Miguel Araya

Arturo Prat University · Departamento de Ciencias del Mar

The parental care of the nests and the embryonic and larval development of the labrisomid blenny Labrisomus philippii (Teleostei: Labrisomidae) were described for the first time. In situ underwater recordings were done on nests deposited at 2‐m depth at Pisagua and Sarmenia, northern Chile. The nests were composed by a mass of adhered eggs, exclusi...

The age and growth of fish populations is a critical issue for stock assessment, population dynamics and fishery management. Spawner biomass, mortality, growth, recruitment and age at maturity can be misconstrued if the age estimator is inaccurate. Age can be estimated by annuli count, but this requires expertise and is expensive. Otolith weight (O...

Aplicar un enfoque holístico para evaluar los factores asociados a la sobrevivencia en los estadios tempranos de anchoveta y su relación con los forzantes ambientales en áreas recurrentes de crianza entre las regiones de Arica y Parinacota y Antofagasta, considerando la variabilidad espacio temporal de la zona. Objetivo específico 1: Caracterizar...

Obbjetivo General: Aplicar un enfoque holísico para evaluar los factores asociados a la sobrevivencia en los estadios tempranos de anchoveta y su relación con los forzantes ambientales en áreas recurrentes de crianza entre las regiones de Arica y Parinacota y Antofagasta, considerando la variabilidad espacio temporal de la zona.

Growth in fishes is usually modelled by a function encapsulating a common growth mechanism across ages. However, several theoretical works suggest growth may comprise of two distinct mechanistic phases arising from changes in reproductive investment, diet or habitat. These models are termed two-state or biphasic, where acceleration in growth typica...

In habitats impacted by bottom trawling that influences the resilience of few and widely distributed abundant species, it is relevant to analyze how populations are structured according to their niche and niche overlap, and hence contributing to the ecosystem-based management approach. We evaluated and compared the isotopic niche width and determin...

The estimation of age on a fish by using the otolith weight is a quick and low‐cost technique, yet controversial despite separate researchers worldwide have proved successfully its application. A systematic review was conducted including 47 publications containing 289 data points where the relationship between the age and otolith weight was assesse...

Coastal marine upwelling famously supports elevated levels of pelagic biological production, but can also subsidise production in inshore habitats via pelagic-benthic coupling. Consumers inhabiting macroalgae-dominated rocky reef habitats are often considered to be members of a food web fuelled by energy derived from benthic primary production; con...

A partir del análisis crítico de aspectos biológicos, ecológicos, ambientales y pesqueros, se resumen las brechas de conocimiento, problemas y desafíos en anchoveta en Chile. Los productos de este Taller conllevan a la priorización de la investigación en aspectos básicos de la historia de vida, principalmente relacionados con el pronóstico del recl...

The optimal culture conditions in broodstock management of Psetta maxima allow obtaining better quantity and quality of eggs and viable larvae, increasing the production. In order to evaluate the optimal conditions the specimens kept under culture conditions were used, in a period of 3-24 months of life, thus forming a broodstock stock. At the end...

The optimal culture conditions in broodstock management of Psetta maxima allow obtaining better quantity and quality of eggs and viable larvae, increasing the production. In order to evaluate the optimal conditions the specimens kept under culture conditions were used, in a period of 3-24 months of life, thus forming a broodstock stock. At the end...

The mortality rate in embryonic and larval stages of marine fish is associated with the success of a culture, being necessary to optimize the procedures from this to the level of embryonic development and early larval stages for an optimal larval survival and better juvenile production. In order to evaluate temperature effect on embryonic and larva...

The mortality rate in embryonic and larval stages of marine fish is associated with the success of a culture, being necessary to optimize the procedures from this to the level of embryonic development and early larval stages for an optimal larval survival and better juvenile production. In order to evaluate temperature effect on embryonic and larva...

The influence of water temperature (17 and 20°C), frequency (4 and 6) and feed ration level (2.5% and 3.5%) on the growth and survival of juvenile turbot (Psetta maxima) in a commercial productive system was investigated over 35 days. The results indicate that fish from the experimental protocol exhibited better growth and significant difference in...

