Antecedentes para el cultivo del Puye Galaxias maculatus (Pisces: Galaxiidae)

Sanhueza, Juan Barile; Ramírez, Aliro Bórquez; Dantagnan, Patricio; Lazcano, Alfonso Mardones; Ruíz, Javier Quevedo; Leu, Italo Salgado; Isler, Iván Valdebenito; Aguayo, Rolando Vega

doi:10.7770/956291870x

Cited by 5 publications

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Cultivation of whitebait (Galaxias maculatus) in Chile

2008

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The growth of commercial aquaculture in Chile generated an income of $2.300 million USD in exports in 2005. Currently, 15 different species are cultivated commercially, of which seven are native; these had returns of 185 million USD. Among these native species is Galaxias maculatus (whitebait), which is endemic to Chile and figures significantly in Chilean fishing statistics. Since the 1990s, the School of Aquaculture of the Universidad Catolica de Temuco has been developing cultivation of this native species. This work presents the state of the art of the cultivation of this fish.

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Cultivation of whitebait (Galaxias maculatus) in Chile

2008

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Characterization of whitebait (Galaxias maculatus) respiratory rates to optimize intensive culture carrying capacities

Encina‐Montoya¹,

Vega-Aguayo²,

Mardones-Lazcano³

et al. 2010

Aquaculture Research

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Galaxias maculatus is an osmeriform native fish of the Southern Hemisphere, in which the crystalline larvae is considered as a luxury delicacy, for this reason, it has been commercially exploited in Chile, Argentina and New Zealand. However, the fisheries have been rapidly decreasing due to the overexploitation and the predation of introduced species. Because of these events, there is a need to determine a carrying capacity for an intensive fish culture. In order to optimize stocking densities for fish culture, this paper proposes objectives to determine oxygen consumption (OC) rates, dissolved oxygen concentrations that produce signs of hypoxia and the average time elapsed between food intake and peak OC in G. maculatus. In the oxygen experiments under routine metabolism conditions, we found that G. maculatus adults and whitebait showed signs of asphyxia at dissolved oxygen concentrations between 1.3 and 2.2 mg L−1 and that adults tolerated dissolved oxygen levels as low as 1.3 mg L−1. The results showed that G. maculatus individuals with an average weight of 0.04 g consumed 0.048 mg O2 h−1, whereas individuals with an average weight of 1.4 g consumed 0.345 mg O2 h−1. Galaxias maculatus increased the OC rate by 31%, from 0.39 to 0.51 mg O2 h−1 g−1, occurring 14 min after food intake. The carrying capacities for industrial cultures of G. maculatus, were estimated using an allometric equation (OC=0.2363 ×W0.612), a water flow rate of 1 m3 h−1 and an input oxygen concentration of 10 mg L−1 at 12 °C. The density culture of whitebait (4 g) can be allowed to reach 8–11 kg m−3; therefore, these stocking densities reduce the risk of hypoxia and mortality, ensuring the appropriate growth and feed conversion rates.

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Feeding ω-3 PUFA enriched rotifers to Galaxias maculatus (Jenyns, 1842) larvae reared at different salinity conditions: effects on growth parameters, survival and fatty acids profile

Dantagnan

Bórquez

Pavez

et al. 2016

Lat. Am. J. Aquat. Res.

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Despite the well known importance of ω-3 polyunsaturated fatty acids (PUFA) in marine and freshwater fish larvae, there are few studies on how essential fatty acid requirements and composition on whole body can be altered by changes in water salinity. The present study aimed to determine the effect of salinity on ω-3 PUFA requirements, larval growth survival and fatty acid composition of G. maculatus larvae cultured at two different salinities (0 and 15 g∙L-1) for 20 days while fed rotifers containing two different levels of ω-3 PUFA (1.87 and 3.16%). The results denoted a marked difference in ω-3 PUFA requirements and in the pattern of fatty acid deposition in the whole body of larvae reared at different salinities, depending of ω-3 PUFA in diets. Thus, to improve growth and survival larvae of G. maculatus reared at 0 g∙L-1 require higher levels of ω-3 PUFA, principally 18: 3ω-3. Larvae reared at salinities of 15 g∙L-1 require low levels of ω-3 PUFA for optimal survival, especially 18: 3ω-3. Eicosapentaenoic acid and docosahexaenoic acid content in the whole body of larvae was also affected by water salinity.

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Antecedentes para el cultivo del Puye Galaxias maculatus (Pisces: Galaxiidae)

Cited by 5 publications

References 0 publications

Cultivation of whitebait (Galaxias maculatus) in Chile

Cultivation of whitebait (Galaxias maculatus) in Chile

Characterization of whitebait (Galaxias maculatus) respiratory rates to optimize intensive culture carrying capacities

Feeding ω-3 PUFA enriched rotifers to Galaxias maculatus (Jenyns, 1842) larvae reared at different salinity conditions: effects on growth parameters, survival and fatty acids profile

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