Protection of the goose barnacle Pollicipes pollicipes, Gmelin, 1790 population: the Gaztelugatxe Marine Reserve (Basque Country, northern Spain)

Borja, Á.; Muxika, Iñigo; Bald, Juan

doi:10.3989/scimar.2006.70n2235

Cited by 24 publications

(16 citation statements)

References 15 publications

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“…This has been observed throughout its distributional range (Barnes, 1996;Cruz, 2000;Borja et al, 2006b;Cruz et al, 2010) and also in the RNB area (Cruz et al, 2008). Most of the exploited barnacles in the RNB (and at other harvesting sites) come from the low intertidal populations due to their higher quality for human consumption and higher commercial value (Cruz et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

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Management of the stalked barnacle (Pollicipes pollicipes) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Jacinto¹,

Cruz²,

Silva³

et al. 2011

Sci. Mar.

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SUMMARY:The stalked barnacle Pollicipes pollicipes (Gmelin, 1790) is an important shellfish resource in Portugal. Due to the social-economic importance of barnacle harvesting, a management plan aimed at achieving a controlled and sustainable activity (including temporal and spatial closures, rotational harvesting, a limited number of harvesting licenses, bag and size limits for catches and catch reporting) was implemented in 2000 at the Berlengas Nature Reserve (RNB) in central Portugal. We evaluated the bag and size limits imposed by the management plan, performing observations on harvesting activity and asking licensed harvesters and RNB staff about these measures. Both inquiries and observations suggest that licensed harvesters are not following the bag and size limits imposed. Mean amounts captured in RNB varied from 14 to 24 kg per harvester/day, but 25% of the observations corresponded to higher catches per individual than the total amount allowed (20 kg). Only half of the sampled amounts (taken in autumn 2005 and 2006) were in agreement with the size limit regulation and 50% of the total biomass comprised individuals of maximal rostro-carinal length (RC) ≥25 mm. For most harvesters, size limit is the most difficult management rule to fulfil. Both harvesters and RNB staff agree that surveillance is scarce and is a major problem of this fishing activity. In order to achieve a more sustainable use of this resource, we propose the implementation of a more effective surveillance and monitoring plan, the definition of a unique landing site, the maintenance of the bag limit (20 kg) and a reduction of the size limit (50% of total biomass comprising individuals ≥22 mm RC).Keywords: stalked barnacles, Pollicipes, fishery, management, marine reserve, Portugal. RESUMEN: Gestión de la explotación de percebe (PolliciPes PolliciPes) en la Reserva Natural de Berlengas (Portugal): evaluación del tope de capturas y talla mínima. -El percebe Pollicipes pollicipes (Gmelin, 1790) es un recurso importante en Portugal. Debido a la importancia socioeconómica de la recolección de percebes y con objeto de alcanzar una actividad controlada y sostenible, se implementó en 2000 en la Reserva Natural de Berlengas (RNB; centro de Portugal) un plan de gestión para regular esta actividad (incluyendo el cierre temporal y espacial, rotación de la explotación, número limitado de licencias, topes de captura individual y talla mínima). Hemos evaluado los topes de captura y la talla mínima impuestos por el plan de gestión, realizando observaciones sobre la actividad de recolección y realizando encuestas a perceberos y personal de la RNB sobre tales medidas. Los perceberos no están siguiendo los topes de captura y los límites de tamaño establecidos. Las cantidades medias capturadas en la RNB han variado de 14 a 24 kg por mariscador/día, pero el 25% de las observaciones corresponden a las capturas por persona superior al importe total permitido (20 kg). Sólo la mitad de las muestras (tomadas en el otoño de 2005 y 2006) se mostró de acuerdo con ...

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Section: Discussionmentioning

confidence: 99%

“…During the last few dec-. During the last few decades, P. pollicipes has been highly prized as food and heavily exploited along the Portuguese and Spanish coasts, where there is strong market demand for this resource (Cruz, 2000;Molares and Freire, 2003;Bald et al, 2006;Borja et al, 2006b;Jesus, 2006).…”

Section: Introductionmentioning

confidence: 99%

Management of the stalked barnacle (Pollicipes pollicipes) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Jacinto¹,

Cruz²,

Silva³

et al. 2011

Sci. Mar.

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“…spatial zoning and definition of number of harvesting licences) and surveillance purposes. It can also be useful for establishing a rotational moratorium in a number of areas likely to be exploited, and may permit the maintenance of a spawning pool of larvae that nourish and sustain the exploited areas, as suggested by Borja et al (2000) and Bald et al (2006).…”

Section: Discussionmentioning

confidence: 99%

Predicting Pollicipes pollicipes (Crustacea: Cirripedia) abundance on intertidal rocky shores of SW Portugal: a multi-scale approach based on a simple fetch-based wave exposure index

Jacinto¹,

Cruz²

2016

Sci. Mar.

