Research Institute for Fisheries and Aquaculture NAIK HAKI

Szarvas, Hungary

Research Institute for Fisheries and Aquaculture NAIK HAKI

Szarvas, Hungary

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Ljubobratovic U.,Research Institute for Fisheries and Aquaculture NAIK HAKI | Kucska B.,University of Kaposvár | Sandor Z.,Research Institute for Fisheries and Aquaculture NAIK HAKI | Peteri A.,Research Institute for Fisheries and Aquaculture NAIK HAKI | Ronyai A.,Research Institute for Fisheries and Aquaculture NAIK HAKI
Iranian Journal of Fisheries Sciences | Year: 2016

Influence of three different stocking densities, Vitamin C supplementation of Daphnia spp. and feeding practice (i.e. mechanical, hand) on the success of dry feed habituation of pond reared pikeperch juveniles was investigated through one month trial. Pond reared pikeperch juveniles were harvested 42 days post-fertilisation (mean individual weight 1.1 ± 0.3g) and stocked into the experimental recirculation system. For the stocking density trial, fish were stocked in three different initial densities of 0.5, 1 and 1.5 fish L-1, while the trial on live food supplementation and feeding practice was performed with two two-group comparisons with one common control treatment. All treatments were performed in 3 replicates. Analysis of variance did not reveal any significant differences in the assessed parameters between the tested stocking densities. However, Pearson correlation for the habituation success was strong in the course of increased density (r2 = 0.829, p = 0.006). Vitamin C supplementation led to increased survival, habituation success and growth, although the differences were not significant (p > 0.05). Similarly, there were no significant differences between the hand and mechanical feeding in the habituation success (p = 0.860). Based on the results of present study and previous results reported for habituation of pikeperch and walleye pond nursed juveniles, stocking densities of 4 to 8 fish L-1, feeding with dry feed with worms supplied manually and possible enrichment with Vitamin C of the given food could be suggested for the successful commercial pikeperch dry feed habituation.


Ljubobratovic U.,Research Institute for Fisheries and Aquaculture NAIK HAKI | Kucska B.,University of Kaposvár | Feledi T.,University of Belgrade | Poleksic V.,University of Belgrade | And 5 more authors.
Turkish Journal of Fisheries and Aquatic Sciences | Year: 2015

The effects of different weaning strategies on survival, cannibalism and growth were investigated in pikeperch (Sander lucioperca) larvae. Two weaning strategies were tested with 15 days post hatch (DPH) larvae: Co-feeding and Supplementary feeding. Co-feeding was performed with Artemianauplii and dry feed by the gradual reduction of nauplii either @ 25% day-1 or 14% day-1, whereas supplementary feeding was performed with sudden weaning to exclusively dry feed while Artemianauplii was the last meal of the day. Each strategy was tested in two time durations, for 4 and 7 days. Co-feeding weaning strategy seems to be more beneficial compare to supplementary feeding weaning strategy in response of lower mortality (%), higher growth and finally maximum total yield. Even though higher cannibalism was found in the larvae weaned for 7 days from 15-22 DPH but higher growth and survival in this group make this weaning strategy better than larvae weaned for 4 days from 15-19 DPH. Therefore, it is concluded that the co-feeding weaning strategy for 7 days from 15 to 22 DPH should be followed for successful larviculture of pikeperch. © Published by Central Fisheries Research Institute (CFRI) Trabzon, Turkey.

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