Effect of stocking density on growth, survival and development of aspAspius aspius(L.), ideLeuciscus idus(L.) and chubLeuciscus cephalus(L.) larvae during initial rearing under laboratory conditions

Abstract

This study was aimed at determining the effect of stocking density on growth, survival and development of asp Aspius aspius (L.), ide Leuciscus idus (L.) and chub Leuciscus cephalus (L.) larvae, reared under laboratory conditions. Fish larvae were obtained during artificial reproduction. The larvae were fed ad libitum with freshly hatched Artemia sp. nauplii. Eight density variants from 50 to 400 individuals per 1 L (at the interval of 50 individuals L -1 ) were tested. The initial rearing was carried out for 21 days at 25°C in a recirculation system especially designed for that purpose consisting of 16 tanks with a capacity of 1 L each. The fastest growth rate for all three species, expressed as the greatest average total length, weight and most advanced ontogenetic stage at the end of the experiment was obtained at the lowest stocking density. Fish from other treatments, particularly at densities exceeding 150 individuals L -1 , were characterized by similar body sizes and the same ontogenetic stage on the last day of rearing. The recorded differences in the length of larvae among treatments became visible during the first (asp) or third (chub, ide) week of rearing. No effects of stocking density on larval mortality were found during the experiment.

Influence of Water Salinity on the Growth and Survivability of Asp Larvae Leuciscus aspius (Linnaeus, 1758) under Controlled Conditions

“…In order to keep asp populations on a satisfying level, thus meeting anglers’ expectations, it has become necessary to design protocols for the rearing of asp larvae to intensify the production of stocking material of asp and to enhance its populations in natural water bodies. While developing methods for the production of stocking material, the following factors that influence the growth and survivability of fish larvae are most often taken into consideration: type of feeds, water temperature and density of larvae [ 25 , 26 , 27 , 28 , 29 ]. In contrast, the effect of water salinity on the growth and survivability of asp larvae has not been investigated so far.…”

Stocking density effect on survival and growth of early life stages of maraena whitefish, Coregonus maraena (Actinopterygii: Salmoniformes: Salmonidae)

“…High survival in all groups indicates that high-density aquaculture may be suitable for the production of this species. This phenomenon was also seen in Kupren et al (2011) for asp, Leuciscus aspius (Linnaeus, 1758); ide, Leuciscus idus (Linnaeus, 1758); and chub, Squalius cephalus (Linnaeus, 1758).…”

Artificial Reproduction of Blue Bream (Ballerus ballerus L.) as a Conservative Method under Controlled Conditions

“…Gametes can be obtained from them without such stimulation only when they are caught at a spawning site during the spawning [ 44 ]. Research into blue bream reproduction under controlled conditions following hormonal stimulation was based on studies of the bream Abramis brama [ 13 , 14 ] and rheophilic cyprinids [ 12 , 16 , 17 , 18 , 19 , 20 ]. Similarly to blue bream, these fish must be caught in the wild before their reproduction under controlled conditions.…”

“…The research conducted thus far has facilitated the implementation of the developed technologies in fishing practice. This has increased stocking with such biologically valuable species as the asp Leuciscus aspius , the ide Leuciscus idus , the common rudd Scardinius erythrophthalmus , the dace Leuciscus leuciscus , the common bream Abramis brama and the burbot Lota lota [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Maintaining the population sizes of low-economic value fish at an appropriate level ensures sufficient feed for such fish as the pike Esox lucius and the European catfish Silurus glanis .…”