Escape mortality of trawl caught Baltic cod (Gadus morhua) — the effect of water temperature, fish size and codend catch

Suuronen, Petri; Lehtonen, Esa; Jounela, Pekka

doi:10.1016/j.fishres.2004.08.022

Cited by 56 publications

(68 citation statements)

References 8 publications

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“…Thus, an alternative explanation of the lower survival rates in winter months, particularly among smaller fish, is the lower swimming ability due to lower water temperatures (He andWardle 1988, Özbilgin andWardle 2002). There is some controversy about this aspect: Düzbastılar et al (2010a) found that the mortality of brown comber escaping from diamond-mesh codends was not affected by water temperature (13°C and 25°C); conversely, Suuronen et al (2005) observed lower mortality of cod at lower water temperatures (<10°C compared with >15°C).…”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in mortality of red mullet (Mullus barbatus) escaping from codends of three different sizes in the Aegean Sea

Düzbastılar¹,

Breen²,

Aydın³

et al. 2017

Sci. Mar.

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Summary:This study was performed off the southern coast of Yassıca Island in the İzmir Bay on the Turkish coast of the Aegean Sea to investigate the mortality of red mullet (Mullus barbatus, Mullidae) escaping through 40-mm square-mesh and 44-and 50-mm diamond-mesh codends attached to a conventional demersal trawl net. In total, 48 replicate experimental hauls were performed in the summer and winter of 2011 and 2012. Mean escape mortality for all hauls in winter (33.2%±6.51) was significantly higher (p<0.0001) than that in summer (26.5%±6.19). Furthermore, mortality was also highest among the smallest fish, particularly during winter. Irrespective of season, the escape mortality of red mullet was lowest from the 40-mm square-mesh codend (mean, 25.5%±4.58). These observations emphasize the importance of investigating the survival potential of escaping fish when considering the benefits of different selective devices in the management of a fishery.Keywords: escape mortality, bottom trawl, size-related mortality, seasonal variation, mesh size, mesh shape, Aegean Sea.Variación estacional en la mortalidad post pesca del salmonete (Mullus barbatus), capturado con arrastre de fondo en el mar Egeo Resumen: El estudio se llevó a cabo frente a la costa sur de la isla de Yassica en la Bahía de Izmir, costa turca del mar Egeo para investigar la mortalidad post captura del salmonete (Mullus barbatus, Mullidae) que escapa de las redes de pesca con copos de malla cuadrada de 40 mm, y romboidales de 44 y 50 mm acoplados a una red tradicional de arrastre demersal. En total, se realizaron 48 lances experimentales durante el verano e invierno de 2011 y 2012. La media de la mortalidad post captura para todos los lances en invierno (33.2%±6.51) fue significativamente mayor (p<0.0001) que en verano (26.5%±6.19). Además, la mortalidad fue más alta entre los individuos más pequeños, especialmente en invierno. Independientemente de la estación, la mortalidad post captura del salmonete fue inferior con el copo de luz de malla cuadrada de 40 mm (media, 25.5%±4.58). Estas observaciones ponen de manifiesto la importancia de la investigación de la supervivencia potencial de los peces que escapan de las redes de pesca a la hora de considerar los beneficios de distintos dispositivos selectivos en la gestión de una pesquería.Palabras clave: mortalidad post captura, arrastre de fondo, mortalidad dependiente de la talla, variación estacional, luz de malla, forma de la malla, mar Egeo.Citation/Como citar este artículo: Düzbastilar F.O., Breen M., Aydin C., Özbilgin H., Özgül A., Ulaş A., Metin G., Gül B., Lök A. 2017. Seasonal variation in mortality of red mullet (Mullus barbatus) escaping from codends of three different sizes in the Aegean Sea. Sci. Mar. 81(3): 339-349. doi: http://dx

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Section: Discussionmentioning

confidence: 99%

Seasonal variation in mortality of red mullet (Mullus barbatus) escaping from codends of three different sizes in the Aegean Sea

Düzbastılar¹,

Breen²,

Aydın³

et al. 2017

Sci. Mar.

View full text Add to dashboard Cite

show abstract

“…The water temperature was 13 and 24ºC around the cages for winter and summer experiments, respectively. Although there was high variation between hauls, Suuronen et al (2005) observed that lower mortality of cod was at lower water temperatures (<10°C), and higher mortality was at higher temperatures (>15°C). In common, low water temperatures may cause decreasing swimming ability and increasing the vulnerability to various capture stresses.…”

Section: Discussionmentioning

confidence: 86%

“…For this reason, investigating the survival probability of escaping fish is a vital to assess a part of unaccounted fishing mortality. The escape mortality of some commercial fish, particularly haddock (Melanogrammus aeglefinus) (see Main and Sangster 1990), whiting (Merlangius merlangus) (see Sangster et al 1996) and Atlantic cod (Gadus morhua) (see Suuronen et al 2005, Ingólfsson et al 2007), had been studied over the past 15 years. The interaction between the observed mortality of those species and some factors (e.g., fish size, species, mesh size and shape, and water temperature) had been investigated (Main andSangster 1990, Ingólfsson et al 2007).…”

Section: Discussionmentioning

confidence: 99%

A Preliminary Study on the Survival of Brown Comber, Serranus Hepatus (Actinopterygii, Perciformes, Serranidae), Escaping from the Codend of a Bottom Trawl

Düzbastılar¹,

Özgül²,

Aydin³

et al. 2010

Acta Icth et Piscat

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“…Escape mortality varies among species, fish size, and environmental conditions, and can be immediate or delayed due to skin or internal organ damage, or to higher predation vulnerability (e.g. Suuronen et al 1996aSuuronen et al , 2005. ABSTRACT: We explored the potential ecosystem effects of improved selectivity in the South Catalan Sea demersal trawl fishery.…”

Section: Introductionmentioning

confidence: 99%

Improved trawl selectivity: effects on the ecosystem in the South Catalan Sea (NW Mediterranean)

Coll

Bahamón²,

Sardà³

et al. 2008

Mar. Ecol. Prog. Ser.

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Escape mortality of trawl caught Baltic cod (Gadus morhua) — the effect of water temperature, fish size and codend catch

Cited by 56 publications

References 8 publications

Seasonal variation in mortality of red mullet (<em>Mullus barbatus</em>) escaping from codends of three different sizes in the Aegean Sea

Seasonal variation in mortality of red mullet (<em>Mullus barbatus</em>) escaping from codends of three different sizes in the Aegean Sea

A Preliminary Study on the Survival of Brown Comber, <I>Serranus Hepatus</I> (Actinopterygii, Perciformes, Serranidae), Escaping from the Codend of a Bottom Trawl

Improved trawl selectivity: effects on the ecosystem in the South Catalan Sea (NW Mediterranean)

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