of live food and specifically Artemia reduced significantly, it is still in most cases, hard to match performances of formulated weaning diets with live food. Acceptance and ingestion of the diets are usually one of the problems.
THE SOLUTION – better attractability
A new solution is now available to improve the attractability and acceptability of any finfish diets (as well as other marine organisms), whether it is weaning or growout diets. Nutrattract® is a new, innovative (patent pending) attractant, 100% natural and based on Artemia (cultured under unique conditions). It is manufactured using a proprietary and unique process, enabling the preservation of all the natural nutrients that make Artemia such an attractive feed for marine organisms.
Nutrattract® can be coated, vacuum-infused or incorporated into any food particle, pelleted or extruded (usually at 1-3% inclusion). It will not change the diet shelf life. It is available in liquid or powder forms.
Weaning diets with different attractants Yellowtail kingfish (Seriola lalandi) larvae were reared from 14 days post hatch (dph) to 29 dph using one of six experimental microdiets with 4 replicates (3,000 larvae in each tank). A single protocol that progressively excluded live feeds (rotifers and Artemia) was used to wean the larvae onto microdiets. Two attractants were compared in two incorporation methods; krill hydrolysate and Nutrattract® incorporated into the diet or coated over the diet particles. Larvae received Nutrattract® coated microdiet demonstrated signifi cantly higher biomass due to higher survival rates (Kolkovski et al., 2009).
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