No abstract

We evaluated the survival and growth of 3-d post-hatch Siamese fighting fish, Betta splendens larvae, raised during 15 d in salt-free or salt-added freshwater (5 ppt using common table salt) and fed with a sequence of traditional live diets (Chlorella sp., rotifers, and Artemia) or with one formulated diet complemented with a single or daily additions of Chlorella. The highest survival were those of natural-fed larvae, at 5 and 0 ppt (100 and 96.67 ± 5.77%), and there were no significant differences in final length and weight, although these were more variable in the case of the larvae maintained at 5 ppt. The use of table salt had a negative effect on the trophonts of the external parasitic dinoflagellate Piscinoodinium sp., which colonized the body surface of the larvae raised at 0 ppt and were absent on those kept at 5 ppt.

Abstract.-The effect on growth and survival of the initial stocking density (30, 20 and 10 eggs L -1 ) in larval rearing of spotted rose snapper (Lutjanus guttatus) was evaluated. The eggs were incubated in nine black fibreglass tanks with three replicates for treatment. Larvae were cultured in the same tanks using the green water technique. Larvae were harvested at 45 days post-hatch (DDE). Total length (LT), weight (PH) and survival rate (S) were determined. Initial stocking density did not affect growth and survival rates. Therefore, it is advisable to carry out larval culture of the spotted rose snapper using 30 eggs L -1 to maintain good growth levels.

huevos utilizando enzima proteolítica proteasa y jugo de piña en la larvicultura del botete diana Sphoeroides annulatus Effect of eggs desticking using protease proteolytic enzyme and pineapple juice in the larviculture of the puffer fish Sphoeroides annulatus

Abstract.-Three prophylactic treatments using three dosages each were used as surface disinfectants in bullseye puffer Sphoeroides annulatus eggs to study their effect on bacterial load reduction and hatching rate. Eggs were treated with proteolytic enzyme to remove stickiness. Tested treatments were: acriflavine