Abstract
Sharpsnout seabream Diplodus puntazzo has been successfully introduced in Mediterranean aquaculture for reasons of species diversification. However, there is limited information related to specific rearing conditions that the species may require for production optimization in land-based aquaculture. The aim of the present study was to investigate the combined effects of rearing density and background colour on growth performance of sharpsnout sea bream D. puntazzo reared in a recirculating water system. Juveniles (4.0 ± 0.03 g) were reared (duplicated groups) under low (D 16 fish tank−1 or 1 kg m−3) and high (3D 48 fish tank−1 or 3 kg m−3) density in white, light blue and black tanks for 88 days. During the first 53 days of rearing, fish under low density presented better growth than fish under high density. However, in the following period (days 53–88) SGR in 3D-reared fish was significantly higher than in D-reared fish, resulting in no mass differences on day 88. Regardless of rearing density effects, black tanks had a negative effect on growth and should be avoided in sharpsnout sea bream rearing. Within the life stage studied, present growth results, along with those of fish groups homogeneity (coefficient of mass variation, frequency distribution of mass), indicate a change in social interactions according to body size. It is suggested that juvenile sharpsnout seabream should be stocked at low density until they reach approximately 16 g. Afterwards, a higher density seems more appropriate for this species while it also ensures a higher productivity.
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We would like to thank Mr. Giorgos Konstantinou and Mr. Xenophon Vrettos for their technical and laboratory assistance and to Mr. J. Stefanis for providing the fish.
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Karakatsouli, N., Kassianos, N. & Papoutsoglou, S.E. Effects of rearing density and tank colour on juvenile sharpsnout seabream (Diplodus puntazzo) growth performance. Aquacult Int 23, 943–953 (2015). https://doi.org/10.1007/s10499-014-9853-8
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DOI: https://doi.org/10.1007/s10499-014-9853-8