The use of the traditional ecological knowledge of fishermen, cost-effective tools and participatory models in artisanal fisheries: Towards the co-management of common octopus in Galicia (NW Spain)

Pita, Pablo; Fernández-Vidal, Duarte; García-Galdo, Javier; Muíño, Ramón

doi:10.1016/j.fishres.2015.07.021

Cited by 54 publications

(36 citation statements)

References 42 publications

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“…However, they can be of considerable local economic importance, especially in southern Europe's artisanal fisheries. Galician waters (NW Spain) support an economically important cephalopod fishery for Octopus vulgaris (Otero et al, 2006; Pita et al, 2016) and loliginid squid, mainly Loligo vulgaris but also Alloteuthis media and Alloteuthis subulata (Jereb et al, 2015), species that are not easily distinguished due to the similarity of their external characters (Jereb et al, 2010). Reflecting the short life cycle and rapid individual growth rates, cephalopod populations are sensitive to effects of environmental variation on reproduction and recruitment (Boyle, 1990; Boyle and Rodhouse, 2005; Pierce et al, 2008; Hastie et al, 2009; Rodhouse et al, 2014), resulting in wide year to year fluctuations in captures.…”

Section: Introductionmentioning

confidence: 99%

Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach

et al. 2017

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The high mortality of cephalopod early stages is the main bottleneck to grow them from paralarvae to adults in culture conditions, probably because the inadequacy of the diet that results in malnutrition. Since visual analysis of digestive tract contents of paralarvae provides little evidence of diet composition, the use of molecular tools, particularly next generation sequencing (NGS) platforms, offers an alternative to understand prey preferences and nutrient requirements of wild paralarvae. In this work, we aimed to determine the diet of paralarvae of the loliginid squid Alloteuthis media and to enhance the knowledge of the diet of recently hatched Octopus vulgaris paralarvae collected in different areas and seasons in an upwelling area (NW Spain). DNA from the dissected digestive glands of 32 A. media and 64 O. vulgaris paralarvae was amplified with universal primers for the mitochondrial gene COI, and specific primers targeting the mitochondrial gene 16S gene of arthropods and the mitochondrial gene 16S of Chordata. Following high-throughput DNA sequencing with the MiSeq run (Illumina), up to 4,124,464 reads were obtained and 234,090 reads of prey were successfully identified in 96.87 and 81.25% of octopus and squid paralarvae, respectively. Overall, we identified 122 Molecular Taxonomic Units (MOTUs) belonging to several taxa of decapods, copepods, euphausiids, amphipods, echinoderms, molluscs, and hydroids. Redundancy analysis (RDA) showed seasonal and spatial variability in the diet of O. vulgaris and spatial variability in A. media diet. General Additive Models (GAM) of the most frequently detected prey families of O. vulgaris revealed seasonal variability of the presence of copepods (family Paracalanidae) and ophiuroids (family Euryalidae), spatial variability in presence of crabs (family Pilumnidae) and preference in small individual octopus paralarvae for cladocerans (family Sididae) and ophiuroids. No statistically significant variation in the occurrences of the most frequently identified families was revealed in A. media. Overall, these results provide new clues about dietary preferences of wild cephalopod paralarvae, thus opening up new scenarios for research on trophic ecology and digestive physiology under controlled conditions.

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Section: Introductionmentioning

confidence: 99%

Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach

et al. 2017

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“…The Ría de Vigo (Galicia, NW Spain) is a highly diverse ecosystem where frequent nutrient enrichment inputs (Á lvarez- Salgado et al, 2003) enhance productivity and important artisanal coastal fisheries, including fisheries for cephalopods (González et al, 1994;Guerra et al, 1994;Aristegui et al, 2004;Tasende et al, 2005;Otero et al, 2008;Pita et al, 2016). The Marine Protected Area located at the seaward end of the Ría de Vigo (Illas Atlánticas de Galicia National Park, PNIAG) has been recently identified as a preferred habitat for cephalopod spawning and juvenile recruitment (Guerra et al, 2014(Guerra et al, , 2015.…”

