Distribucion, batimetria y alimentacion de epigonus crassicaudus de buen, 1959 (perciformes: epigonidae) en la costa de chile
01 Jan 2009-Gayana (Universidad de Concepción. Facultad de Ciencias Naturales y Oceanográficas.)-Vol. 73, Iss: 1, pp 95-101
TL;DR: In this paper, the authors study the distribucion batimetrica y latitudinal of besugo (Epigonus crassicaudus) in la costa de Chile, analysing the registros de la pesqueria and a traves de información complementaria recopilada desde los lances de pesca realizados in la evaluacion directa de merluza comun.
Abstract: Se estudio la distribucion batimetrica y latitudinal de besugo (Epigonus crassicaudus) en la costa de Chile analizando los registros de la pesqueria y a traves de informacion complementaria recopilada desde los lances de pesca realizados en la evaluacion directa de merluza comun. Adicionalmente, se reportan antecedentes sobre los habitos alimenticios de besugo a traves de analisis del contenido estomacal de ejemplares recolectados en la zona central de Chile. Segun la informacion de la actividad comercial, el recurso concentraria su distribucion entre Valparaiso (33°04'S) y Puerto Montt (41 °46'S). Sin embargo, el crucero de evaluacion, registra capturas positivas de besugo desde su limite norte de operacion (29°00'S). En relacion a la batimetria, tanto la frecuencia de lances positivos como la captura, mostraron un patron coincidente en ambas fuentes de informacion, evidenciando una concentracion del recurso en el rango de profundidad de 300 a 400 m. Respecto de la alimentacion, las presas mas consumidas por E. crassicaudus fueron organismos planctonicos representados por eufausidos y estomatopodos. Apareciendo ocasionalmente algunos componentes del bentos en su dieta. Los resultados del presente estudio sugieren que E. crassicaudus presentaria habitos migratorios desde el pelagos al bentos, determinado por la oferta ambiental de alimento, concentrando su distribucion sobre la plataforma y talud continental. Ademas se confirmo una distribucion latitudinal mas amplia del recurso de la reconocida a traves de informacion exclusiva de la pesqueria.
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TL;DR: In this paper, the sagitta otolith transversal sections of the cardinalfish Epigonus crassicaudus were used to determine the maximum age to be 15 years old.
Abstract: The cardinalfish Epigonus crassicaudus is a deep-demersal fish with commercial importance for the trawl fishery operating off central Chile. Previous analysis in age assignment, based on the whole otolith, determined the maximum age to be 15 years old. Although scarce data is available for the genus, other congeneric species might live up to 100 years. Using sagitta otolith transversal sections, we determined age to 1277 fish collected in central Chile between January and December 2008. Longevity was determined in 54 years old.
8 citations
01 Jun 2017
TL;DR: In this article, the authors describe the patterns of spatial distribution and size structure of Coelorinchus caelorhincus in deep-sea waters of Colombian Caribbean.
Abstract: The objective of the study is to describe the patterns of spatial distribution and size structure of Coelorinchus caelorhincus in deep-sea waters of Colombian Caribbean. The samples were collected with trawling in depths between 200 and 550 m. Statistically significant differences in the sizes of the sexes were found, indicating sexual dimorphism. The length structure by depth strata showed a size increase with depth for both females and males. The length at sexual maturity in females was 17.238 cm TL. The spatial distribution indicates that in the northeastern area the higher aggregations were off the coast of the Magdalena River, off Santa Marta and Riohacha cities. In the southwestern area the higher aggregations were towards the northern part of the Urabá Gulf.
4 citations
TL;DR: The spatial distribution patterns of biomass, size structure and morphometric relationships of E. occidentalis and E. pandionis in deep waters of the Colombian Caribbean Sea are described to determine basic life history traits, such as growth, reproduction, recruitment, and mortality.