The influence of water temperature (17 and 20 degrees C), frequency (4 and 6) and feed ration level (2.5% and 3.5%) on the growth and survival of juvenile turbot (Psetta maxima) in a commercial productive system was investigated over 35 days. The results indicate that fish from the experimental protocol exhibited better growth and significant diffe...

There is evidence for interspecific correlations among population parameters in fish. Such correlations have been described from parameters including those produced through the von Bertalanffy model, natural mortality, age and length at maturity. The correlations have been used as practical tools to predict the dynamics and life history characteris...

There is evidence for interspecific correlations among population parameters in fish. Such correlations have been described from parameters including those produced through the von Bertalanffy model, natural mortality, age and length at maturity. The correlations have been used as practical tools to predict the dynamics and life history characteris...

The instantaneous natural mortality rate is estimated for toothfish (Dissostichus eleginoides) using empirical models, with the emphasis on an evaluation of the precision of the estimates. The results are compared with estimates obtained per age classes and obtained through an analytical model. The growth parameters and the size at first maturity a...

The instantaneous natural mortality rate is estimated for toothfish (Dissostichus eleginoides) using empirical models, with the emphasis on an evaluation of the precision of the estimates. The results are compared with estimates obtained per age classes and obtained through an analytical model. The growth parameters and the size at first maturity a...

It is often assumed that the von Bertalanffy growth model (VBGM) is appropriate to describe growth in length-at-age of elasmobranchs. However, a review of the literature suggests that a two-phase growth model could better describe growth in elasmobranchs. We compare the two-phase growth model (TPGM) with the VBGM for 18 data sets of elasmobranch sp...

Is the otolith weight (OW) of Patagonian grenadier, Macruronus magellanicus, useful for estimation of age? This question is addressed analyzing the otolith mass growth rate through both monthly otolith weight–frequency data (OWFD) and the relationship between OW and observed age. Samples were obtained from the purse-seine fishery in spring and summ...

The feeding and trophic relationships of the fish species from the coastal zone of northern Chile were analyzed. The analysis was carried out considering the relative importance of the preys, diversity and inter-specific trophic superposition. A total of 632 individuals belonging to 16 species were collected through dive during the period between M...

The feeding and trophic relationships of the fish species from the coastal zone of northern Chile were analyzed. The analysis was carried out considering the relative importance of the preys, diversity and inter-specific trophic superposition. A total of 632 individuals belonging to 16 species were collected through dive during the period between M...

The frequency of microincrement formation in sagittae otoliths of jack mackerel Trachurus symmetricus was validated using experiments on captive fish. Adult jack mackerel were injected with a dose of 100 mg of oxytetracycline/kg of fish. A second injection was performed 30 days later. The fish were then sacrificed and their sagittae otoliths were e...

The frequency of microincrement formation in sagittae otoliths of jack mackerel Trachurus symmetricus was validated using experiments on captive fish. Adult jack mackerel were injected with a dose of 100 mg of oxytetracycline/kg of fish. A second injection was performed 30 days later. The fish were then sacrificed and their sagittae otoliths were e...

The individual fish growth history is recorded in the marks of hard structures, such as otoliths, scales, vertebrates, bones and rays. The retrospective analysis or back-calculation is a technique that allows to use this information to estimate body dimensions at previous ages or stages in the fish life history. This is achieved by using relationsh...

The relationship between age and otolith weight was examined in the Chilean jack mackerel, Trachurus symmetricus murphyi (Nichols). The purpose was to present evidence for the relationship in order to obtain a rapid and inexpensive method of ageing individuals of T. s. murphyi. The evidence of the otolith age–weight relationship is presented accord...

The instantaneous gastric evacuation rate for Trachurus symmetricus murphyi of northern Chile, was experimentally determined. The specimens were transported in bins from the fishing area to port of Iquique, aboard a purse-seine vessel. Later, they were placed separately in cages inside a fishpond. Fish specimens (16.5 to 24 cm FL) were then starved...

In order to know the periodicity and the moment of first growth microincrement formation in the sagitta otolith of pejerrey larvae (Austromenidia regia) were maintained in the laboratory for 26 days. The photoperiod and temperature were maintained constant. Larvae were fed ad libitum with plankton, artificial food for fishes and Artemia sp. nauplii...