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2008/786 Evaluation of the suitability of Daphniopsis australis as a live feed for larval Yellowtail Kingfish
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2008/786 Evaluation of the suitability of Daphniopsis australis as a live feed for larval Yellowtail Kingfish



By Matthew Osborne

 

Daphniopsis australis is saline cladoceran found in southern Australia. This study found that D. australis are capable of reaching densities of >500 individuals/L. Due to their high reproductive rate these animals have been identified as a possible live
feed for larval yellowtail kingfish (Seriola lalandi). D. australis were found to be highly effectively at bioaccumulating the essential fatty acids arachidonic acid, eicosapentaenoic acid and linolenic acid from Tetraselmis suecica. Juvenile D. australis contained significantly higher concentrations (P < 0.01) than adult D. australis.

 

Therefore juvenile D. australis would be effective in providing the essential fatty acids to larval finfish. Using the electivity index it was shown that S. lalandi selected juvenile D. australis (E = 0.47) over the commercially used Artemia nauplii (E = -0.93) in a
 selectivity trial. This suggests that D. australis could be useful in a commercial application in the rearing of larval S. lalandi.