Trends in the activity pattern, fishing yields, catch and landing composition between 2009 and 2013 from onboard observations in the Portuguese purse seine fleet

Feijó, Diana; Marçalo, Ana; Bento, Tiago; Barra, Jorge; Marujo, Débora; Correia, Mário João; Silva, Alexandra

doi:10.1016/j.rsma.2017.12.007

Cited by 14 publications

(25 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The separation among the main three regions probably resulted from genetic and environmental differences that could have affected the body and otolith shapes, and may be indicative of spatial stock structure. Similar findings have recently been reported in the North-east Atlantic for T. picturatus (Moreira et al 2018(Moreira et al , 2019a), suggesting that these small pelagic fish, both being collected by the multi-species purseseine fleets (Feijó et al 2018), could share a similar population-structure scenario.…”

Section: Discussionsupporting

confidence: 86%

Population structure of the chub mackerel (Scomber colias) in the North-east Atlantic inferred from otolith shape and body morphometrics

Muniz

Moura²,

Triay‐Portella

et al. 2021

Mar. Freshwater Res.

View full text Add to dashboard Cite

The Atlantic chub mackerel (Scomber colias) is an important commercial fish species of the Northeast Atlantic. Two-year-old individuals collected between January and April of 2018 at six sampling locations (45 fish per site) of the Northeast Atlantic (Azores, Madeira, Canaries and mainland Portugal-Matosinhos, Sesimbra and Portimão) were used for body morphometrics and otolith-shape analyses. Data were analysed by univariate and multivariate statistics. Re-classification success using shape analyses and body morphometrics showed an overall rate of 51 and 74% respectively. Regional differences regarding the otolith-shape analyses suggested a single stock, not necessarily homogenous, with a discrete separation of two main groups (oceanic islands and mainland Portugal). However, body morphometrics showed a more detailed separation in two main groups (Canaries and the others, but with a slight differentiation between fish from Azores-Madeira and mainland Portugal). Moreover, joint analyses gave an overall re-classification success of 82% and allowed a more comprehensive scenario, showing the existence of three main groups (Canaries, Azores-Madeira and mainland Portugal). Regional differences are probably related with different oceanographic conditions influencing the feeding regime and fish growth. The hereby data suggest that S. colias caught in the Northeast Atlantic are different population units, and we recommend a fishery management at a finer regional scale.

show abstract

Section: Discussionsupporting

confidence: 86%

Population structure of the chub mackerel (Scomber colias) in the North-east Atlantic inferred from otolith shape and body morphometrics

Muniz

Moura²,

Triay‐Portella

et al. 2021

Mar. Freshwater Res.

View full text Add to dashboard Cite

show abstract

“…Sardine is the target species and accounts for more than 90% of total catch weight and value (Silva et al 2015). Horse mackerel (Trachurus trachurus), chub mackerel (Scomber colias) and anchovy (Engraulis encrasicolus) account for a smaller part of the landings (Stratoudakis and Marçalo 2002;Feijó et al 2018). Landings in 2017 were 45,488 tonnes with a value of more than €51 M (DGRM.…”

Section: Portuguese Sardine Fisherymentioning

confidence: 99%

“…However, neither sardine nor chub mackerel are currently listed amongst the species in the HSE for SW waters (EU 2014c). Other drivers for slipping in this fishery may be: vessel capacity the presence of non-commercial species, undersized fish, or a mixture of species, which will devalue the catch at auction (Stratoudakis and Marçalo 2002;Marçalo 2009;Feijó et al 2018). The slipping practice typically occurs at the very end of the fishing operation and involves rolling the fish over the float-line (Fig.…”

Section: Portuguese Sardine Fisherymentioning

confidence: 99%

“…There are examples of fisheries where the catch in such cases is shared between nearby vessels (e.g., in Portugal and Spain;Feijó et al 2018). However, the delay associated with transferring the catch to other vessels has been linked with a substantial reduction in catch quality, and hence price (Digre et al 2016).…”

Section: Challenges For the Landing Obligation In Regulatingmentioning

confidence: 99%

See 1 more Smart Citation

Mitigating Slipping-Related Mortality from Purse Seine Fisheries for Small Pelagic Fish: Case Studies from European Atlantic Waters

Marçalo

Breen

Tenningen

et al. 2018

The European Landing Obligation

Self Cite

View full text Add to dashboard Cite

The release of unwanted catches (UWC) from purse seines, while the catch is still in the water, is known as "slipping". Once thought to be a benign process, compared to discarding UWC overboard from the fishing vessel, it is now recognised that "slipping" can lead to significant mortality in the released fish if done inappropriately. In this chapter, we examine purse seining and slipping operations, and discuss what drives slipping and potential mitigation measures to reduce slipping mortality. We use three examples of purse seine fisheries for small pelagic species in the North-east Atlantic; from Norway, Portugal and Spain. The ideal solution (identifying and avoiding UWC before the net is set) requires the development of tools to enable fishers to better characterise target schools in terms of key selection criteria, e.g., with respect to species, individual size and catch biomass. Such tools are being developed, based primarily on hydro-acoustic technology. However, some UWC in purse seine catches are inevitable, and operational improvements in slipping practices have been shown to significantly reduce stress and mortality in the released UWC. We conclude with a discussion on the challenges currently facing the implementation of the European Union (EU) Landing Obligation with regards to minimising slipping related mortality.

show abstract

“…In Portugal, the purse seine is the most important coastal fishery, accounting for 50% (in weight) and 25% in first‐sale value of landings (DGRM, 2019). The sardine ( Sardina pilchardus ) is the main target species of this fishery, although other species, such as the Atlantic chub mackerel ( Scomber colias ) and the horse mackerel ( Trachurus trachurus ), are also captured (Feijó et al, 2018). Until recently, the sardine was the most landed species by the Portuguese purse seine fishery.…”

Section: Introductionmentioning

confidence: 99%

Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018)

Dias

Marçalo

Feijó

et al. 2022

Aquatic Conservation

Self Cite

View full text Add to dashboard Cite

1. Interactions between cetaceans and the purse seine fishery in coastal waters of mainland Portugal were investigated using onboard observations over a period of 15 years (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018). In 10% of the fishing sets, there were interactions with one of three species of cetaceans: common dolphin (Delphinus delphis), bottlenose dolphin (Tursiops truncatus), and harbour porpoise (Phocoena phocoena). The

show abstract

Trends in the activity pattern, fishing yields, catch and landing composition between 2009 and 2013 from onboard observations in the Portuguese purse seine fleet

Cited by 14 publications

References 11 publications

Population structure of the chub mackerel (Scomber colias) in the North-east Atlantic inferred from otolith shape and body morphometrics

Population structure of the chub mackerel (Scomber colias) in the North-east Atlantic inferred from otolith shape and body morphometrics

Mitigating Slipping-Related Mortality from Purse Seine Fisheries for Small Pelagic Fish: Case Studies from European Atlantic Waters

Interactions between the common dolphin, Delphinus delphis, and the Portuguese purse seine fishery over a period of 15 years (2003–2018)

Contact Info

Product

Resources

About