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Effects of stocking density on the survival, growth, size variation and condition index of juvenile rabbitfish Siganus rivulatus

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Abstract

Spinefoot rabbitfish, Siganus rivulatus, is an economically important species of herbivorous fish that is relatively easy to rear and thus considered to be suitable for aquaculture. Juveniles are generally reared in nursery systems before being stocked into growout cages or ponds. We report here our evaluation of the effects of stocking density on the survival, growth, feed efficiency and condition index of S. rivulatus juveniles in nursery tanks. The experiment was conducted in a recirculating system of twelve 52-l aquaria connected to a biological filter and a sand filter. Juvenile fish (average weight  6.5 g) were stocked into aquaria at four stocking densities (10, 20, 30, and 40 fish/aquarium) with three replicate aquaria per treatment. Diet was provided at 3% body weight daily divided into two feedings. Fish were weighed weekly for 8 weeks and the diet increased accordingly. Survival was greater than 95% in all treatments, with no significant differences observed among treatments. There were also no differences in specific growth rate (SGR 2.12–2.27) of the fish among treatments. Growth rate was linear during the 8 weeks in all treatments, and harvested biomass increased proportionally to stocking density (198, 401, 600 and 785 g per increasing stocking density, respectively). Feed efficiency (FE 0.67–0.71) of the fish did not vary significantly among treatments. The coefficient of variation was high (35–41%) among the harvested fish, but it also did not differ significantly among treatments. The final condition indices of the fish in all treatments were similar to each other but significantly greater than the initial values (P < 0.05). The results suggest that there is no apparent effect of stocking density at the levels tested on the survival and growth of juvenile rabbitfish.

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Acknowledgements

Special thanks are extended to the Lebanese National Center for Scientific Research for funding the project.

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Authors and Affiliations

  1. Department of Biology, American University of Beirut, Bliss Street, Beirut, Lebanon

    I. Patrick Saoud, Joly Ghanawi & Nada Lebbos

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  1. I. Patrick Saoud
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  2. Joly Ghanawi
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  3. Nada Lebbos
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Correspondence to I. Patrick Saoud.

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Saoud, I.P., Ghanawi, J. & Lebbos, N. Effects of stocking density on the survival, growth, size variation and condition index of juvenile rabbitfish Siganus rivulatus . Aquacult Int 16, 109–116 (2008). https://doi.org/10.1007/s10499-007-9129-7

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  • DOI: https://doi.org/10.1007/s10499-007-9129-7

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