King’s College switch to rotifers for zebrafish feeding

When a prominent research center decides that the use of rotifers is more practical for the feeding of their 40,000 zebrafish…

The staff at the zebrafish facility at King’s College London shows that rotifers (Brachionus plicatilis) are sufficient and are better for the growth of zebrafish than used in addition to Brine shrimp (Artemia franciscana). Indeed, by eliminating Artemia sp. in the diet, zebrafish larvae reach 20% faster sexual maturity. This while maintaining a survival rate still high of over 80%.

Data for average nursery survival rates and time spent in nursery of fish fed on Brine Shrimp or Rotifers:
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The new rotifer-based, low-salinity nutritional protocol was implanted in August 2016 for all stages of zebrafish development. A combination of inert and live food is still retained from the juvenile stage. On the other hand, during the embryonic stage, the King’s College team now focuses exclusively on rotifers.

Feeding regimes *before* and *after* the establishment of the new 5 ppt rotifer protocol were as follow:
[table id=8 /]

By reducing the amount of food required for the same nutritional value for zebrafish, the team finally saw a significant saving in labor time and equipment.

Comparison of the weekly costs (spread in %) between materials and labor used for the 5ppt rotifers and brine shrimp at KCL

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