Efecto de la temperatura en respuestas fisiológicas de la concha de abanico Argopecten purpuratus

Acedo, Jhon Dionicio; Mego, Jorge Flores

doi:10.15381/rpb.v22i3.11439

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Regarding the samples taken in 2017 from June to September, a relatively similar trend was observed, with the highest value found in July. The postclosure increase in 2015 was likely due not only to the lack of fishing activity but also to higher temperatures which cause an increase in physiological processes such as alimentation (Dionicio & Flores 2015) and reproduction (Ansell & Lagard `ere 1980, Manca et al 2002, which could make individuals stay closer to the sediment surface. Later, when the temperature decreases (October and November), larger organisms tend to bury themselves deeper (McLachlan & Defeo 2018), causing a decrease in density and biomass of both total and commercial sizes.…”

Section: Catches and Population Evolutionmentioning

confidence: 99%

The Collapse of a Wedge Clam Fishery in the Spanish Mediterranean Coast and Recovery Problems

Escrivá

Rodilla

Llario

et al. 2021

Journal of Shellfish Research

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In the sandy shores of the Spanish Mediterranean, Donax trunculus (Linnaeus, 1758) has a high commercial interest. In the Gulf of Valencia, poor management of fishing activity led to its closure in June 2015. The objective of this study was to analyze the evolution of the catches of D. trunculus before the closure of the fishery as well as the biomass and density of the population in the months following the closure, plus 2 y later. The area of study was located in the main fishing area of the Gulf of Valencia, which belongs to the fleet of the Gandia FishermenÕs Guild. The fishing beds for this clam are found on sandy sediments in shallow waters (between 0 and 2 m). During the 10 y previous to the fishery closure, the annual catch per unit effort of D. trunculus suffered a sharp decrease, falling from values between 37 and 42 (kg small vessel -1 d -1 ) during the period 2004-2008 to 5.5 in 2014. After the closure, the biomass and density of the wedge clam showed a seasonal pattern, with maximum values in summer, as well as notable differences in densities along the shore in each sampled month. Furthermore, a different size-frequency distribution across depth, with smaller individuals in the shallower areas, was observed. Nevertheless, a general and considerable decline for biomass and density from 2015 (monthly mean of commercial biomass ranged from 24 to 48 kg ha -1 ) to 2017 (from 4 to 13 kg ha -1 ) was noted. This indicates that the closure did not improve the state of the population. There are several hypotheses that could explain this decline such as overfishing, changes in environmental conditions, higher predation (in benthic and planktonic phases), and the reduction of food availability. Therefore, there would be a need to study them in greater depth, as well as to increase the understanding of the spatial dynamics and connectivity of the Donax beds.

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Section: Catches and Population Evolutionmentioning

confidence: 99%

The Collapse of a Wedge Clam Fishery in the Spanish Mediterranean Coast and Recovery Problems

Escrivá

Rodilla

Llario

et al. 2021

Journal of Shellfish Research

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“…The Aquatic Ecophysiology Laboratory extended the studies to fish and bivalves of aquaculture interest. The ingestion rate or clearance rate can be estimated by methods in closed containers (Araya et al, 1993;Tam et al, 2001;Dionisio & Flores et al, 2015) or with continuous flow methods (Riisgard, 1981).…”

Section: Introductionmentioning

confidence: 99%

Efecto de temperatura en las tasas de aclaramiento y de ingestión en Ensis macha (Molina, 1782) “concha navaja”

et al. 2022

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La concha navaja Ensis macha constituye un recurso de importancia comercial en nuestro litoral peruano por su demanda en el exterior. En Huacho los bancos más importantes se ubican en el sur, en el litoral del Promontorio Salinas y La Choza (Playa Grande). El cálculo de Tasa de Aclaramiento (TA) y la Tasa de Ingestión (TI) permite determinar la cantidad de alimento a suministrar a una especie en un determinado tiempo cuando se realiza cultivos en laboratorio; en el medio natural determina la carga máxima de especies a cultivar para no generar impacto en el ecosistema y desarrollar la acuicultura sostenible. En ambiente controlado. se evaluó el efecto de la temperatura en la Tasa de Aclaramiento y la Tasa de Ingestión en individuos de E. macha en diferentes grupos de tallas. Los ejemplares, se agruparon de acuerdo a su talla en: 5,3 ± 0,060; 7,4 ± 0.08 y 10,4 ± 0,10 cm. Se evaluaron dos niveles de temperatura: 16 °C y 21 °C. Se alimentaron con la microalga Chaetoceros gracilis a una concentración de 19x105 células.L-1. Para las pruebas de TA y TI los individuos empleados estuvieron en ayuno durante 24 horas. Los resultados muestran un efecto significativo de la temperatura en la TA y TI sobre ejemplares de tamaño mayor a 7,60 ± 0,14 cm y de 10,53 ± 0,12 cm. Las mayores tasas de aclaramiento y de ingestión se registró a 16 °C con valores promedio de 0,402 L.h-1 y 3,87 cel.h-1, respectivamente y a temperatura de 21 °C los valores de TA y TI fueron menores. Se determinó una relación directa entre la talla de la especie y la TA y TI en los dos niveles de temperatura causando mayor asimilación en su estructura orgánica.

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Efecto de la temperatura en respuestas fisiológicas de la concha de abanico Argopecten purpuratus

Cited by 2 publications

References 10 publications

The Collapse of a Wedge Clam Fishery in the Spanish Mediterranean Coast and Recovery Problems

The Collapse of a Wedge Clam Fishery in the Spanish Mediterranean Coast and Recovery Problems

Efecto de temperatura en las tasas de aclaramiento y de ingestión en Ensis macha (Molina, 1782) “concha navaja”

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