Document Type

Internship Report

Publication Date

Fall 2014

Abstract

Experimental trials were conducted to evaluate the performance and cost efficiency of a commercial and experimental diet for the maintenance of rotifer (Brachionus plicatilis) cultures. The maintenance of rotifer cultures is an important and essential aspect to commercial marine fish hatcheries. The cost can vary significantly depending on management strategies and type of feeds being used. The rotifer, Brachionus plicatilis, is used as the first live feed source for most marine fish produced through aquaculture. Maintaining mass amount of rotifers, is the first and most basic step necessary for a marine hatchery to operate successfully.

Different feed types will have diverse effects on a rotifer cultures health and performance. In this experimental trial, a high yeast (75%) experimental diet (treatment), and an OriCulture diet (Control) was fed to 2 different tanks over an 8 day period in order to test whether there was a significant difference in growth and fertility rates. The trial was conducted in a commercial setting with a private company, Open Blue Sea Farms, and the facilities available, limited the availability of replicates in the experimental design. Results suggest that the fertility rate of the cultures did not differ significantly (p>0.05). However, there was a significant difference of culture growth rates between the two diets (p<0.05). A cost analysis determined that it costs approximately 3.36 times more to use the OriCulture diet than it costs to use a high yeast diet (excluding shipping costs). Despite the higher maintenance cost, it is not recommended that the OriCulture diet be substituted with the high yeast diet since growth performance of the latter was significantly lower. Additional recommendations are provided to improve Open Blue Sea Farms rotifer protocols.

Comments

Department: MBF

MPS Track: AQU

Location: Open Blue Sea Farms Inc.

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