Movements of three large coastal predatory fishes in the northeast Atlantic: a preliminary telemetry study

Pita, Pablo; Freire, Juan

doi:10.3989/scimar.2011.75n4759

Cited by 21 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4). This impact could be due to the fact that L. bergylta is a sedentary species (Darwall et al 1992, Pita and Freire 2011, Villegas-Ríos et al 2013b) that would be particularly affected by competitions with many participants in a constrained area. Nevertheless, the model fitted to this species (Table 3) did not show a time effect, suggesting that the populations recover quickly, probably due to immigration from nearby areas or from deeper waters (Lindfield et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Assessing the impact of spear fishing by using competitions records and underwater visual censuses

Pita¹,

Freire²

2011

Sci. Mar.

Self Cite

View full text Add to dashboard Cite

Summary:Recreational fishers are increasingly competing for space and resources with commercial fishers worldwide, but have been poorly studied. In particular, the impacts of spearfishing competitions on the temperate fish assemblages have seldom been analysed. In Galicia (NW Spain), there are currently 5000 spear fishers, and 500 of them participate in spearfishing competitions. An historic archive of spearfishing competitions was used to assess their influence on the subsequent competitions in the area and to analyse their effect on the fish abundances estimated by underwater visual censuses. The annual recreational catch of the spear fishers was also estimated and comparisons with the commercial landings were performed. The spear fishers targeted 29 species, although six accounted for 95% of the catch. Most of the species show low vulnerabilities to fishing pressure and only Dicentrarchus labrax, among frequently caught species, can be considered as moderately vulnerable. The overall impact of spearfishing competitions on fish populations was limited, although some competitions temporarily reduced the abundances of Labrus bergylta, the main target species, by up to 83%. Spear fishers caught a large proportion of the total catch of common species, with recreational catches of some species (e.g. L. bergylta) matching or exceeding the commercial catch. The inclusion of this fishery in the management models of the coastal ecosystems is strongly recommended.Keywords: underwater visual censuses; fish assemblages; recreational fisheries; spear fishing; fishing impacts; coastal ecosystems.Evaluación del impacto de la pesca submarina mediante el uso de registros de concursos y censos visuales subacuáticos Resumen: Los pescadores recreativos compiten cada vez más intensamente por el espacio y los recursos con los pescadores comerciales en todo el mundo, pero han sido poco estudiados. En particular, rara vez se han analizado los impactos de los concursos de pesca submarina sobre las comunidades de peces propias de las regiones templadas. En Galicia (noroeste de España), en la actualidad hay 5000 pescadores submarinos, y 500 de ellos participan en concursos. Se utilizó un archivo histórico de competiciones de pesca submarina para evaluar su influencia sobre los concursos celebrados posteriormente en la zona y para analizar su efecto sobre las abundancias de peces, estimadas mediante censos visuales subacuáticos (UVC). Además, se estimaron las capturas recreativas anuales de los pescadores submarinos y se realizaron comparaciones con los desembarques comerciales. Los pescadores submarinos capturaron 29 especies, aunque seis representaron el 95% de sus capturas. La mayor parte de las especies muestran bajas vulnerabilidades a la presión pesquera y sólo Dicentrarchus labrax, de entre las especies capturadas con frecuencia, puede ser considerada como moderadamente vulnerable. El impacto global de los concursos de pesca submarina sobre las poblaciones de peces fue limitado, aunque algunos concursos redujeron temporalmente las...

show abstract

Section: Discussionmentioning

confidence: 99%

Assessing the impact of spear fishing by using competitions records and underwater visual censuses

Pita¹,

Freire²

2011

Sci. Mar.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This suggests that the higher number of adults from uncharacterized sources in the 2006 year class were likely due to increased numbers of stray individuals from estuaries outside the study area, for example, from sites along the neighbouring Spanish coast (Tanner et al 2013). In fact, tagging studies have highlighted complex dispersal and large scale movement patterns for adult sea bass (Pickett et al 2004, Pita & Freire 2011 and plaice (Dunn & Pawson 2002), a flatfish phylogenetically close to flounder. Moreover, population structure of Dicentrarchus labrax and Platichthys flesus based on molecular genetic approaches has been shown to be lacking in the North-Eastern Atlantic (Borsa et al 1997, Naciri et al 1999, Coscia & Mariani 2011.…”

Section: Discussionmentioning

confidence: 97%

Connectivity between estuarine and coastal fish populations: contributions of estuaries are not consistent over time