Abstract: Cardinal fish are commercially valuable species. In the Colombian Caribbean Sea E. occidentalis and E. pandionis occurred in 37and 35% of tows during a research trawl survey (>200 m), respectively and the biology of these vulnerable species is unknown. The aim of this work is to describe the spatial distribution patterns of biomass, size structure and morphometric relationships of E. occidentalis and E. pandionis in deep waters of the Colombian Caribbean Sea. The samples were collected by trawling in depths between 200 and 550 m. No statistical differences were found in size by sexes in both species. In female and male E. occidentalis the growth was isometric, while in female and male E. pandionis it was positive allometric. E. occidentalis occurred mainly in the northern zone of Colombian Caribbean Sea, with highest aggregations off Santa Marta and Riohacha. E. pandionis was distributed in the northern area between Santa Marta and Riohacha and in the southern area between Cartagena and Morrosquillo Gulf. However, before the exploitation of these species is considered, further research is required to determine basic life history traits, such as growth, reproduction, recruitment, and mortality.
4 citations
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
TL;DR: Age and growth parameters were estimated for the deep-sea cardinalfish from sagittal otoliths collected between 2012 and 2015 onboard commercial fishing vessels from the South-east Pacific off Chile between 33°04′S and 41°46′S.
Abstract: Age and growth parameters were estimated for the deep-sea cardinalfish (Epigonus crassicaudus) from sagittal otoliths collected between 2012 and 2015 onboard commercial fishing vessels from the South-east Pacific off Chile between 33°04′S and 41°46′S. Von Bertalanffy growth parameters (VBGP) were estimated from assumed annual otolith growth zone counts. The verification of the first annulus of sagittal otoliths was determined by examining in detail daily micro-increments. These data helped inform the interpretation of the annual growth zones from transverse otolith sections. The von Bertalanffy growth model estimated to length-at-age data were asymptotic length (L∞) of 34.1 cm fork length (FL), a growth coefficient (k) of 0.1 cm/year and a t-zero (t0) of −0.85. The maximum ages observed were 67 and 65 years for female and male fish, respectively.
3 citations
References
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TL;DR: In this article, the authors investigated food habits of albacore, Thunnus alalunga, bluefin tuna, thynnus, and bonito in the eastern North Pacific Ocean during 1968 and 1969.
Abstract: The authors investigated food habits of albacore, Thunnus alalunga, bluefin tuna, Thunnus thynnus, and bonito, Sarda chiliensis, in the eastern North Pacific Ocean during 1968 and 1969. While most stomach samples came from fish caught commercially off southern California and Baja California, some came from fish taken in central California, Oregon, and Washington waters. Standard procedures included enumeration of food items, volumetric analysis, and measure of frequency of occurrence. The authors identified the majority of forage organisms to the specific level through usual taxonomic methods for whole animals. Identification of partially digested animals was accomplished through the use of otoliths for fish, beaks for cephalopods, and the exoskeleton for invertebrates. A pictorial guide to beaks of certain eastern Pacific cephalopods was prepared and proved helpful in identifying stomach contents. This guide is presented in this publication. The study indicates the prominent forage for bluefin tuna, bonito, and albacore in California waters is the northern anchovy, Engraulis mordax.
1,535 citations
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TL;DR: The work on which this paper is based began as a study of the food of fresh-water stickleback, but it also became possible to study thefood of roach from the stream in which most of the sticklebacks were collected, and so to examine theFood of an entire community of fishes.
Abstract: The work on which this paper is based began as a study of the food of fresh-water stickleback (section C). In the course of this work it became desirable to review the methods in common use for studying the food of fishes (section B). It also became possible to study the food of roach from the stream in which most of the sticklebacks were collected, and so to examine the food of an entire community of fishes (section D). The various sections, which are closely inter-related, have been placed in their logical order, but some forward references have been unavoidable.
1,150 citations
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TL;DR: The validity, reliability and practicability of different methods for the investigation of stomach contents of a small, plankton-eating fish are discussed and a logarithmic version of Shorigin's index is proposed as a replacement for Ivlev's food selection index.
Abstract: The validity, reliability and practicability of different methods for the investigation of stomach contents of a small, plankton-eating fish are discussed. Tests demonstrated the problems related to mass and volume measurements of planktonic food. Several nutrition indices, particularly Hynes's “frequency of occurrence” are criticized. A logarithmic version of Shorigin's index is proposed as a replacement for Ivlev's food selection index. A preliminary study on the food of Gobiusculus flavescens (Fabricius), sampled in July, 1975 at Helgoland, provides some numerical information on the composition of its stomach contents and food preference.
344 citations