Stocking density influences common carp larval development. Can restocking processes activate compensatory growth consequent to previous high stocking density?

• Motta, Jonas H. S. ^[1] ; Glória, Leonardo S. ^[2] ; Polese, Marcelo F. ^[3] ; de Souza, André B. ^[3] ; Neto, Manoel A. C. ^[2] ; Vidal Júnior, Manuel V. ^[2]
  1. [1] Embrapa Pesca e Aquicultura, Palmas - Tocantins, Extension of Av. NS 10, intersection with Av. LO 18 Sentido Norte Loteamento Água Fria, Palmas, TO 77008-900
  2. [2] Northern Fluminense State University Darcy Ribeiro, Agricultural Sciences and Technologies Center (ASTC), Av. Alberto Lamego 2000, Parque California, Campos dos Goytacazes, Rio de Janeiro 28013-602
  3. [3] Federal Institute of Espírito Santo, Rua Augusto Costa de Oliveira, 660, Campus Piúma, Espírito Santo 29285-000

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• Localización: Spanish journal of agricultural research, ISSN-e 2171-9292, ISSN 1695-971X, Vol. 18, Nº. 3, 2020
• Idioma: inglés
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  • Aim of study: to analyse the effect of stocking density on common carp larvae production. Since stocking density is one of the most important variables in recirculating aquaculture system, it is fundamental to understand its implication on fish larval development. Area of study: BrazilMaterial and methods: In an initial trial over a 30-day period, 18,000 Cyprinus carpio larvae were subjected to eight different stocking densities (5, 10, 15, 20, 25, 30, 35 and 40 larvae/L). In a second trial over a 15-day period, the larvae subjected to the 40 larvae/L treatment were selected according to size and 360 of them were subjected to restocking processes at a density of 5 larvae/L, in order to evaluate possible compensatory growth, while those subjected to the 5 larvae/L treatment were likewise selected according to size and were distributed at the same stocking density (5 larvae/L), to be the control treatment during the restocking process.Main results: The larvae kept at the density of 5 larvae/L showed better growth and development. Increased heterogeneity of the concomitant batch was observed with higher stocking density. Restocking at low density (5 larvae/L), for larvae that had previously been kept at high density (40 larvae/L), caused partial compensatory growth, with an increase in the specific growth rate. Increasing the density caused increased productivity up to the density level of 25 larvae/L, but from then on there was no significant difference (p > 0.05).Research highlights: Carp larvae reared at high densities need to be restocked during rearing in order to avoid the “shooting” problem.