INVESTIGADORES
GARCIA DE SOUZA Javier Ricardo
artículos
Título:
Seasonality effects over the ecological aquaculture of the native zooplanktivorous fish from South America Odontesthes bonariensis
Autor/es:
GARCIA DE SOUZA JAVIER RICARDO; SOLIMANO PATRICIO; MAIZTEGUI TOMÁS; BAIGÚN CLAUDIO RAFAEL MARIANO; CLAPS MARÍA CRISTINA; COLAUTTI DARÍO CÉSAR
Revista:
AQUACULTURE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2017 vol. 471 p. 19 - 27
ISSN:
0044-8486
Resumen:
Ecological aquaculture systems consider the natural and social environments in which they are situated in thesearch to contribute to environmental sustainability. In South America, the aquaculture of the nativezooplanktivorous fish Odontesthes bonariensis (?pejerrey?) has some constraints that could be overcome by applyingextensive culture systems following an ecosystemic approach. This study represents the first attempt todevelop ecological aquaculture in the region. An experiment of extensive cage culture was carried out in La Saladade Monasterio Lake to answer how seasonal changes, both in physico-chemical and zooplankton features, affectthe performance of pejerrey culture. Three successive rearing trials were carried out in spring, summer and autumn.The cages were stocked with pejerrey; whereas others (controls) were left without fish. Lake zooplanktonabundance, biomass and species composition were different among seasons, with maximum abundance meanvalues during summer and maximum biomass mean values during spring. The zooplankton abundance foundin cages without fish was higher than that registered in cages with fish, but no differences in species compositionamong those cages were detected. The pejerrey showed selective feeding habits throughout the entire experiment,and they fed mostly on copepods and cladocerans of N0.7 mm during spring and summer, especiallyafter reaching 4 cm in total length, and on smaller copepods and cladocerans during autumn. The contributionof the different sizes of zooplankton to the gut contents was related to availability and to fish size, and the accessto bigger zooplankton appeared to be a critical factor to promote better growth performance. The bigger fishwere obtained in spring, when zooplankton biomass was maximum in the lake with greater representation oflarge cladocerans, with final fish weight eight times higher than that obtained in summer and fifty times greaterthan that obtained in autumn. The production obtained in spring was one and two orders of magnitude higherthan that found in summer and autumn. The multiple linear regressions selected support the inference that seasonaltemperature and zooplankton variations have effects on pejerrey growth in floating cages. Pampean lakescould be suitable environments to support pejerrey ecological aquaculture, and spring emerges as the better seasonto start an extensive culture that takes advantage of the zooplankton composition and dynamics.Statement of relevance to commercial aquaculture: Alternative tool to overcome constraints in pejerrey culture