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Summary:Understanding and predicting patterns of distribution and abundance of marine resources is important for conservation and management purposes in small-scale artisanal fisheries and industrial fisheries worldwide. The goose barnacle (Pollicipes pollicipes) is an important shellfish resource and its distribution is closely related to wave exposure at different spatial scales. We modelled the abundance (percent coverage) of P. pollicipes as a function of a simple wave exposure index based on fetch estimates from digitized coastlines at different spatial scales. The model accounted for 47.5% of the explained deviance and indicated that barnacle abundance increases non-linearly with wave exposure at both the smallest (metres) and largest (kilometres) spatial scales considered in this study. Distribution maps were predicted for the study region in SW Portugal. Our study suggests that the relationship between fetch-based exposure indices and P. pollicipes percent cover may be used as a simple tool for providing stakeholders with information on barnacle distribution patterns. This information may improve assessment of harvesting grounds and the dimension of exploitable areas, aiding management plans and supporting decision making on conservation, harvesting pressure and surveillance strategies for this highly appreciated and socioeconomically important marine resource.Keywords: Pollicipes pollicipes; abundance; wave exposure; GIS; SW Portugal.Prediciendo la abundancia del percebe Pollicipes pollicipes (Crustacea: Cirripedia) en el intermareal rocoso del SW Portugal: un enfoque multi-escalar basado en un simple índice de exposición a las olas Resumen: La comprensión y la predicción de los patrones de distribución y abundancia de los recursos marinos es importante para fines de conservación y la gestión, desde pesquerías artesanales a pequeña escala a la pesca industrial. El percebe (Pollicipes pollicipes) es un recurso marisquero importante y su distribución está estrechamente relacionada con la exposición al oleaje a diferentes escalas espaciales. Modelamos la abundancia (porcentaje de cobertura) de P. pollicipes en función de un simple índice de exposición al oleaje basado en estimaciones de fetch a partir de líneas de costa digitalizadas a diferentes escalas espaciales. El modelo explicó el 47.5 % de la varianza total; de acuerdo con el modelo, la abundancia de percebes aumenta de forma no lineal con la exposición al oleaje a escalas espaciales pequeñas (metros) y grandes (kiló-metros). Obtuvimos mapas de distribución del percebe para la región de estudio en el suroeste de Portugal. Nuestro estudio sugiere que la relación entre los índices de exposición basados en fetch y el porcentaje de cobertura de P. pollicipes puede ser utilizada como una herramienta sencilla sobre los patrones de distribución de percebes de cara a la identificación de bancos marisqueros y la dimensión de las zonas explotables. Esto puede ayudar a mejorar los planes de gestión y apoyar la toma de decisiones en materia de conservación, pre...

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“…Freire and Garcia-Allut, 2000;Molares and Freire, 2003;Bald et al, 2006;Borja et al, 2006b;Jacinto et al, 2010). In recent years, growing concerns over depletion of natural stocks and the consequent stock protection measures (e.g.…”

Section: Introductionmentioning

confidence: 99%

The effects of rearing temperature on reproductive conditioning of stalked barnacles (Pollicipes pollicipes)

et al. 2015

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Please cite this article as: Franco, Sofia C., Aldred, Nick, Sykes, António V., Cruz, Teresa, Clare, Anthony S., The effects of rearing temperature on reproductive conditioning of stalked barnacles (Pollicipes pollicipes), Aquaculture (2015), AbstractPollicipes pollicipes (Crustacea; Pedunculata) is a delicacy on the Iberian Peninsula where, in recent years, stock shortages associated with high market value have increased interest in the aquaculture potential of this species. Though broodstock has been maintained in captivity, detailed culture conditions are lacking. The present study investigated the effects of rearing temperature on reproductive conditioning. During a 4-week period, broodstock were subjected to temperature regimes characteristic of stable spring temperatures (spT), increasing spring to summer temperatures (sp-suT) andincreasing spring to summer temperatures with daily fluctuations of 1 ºC (sp-suT2).Broodstock were monitored for fecundity, egg lamella development, and maturation, larval release rate, nauplius size and survival over 24 h. Cultured broodstock were fecund at smaller sizes (15.94 ± 0.23 mm RC) than wild-collected individuals at the beginning of the experiment (17.71 ± 0.65 mm RC). Fecundity increased significantly in all treatments and development of egg lamellae was highest in treatments in which the temperature increased over the experimental period (average 36% of mature egg lamellae in comparison to an initial 0%). Increasing temperature led to greater maturation of lamellae and more frequent spawning peaks. The number of nauplii released per aquarium (average 110 adult individuals) varied according to treatment and time, averaging 4670 ± 506 nauplii day -1 . Due to the low number of larvae released daily, it is suggested that adults might release larvae gradually, as embryos hatch within the mantle cavity. Average release rates increased towards the end of the conditioning period, with releases on peak days ranging from 10000 to 30000 nauplii per aquarium.For spT, peak values were observed in week 3, while sp-suT and sp-suT2 showed peaks of release in weeks 2 and 4, when temperatures averaged 20 and 23 ºC, respectively.Temperature oscillations led to shorter intervals between peaks of release. In terms of A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 3 the larvae released, there were neither differences in numbers between treatments (128147 ± 13548 nauplii per aquarium over 28 days) nor in size of nauplii (202.89 ± 0.69 µm GW) or 24-h survival (91.56 ± 0.35 %). Notwithstanding the need for further optimization, broodstock reproductive conditioning can be accomplished and a continuous supply of larvae obtained using the protocols described herein. Future studies should focus on the impact of food quality and photoperiod on reproductiveconditioning, as well as the optimization of larval release induction protocols.

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Protection of the goose barnacle Pollicipes pollicipes, Gmelin, 1790 population: the Gaztelugatxe Marine Reserve (Basque Country, northern Spain)

Cited by 24 publications

References 15 publications

Management of the stalked barnacle (<i>Pollicipes pollicipes</i>) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Management of the stalked barnacle (<i>Pollicipes pollicipes</i>) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Predicting <em>Pollicipes pollicipes</em> (Crustacea: Cirripedia) abundance on intertidal rocky shores of SW Portugal: a multi-scale approach based on a simple fetch-based wave exposure index

The effects of rearing temperature on reproductive conditioning of stalked barnacles (Pollicipes pollicipes)

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