Simulating the indirect handline jigging effects on the European squid Loligo vulgaris in captivity

Cabanellas‐Reboredo, Miguel; Alós, Josep; Palmer, Miquel; Grädel, Roman; Morales‐Nin, Beatriz

doi:10.1016/j.fishres.2011.05.013

Cited by 11 publications

(2 citation statements)

References 43 publications

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“…Unlike fish and many crustaceans, squid have a flexible soft body without a hard surface structure. The cylindrical mantle cavity varies during locomotion and respiration, and the stretched arms and tentacles are also broken easily, often by hooks during the jigging capture process (Cabanellas-Reboredo et al 2011, Kurosaka et al 2012). Thus, measurements based on the soft parts of squid are challenging and frequently contain errors, and an alternative structure should be used to separate stocks on the basis of body morphology.…”

Section: Introductionmentioning

confidence: 99%

Stock identification of neon flying squid (<em>Ommastrephes bartramii</em>) in the North Pacific Ocean on the basis of beak and statolith morphology

Fang¹,

Liu²,

Li³

et al. 2014

Sci. Mar.

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Summary:Cephalopods are becoming increasingly important in global fisheries as a result of increased landings and are playing an important ecological role in the trophic dynamics of marine ecosystems. Ommastrephes bartramii is a pelagic cephalopod species with two widely distributed spawning stocks in the North Pacific Ocean. It is also a major fishing target for the Chinese squid jigging fleets. Successful separation of these two spawning stocks is critical to fisheries management, but tends to be challenging because of their similar morphology. In this study we attempted to identify the stocks based on discriminant analyses of 9 morphological variables of statolith and 12 variables of beaks measured for O. bartramii samples in the North Pacific. A significant difference was revealed in the standardized beak and statolith variables between sexes in the northeast (NE) stock (P<0.05). The northwest (NW) stock showed significant differences between sexes for all variables (P<0.05) except for upper wing length (P>0.05), whereas the NW stock showed no significant difference in either sex for the statolith variables (P>0.05). The same sex also revealed different patterns with different hard structures between the two stocks. In t-tests females showed significant differences between stocks in statolith morphology (P<0.05) and beak morphology (P<0.05); males also showed this difference between cohorts in statolith variables (P<0.05) except dorsal dome length and wing length (P>0.05), but showed no difference between cohorts (P>0.05) in beak morphometric variables. With the combination of two standardized hard parts, correct classification of stepwise discriminant analysis (SDA) was raised by nearly 20% compared with using only one structure, although overlaps of the NW stock were still found in the scatter-plots. It is concluded that adding more appropriate hard structure variables will effectively increase the success of separating geographic stocks by the SDA method.Keywords: Ommastrephes bartramii; statolith; beaks; morphology; geographic stock; stepwise discriminant analysis.Identificación de las poblaciones de pota saltadora (Ommastrephes bartramii) en el Pacífico Norte a partir de la morfología de estatolitos y mandíbulas Resumen: Los cefalópodos son cada vez más importantes en las pesquerías mundiales como consecuencia de su volumen de capturas, jugando un importante rol en la red trófica de los ecosistemas marinos. Ommastrephes bartramii es una especie de cefalópodo pelágico con dos poblaciones de desove de amplia distribución en el Pacífico Norte. Asímismo, es un importante objetivo de las flotas pesqueras chinas de potera automática. La adecuada identificación de sus dos poblaciones de desove es fundamental para la gestión de esta pesquería, siendo una difícil tarea debido a su morfología similar. En este estudio se pretende identificar los stocks en función de los análisis discriminantes de nueve variables morfológicas del estatolito y doce variables de las mandíbulas, obtenidas en muestras de O. bartramii d...

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Section: Introductionmentioning

confidence: 99%

Stock identification of neon flying squid (<em>Ommastrephes bartramii</em>) in the North Pacific Ocean on the basis of beak and statolith morphology

Fang¹,

Liu²,

Li³

et al. 2014

Sci. Mar.

View full text Add to dashboard Cite

show abstract

“…In fact, these cephalopods species had the highest socio-economical impact in the study area (Cabanellas-Reboredo et al, 2011). Squid constitute an important all-year-round by-catch of the bottom trawl fishery working on continental shelf grounds deeper than 50 m, whereas they are caught in relatively smaller numbers by the small-scale fishery (Quetglas et al, 2000.…”

Section: Introductionmentioning

confidence: 94%

The use of Depletion Methods to assess Mediterranean cephalopod stocks under the current EU Data Collection Framework

et al. 2015

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Fuelled by the increasing importance of cephalopod fisheries in Europe, scientists and stakeholders have demanded their assessment and management. However, little has been done to improve the data collection under the EU Data Collection Framework (DCF) in order to analyse cephalopod populations. While the DCF allows member states to design flexible national sampling programmes, it establishes the minimum data requirements (MDR) each state is obliged to fulfil. This study was performed to investigate whether such MDR currently set by the DCF allow the application of depletion models (DMs) to assess European cephalopod stocks. Squid and cuttlefish fisheries from the western Mediterranean were used as a case study. This study sheds doubt on the suitability of the MDR to properly assess and manage cephalopod stocks by means of DMs. Owing to the high plasticity of life-history traits in cephalopod populations, biological parameters should be estimated during the actual depletion period of the fished stocks, rather than performing triennial sampling as established by the DCF. In order to accurately track the depletion event, the rapid growth rates of cephalopods implies that their populations should be monitored at shorter time scales (ideally weekly or biweekly) instead of quarterly as specified by the DCF. These measures would not require additional resources of the ongoing DCF but a redistribution of sampling efforts during the depletion period. Such changes in the sampling scheme could be designed and undertaken by the member states or directly integrated as requirements.

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The impact of spatial scale on local Moran’s I clustering of annual fishing effort for Dosidicus gigas offshore Peru

Feng

Chen

2018

J. Ocean. Limnol.

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Simulating the indirect handline jigging effects on the European squid Loligo vulgaris in captivity

Cited by 11 publications

References 43 publications

Stock identification of neon flying squid (<em>Ommastrephes bartramii</em>) in the North Pacific Ocean on the basis of beak and statolith morphology

Stock identification of neon flying squid (<em>Ommastrephes bartramii</em>) in the North Pacific Ocean on the basis of beak and statolith morphology

The use of Depletion Methods to assess Mediterranean cephalopod stocks under the current EU Data Collection Framework

The impact of spatial scale on local Moran’s I clustering of annual fishing effort for Dosidicus gigas offshore Peru

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