Patrick¹,

Tanner²,

Vasconcelos³

et al. 2013

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

0 juveniles of flounder Platichthys flesus and sea bass Dicentrarchus labrax, collected from estuarine systems along the Portuguese coast in 2006 and 2009, were used as baseline signatures to identify the estuarine nursery of Age-3 + and 2 + coastal fish matching the juvenile year classes. Otolith elemental signatures were determined via Laser Ablation Inductively Coupled Plasma Mass Spectrometry, and successfully identified the estuarine origin of the majority of coastal fish to characterized baseline estuaries. Relative contributions of individual estuaries to coastal areas, quantified using maximum likelihood estimation, varied over time for the 2 year classes analysed. However, some general patterns were discernible in terms of important estuaries versus those with minor or negligible contributions. Assigned nursery origins varied among species and suggested large scale movements along the coast. For P. flesus the main source for recruits changed between year classes from Ria de Aveiro (69%) to the Douro estuary (59%). The Mondego estuary, located near the latitudinal limit of P. flesus, contributed moderate numbers to coastal populations. The Tejo estuary was the most important estuary for D. labrax in both years sampled (55 and 50%, respectively), whilst the Ria de Aveiro hardly contributed to sea bass coastal populations (< 2%). Ultimately, knowledge of which estuaries replenish coastal adult populations, and both local and distant fisheries, is essential for effective management and conservation of these species and their estuarine juvenile habitats.

show abstract

“…While cleaner fish can control lice under certain conditions, their physiology and morphology are not suited for life in more exposed sea cage environments (Yuen et al 2019). Wrasses are typically found in coastal rocky reefs and kelp beds, where habitat structure provides the opportunity to shelter from sustained currents and wave surges (Pita & Freire 2011, Villegas-Ríos et al 2013, Brooker et al 2018, Leclercq et al 2018. They are relatively poor swimmers compared to salmon; large ballan wrasse far larger than the size typically used as cleaner fish in aquaculture have a sustained swimming speed of only 27 cm s −1 at 25°C (Yuen et al 2019), which is considerably lower the sustained swimming speed of post-smolt salmon (75−93 cm s −1 at 3−18°C, respectively; Hvas et al 2017).…”

Section: Spatial Overlap Between Cleaner Fish and Salmon In Sea Cagesmentioning

confidence: 99%

Sea lice removal by cleaner fish in salmon aquaculture: a review of the evidence base

Overton¹,

Barrett²,

Oppedal³

et al. 2020

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

Stocking cleaner fish to control sea lice infestations in Atlantic salmon farms is widespread and is viewed as a salmon welfare-friendly alternative to current delousing control treatments. The escalating demand for cleaner fish (~60 million stocked worldwide per year), coupled with evidence that they experience poor welfare and high mortality in sea cages, requires that the lice removal effect of cleaner fish be substantiated by robust evidence. Here, we systematically ana lysed (1) studies that tested the delousing efficacy of cleaner fish species in tanks or sea cages and (2) studies of spatial overlap-and therefore likely encounter rate-between cleaner fish and salmon when stocked together in sea cages. Only 11 studies compared lice removal between tanks or cages with and without cleaner fish using a replicated experimental design. Most studies had insufficient replication (1 or 2 replicates) and were conducted in small-scale tanks or cages, which does not reflect the large volume and deep cages in which they are deployed commercially. Reported efficacies varied across species and experimental scale: from a 28% increase to a 100% reduction in lice numbers when cleaner fish were used. Further, our review revealed that the interaction of cleaner fish and salmon in sea cages has rarely been documented. While much of the evidence is promising, there is a mismatch between the current evidence and the extent of use by the industry. We recommend replicated studies in 9 key areas at a full commercial scale across all species that are currently widely used. More targeted, evidence-based use of cleaner fish should increase their efficacy and help to alleviate economic, environmental, and ethical concerns.

show abstract

Movements of three large coastal predatory fishes in the northeast Atlantic: a preliminary telemetry study

Cited by 21 publications

References 31 publications

Assessing the impact of spear fishing by using competitions records and underwater visual censuses

Assessing the impact of spear fishing by using competitions records and underwater visual censuses

Connectivity between estuarine and coastal fish populations: contributions of estuaries are not consistent over time

Sea lice removal by cleaner fish in salmon aquaculture: a review of the evidence base

Contact Info

Product

Resources

About