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Garcia-Vasquez A.,Laboratoire Mixte International Evolution Et Domestication Of Lichtyofaune Amazonienne | Garcia-Vasquez A.,Institute Investigacion Of La Amazonia Peruana | Vargas G.,Laboratoire Mixte International Evolution Et Domestication Of Lichtyofaune Amazonienne | Vargas G.,Institute Investigacion Of La Amazonia Peruana | And 6 more authors.
Journal of Applied Ichthyology | Year: 2015

The present study objective was to determine some of the main life history characteristics of the chiochio, Psectrogaster rutiloides, a heavily fished, yet poorly studied species of the Peruvian Amazon. Over an annual cycle between 2006 and 2007 a monthly sampling of P. rutiloides on the Iquitos market provided a total of 2973 individuals. The species reproduces during the rainy season, during the first part of the flooding period. First sexual maturity is reached at about 2 years of age and 95 mm standard length (SL) for both males and females. Batch fecundity was related to fish size and varied from 59 800 to 149 100 oocytes, with oocytes diameters of 1.34 ± 0.11 mm, valid for females of 141 and 152 mm SL and of 102.9 and 149.6 g body mass, respectively. Females grew faster than males in every age class, a difference gradually increasing from 7% at age one to 10% at age nine, which corresponded to the oldest individuals sampled. Estimated mortality parameters and exploitation rates suggested over-exploitation of the species in the Loreto region. © 2015 Blackwell Verlag GmbH.

Gilles S.,Laboratoire Mixte International Evolution Et Domestication Of Lichtyofaune Amazonienne | Gilles S.,Montpellier University | Gilles S.,Institute Investigaciones Of La Amazonia Peruana Iiap | Ismino R.,Laboratoire Mixte International Evolution Et Domestication Of Lichtyofaune Amazonienne | And 13 more authors.
Animal | Year: 2014

A prototype of an integrated closed system for fish-plankton aquaculture was developed in Iquitos (Peruvian Amazonia) in order to cultivate the Tiger Catfish, Pseudoplatystoma punctifer (Castelnau, 1855). This freshwater recirculating system consisted of two linked sewage tanks with an intensive rearing unit (a cage) for P. punctifer placed in the first, and with a fish-plankton trophic chain replacing the filters commonly used in clear water closed systems. Detritivorous and zooplanktivorous fishes (Loricariidae and Cichlidae), maintained without external feeding in the sewage volume, mineralized organic matter and permitted the stabilization of the phytoplankton biomass. Water exchange and organic waste discharge were not necessary. In this paper we describe the processes undertaken to equilibrate this ecosystem: first the elimination of an un-adapted spiny alga, Golenkinia sp., whose proliferation was favored by the presence of a small rotifer, Trichocerca sp., and second the control of this rotifer proliferation via the introduction of two cichlid species, Acaronia nassa Heckel, 1840 and Satanoperca jurupari Heckel, 1840, in the sewage part. This favored some development of the green algae Nannochloris sp. and Chlorella sp. At that time we took the opportunity to begin a 3-month rearing test of P. punctifer. The mean specific growth rate and feed conversion ratio (FCR) of P. punctifer were 1.43 and 1.27, respectively, and the global FCR, including fish in the sewage part, was 1.08. This system has proven to be suitable for growing P. punctifer juveniles out to adult, and provides several practical advantages compared with traditional recirculating clear water systems, which use a combination of mechanical and biological filters and require periodic waste removal, leading to water and organic matter losses. © The Animal Consortium 2014.

Romer U.,Laboratoire Mixte International Evolution Et Domestication Of Lichtyofaune Amazonienne | Romer U.,University of Trier | Beninde J.,Laboratoire Mixte International Evolution Et Domestication Of Lichtyofaune Amazonienne | Beninde J.,University of Trier | And 15 more authors.
Vertebrate Zoology | Year: 2012

A new species of Apistogramma is described from Peru, based on a total of 51 specimens collected in small forest brooks in and around the Reserva Nacional Allpahuayo Mishana in the drainage of the Nanay river basin about 30 kilometres southwest of Iquitos, Departamento Loreto (approximately 73° 25' W/03° 59' S). Apistogramma allpahuayo sp. n. is distinguished from all other Apistogramma species by the combination of black w-shape marking on lower jaw, (in adult males) lyrate caudal fin, massive jaws and hypertrophied orange lips, distinct roundish caudal-peduncle spot clearly separated from lateral band ending at vertical bar 7, serrated dorsal fin with conspicuous extensions of first membranes, and proportions of dorsal-fin spines differing from those otherwise typical within genus. Apistogramma allpahuayo sp. n. is thought to be a representative of the Apistogramma cacatuoides complex within the Apistogramma cacatuoides lineage. © Museum für Tierkunde Dresden.

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