Section: Introductionmentioning

confidence: 99%

Sepiolid paralarval diversity in a regional upwelling area of the NE Atlantic

et al. 2017

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Sepiolid paralarvae are poorly studied, at least in part, because of the difficulty of accurate identification using morphological analysis. To unravel the biodiversity of sepiolid paralarvae collected in the Ría de Vigo during the upwelling season (2012)(2013)(2014), and to overcome the difficulties of traditional identification, sepiolid paralarvae were identified by amplifying the barcoding gene cytochrome c oxidase subunit I (COI). In addition, morphometric analysis (Generalised Lineal Models, GLM and Discriminant Analysis, DA) was used to identify morphometric patterns useful for paralarval species identification. Genetic barcoding successfully identified 34 Sepiola pfefferi, 31 Rondeletiola minor, 30 Sepiola tridens, 4 Sepiola atlantica, 2 Sepietta neglecta and 1 Sepiola ligulata. COI analysis also allowed us to infer that the paralarvae of the three most abundant species belonged to the same populations independently of the year sampled. GLM suggested that total length (statistically different among the three species) and tentacle length (statistically larger in S. pfefferi from the other two species) were good variables to distinguish among species. DA succeeded in separating S. pfefferi from S. tridens, but R. minor overlapped along the first axes with both species, decreasing the accurate classification rate to 67%.

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“…The spatial information provided by the fishers was digitised and introduced into independent layers in GIS using ArcGIS 10.2.2 software (ESRI, ). The layers obtained from each of the fishers were added into a single layer for each species, but the zones in which two or more fishers agreed on the distribution of their fishing areas were also represented in the final cartography of the fishing grounds by species in the study area (Pita et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…Fishing and non‐fishing activities were differentiated through the analysis of the speed of the boats following the methodology of Pita et al. (). The speed was calculated as the lineal distance separating consecutive GPS records, divided by the elapsed time between them.…”

Section: Methodsmentioning

confidence: 99%

“…and cuttlefish Sepia spp., a very important fishery in other Spanish regions (Cabanellas‐Reboredo, Alós, Palmer & Morales‐Nin, ; Cabanellas‐Reboredo, Palmer, Alós & Morales‐Nin, ; Zarauz et al., ), has not yet been studied in Galicia. This paper examines this recreational fishery as a case study to investigate the use of fishers’ knowledge as a cost‐effective monitoring tool (Pita et al., ) to obtain critical information currently lacking about MRF to be used in integrated management of coastal ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Combining fishers’ knowledge and cost‐effective monitoring tools in the management of marine recreational fisheries: A case study of the squid and cuttlefish fishery of the Ría of Vigo (NW Spain)

Palas

Villasante

Pita

2017

Fisheries Management Eco

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A new methodology based in the use of fishers’ knowledge and cost‐effective tools to obtain information about marine recreational fisheries (MRF) is presented. The squid and cuttlefish fishery of the Ría of Vigo (NW Spain) was selected because it is managed in a data‐poor environment. In‐depth interviews (57) were conducted with fishers, collecting ecological and socio‐economic information. A cartography of fishing grounds based on their knowledge was obtained, while the intensity of effort and catches was mapped by the monitoring of two vessels with low‐cost GPS data loggers. The 102 shore anglers and 248 recreational boats catch 8 t/year of European squid Loligo vulgaris and 11 t/year of common cuttlefish Sepia officinalis (11% of total catches on these species in the area). Shore anglers fish from 11 ports, while boat fishers use 14 fishing grounds (covering 30 km2). Most of the catches (86%) are landed by boats, and their CPUE is higher in the outer part of the Ría of Vigo. The use of fishers’ knowledge and cost‐effective monitoring is encouraged to obtain information for the management of MRF. Given the economic contribution of MRF (260,000 €/year in direct expenses), this activity should be considered in the regulations.

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The use of the traditional ecological knowledge of fishermen, cost-effective tools and participatory models in artisanal fisheries: Towards the co-management of common octopus in Galicia (NW Spain)

Cited by 54 publications

References 42 publications

Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach

Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach

Sepiolid paralarval diversity in a regional upwelling area of the NE Atlantic

Combining fishers’ knowledge and cost‐effective monitoring tools in the management of marine recreational fisheries: A case study of the squid and cuttlefish fishery of the Ría of Vigo (NW Spain)

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