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No abstract

The quality of brands of Artemia cysts should be expressed on a weight basis, namely the number of live nauplii hatching out per unit of weight of product and not as a “hatching percentage” since the latter concept does not take into account the degree of impurity of the material. A standardized method for the determination of the hatching efficiency is proposed. A new methodology for cyst processing has been worked out at laboratory scale, based on a 2‐step cleaning (brine and tap water) followed by dehydration (air or brine) or decapsulation and dehydration (brine).

A rtemia R e fe r e n c e C e n te r . S t a t e U n iv e r s ity o f G h e n t. J. P la te a u s tr c a t 2 2 , B -9 0 0 0 G h e n t, B e lg iu m A B S T R A C T A m o d ifie d filte r sy s te m is d e sc rib e d f o r th e in te n siv e c u ltu rin g o f A rtem ia in a c o n tin u o u s ly ren ew e d m e d iu m . E x tra p o la te d to a I m 3 ta n k, 2 5 k g liv e w e ig h t Artemia c o u ld b e p ro d u c e d o ver a c u ltu re p e rio d o f tw o w ee k s o n a d ie t o f m ic r o n iz e d a n d d e fa tte d rice bran u sin g th e sa lt en rich e d e fflu e n t o f an a b a n d o n e d g e o th e r m a l w e ll as us ;A q u a c u ltu r a l E n g in e e r in g 0 1 4 4 -8 6 0 9 /8 2 /0 0 0 1 -0 1 1 5 /$02.75

Of the various algae grown in the St. Croix Mariculture System, the diatom Chaetoceros curvisetus (clone STX‐167) proved to be an excellent diet for culturing Artemia nauplii and adults. The minimum cell concentration at which Artemia can efficiently remove cells has been determined and appears to be constant throughout the brine shrimp' life cycle. The cell stripping efficiency, growth rate, and survival of the different larval instar stages have been studied in function of increased stocking densities and flow rates. The results obtained in 230‐liter raceway tanks, subsequent to the initial 190‐liter tank studies, and extrapolated to a one m3 system indicate that 15 g of cysts (4/ml animal stocking density) can be converted into 8.7 kg of fresh weight adult Artemia in 14 days.