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Investigaciones marinas

On-line version ISSN 0717-7178

Abstract

VARGAS, Cristian; VALENZUELA, Guillermo; NUNEZ, Sergio  and  ARCOS, Dagoberto. Natural mortality of chilean hake (Merluccius gayi gayi) larvae of central-south Chile in relation to their spatial distribution and patchiness. Investig. mar. [online]. 1996, vol.24, pp.19-30. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71781996002400002.

At the present time limited information is available about ecology and survival of Chilean hake larvae off coast from VIII Region, Chile. Because spatial patchiness of larvae may be an important factor on the predation of fish larvae, its influence on the instantaneous natural mortality of larval Chilean hake (Merluccius gayi gayi Guichenot, 1848) was studied using the mortality-patchiness model (McGurk, 1986). Samples (bongo net 500µ) were taken during a survey carried out in the coastal zone off Central-South Chile (36º22'S _ 37º10'S) during september 1991. The natural mortality for larvae between 4 to 11 mm of standard length fluctuated between 0,1 and 0,38 d-1. The mortality values obtained using the mortality-patchiness model (McGurk, 1986), showed that the spatial distribution (patchiness) would influence the larval mortality, specially in the largest ones (> 9 mm).

Keywords : natural mortality; spatial distribution; patchiness.

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