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Felipe Sepúlveda

Bio: Felipe Sepúlveda is an academic researcher from Andrés Bello National University. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

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TL;DR: In this paper, a trabajo estudio of the habitos alimentarios combinando analisis estomacales and estabilidad isotopica was conducted.
Abstract: El besugo, Epigonus crassicaudus, es una especie de importancia economica para la actividad pesquera que opera en el centro-sur de Chile. A pesar de ello, poco es lo que se conoce respecto a su biologia. En este sentido, este trabajo estudio los habitos alimentarios combinando analisis estomacales y de estabilidad isotopica. Los resultados del analisis dan cuenta de la importancia de los peces mesopelagicos (Myctophidae, Stomiidae) en la dieta con un aporte del 80%, seguido por crustaceos ( Sergestes arcticus ) alcanzando un 10%. No se detectaron diferencias en la dieta en peces con distinto grado de madurez sexual. En tanto, los valores de los isotopos de nitrogeno y carbono mostraron valores de promedio de 17,12 ± 1,1 δ 15N y de -17,51 ± 0,7 δ 13C, respectivamente. La constitucion de valores de δ 13C fue proporcional al tamano corporal de los besugos: individuos de mayor tamano habitan en ambientes mas demersales que ejemplares de menor tamano. De acuerdo a estos resultados, el besugo se situa como consumidor secundario.

4 citations


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TL;DR: The life history parameters estimated in the present study can be used to evaluate possible time variability in maturity and M rates and could be used in stock assessment analysis and to apply effective management measures in the fishery.
Abstract: Reproductive traits and natural mortality rate of cardinalfish females ( Epigonus crassicaudus ) were studied from samples collected onboard commercial fishing vessels, from 2012 to 2015, on the Chilean coast. The reproductive cycles of females analyzed thought gonadosomatic index (GSI) showed a maximum reproductive activity in austral fall, between March and May. Length (L 50% ) and age (A 50% ) at maturity, estimated using a macroscopic scale of the developed ovary, was 22.3 cm fork length (FL) and 9.3 years, respectively. Natural mortality (M) was estimated by two age-related methods. Using maximum age (tmax) M was estimated in 0.063 yr -1 and through age-at-maturity (A 50% ) in 0.15 yr -1 . A potential bias in the reproductive study is discussed when a macroscopic maturity scale is used. Nevertheless, its usefulness is validated when funding is scarce, and time is limited. Although M uncertainty was not evaluated, the estimated range appears to be into the expected values to long-lived species. The life history parameters estimated in the present study can be used to evaluate possible time variability in maturity and M rates. Also, these results could be used in stock assessment analysis and to apply effective management measures in the fishery.

3 citations

Journal ArticleDOI
TL;DR: In this paper, an extensive growth chronology was reconstructed from the annual growth of sagittal otoliths as a proxy for somatic growth for the cardinalfish (Epigonus crassicaudus).

3 citations

Journal ArticleDOI
TL;DR: In this article , the authors analyzed records of fishing logs covering the period 1999-2007 and compared the position of individual fishing hauls (Euclidean distance) applying a hierarchical agglomerative clustering technique.
Abstract: Spatial patterns in fish distribution determine most fishing opportunities and tactics learned by fishers. To determine fishing opportunities and recurrent fishing grounds of deepwater fish such as the cardinalfish (Epigonus crassicaudus) in the south-central zone of Chile, we analyzed records of fishing logs covering the period 1999–2007. Fishing trawls covered from Topocalma (34º06'S) to northwest Corral (39º52'S), and we compared the position of individual fishing hauls (Euclidean distance) applying a hierarchical agglomerative clustering technique. The clusters obtained represented spatially distributed fishing opportunities (n = 28), which were visited occasionally (<10 fishing hauls) or regularly (>50 fishing hauls) to fishing for cardinalfish. The recurrent fishing opportunities (n = 7) were distributed discretely, from Constitución (35°19'S) to northwest Mocha Island (38°23'S) along the continental shelf slope and between 313 and 333 m depth. The species composition in the bycatch and the catch per unit effort trends allow us to identify secondary species and locally depleted fishing opportunities, the last occurring close to main fishing ports.