Choosing anterior-gear modifications to reduce the global environmental impacts of penaeid trawls

McHugh, Matthew; Broadhurst, Matt K.; Sterling, David J.

doi:10.1007/s11160-016-9459-5

Cited by 30 publications

(11 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Conodon nobilis is a benthic carnivorous predator with a short intestine and large stomach that has a great expansion capacity (Garcia et al 2010). Trawls mainly target demersal organisms (McHugh et al 2017) and species that forage near the bottom (Pombo et al 2014), such as C. nobilis, which is directly affected by such trawling activity. The feeding intensity, described as the fullness index (FI), may be greatly influenced by the availability and type of prey, length range of the predator, reproductive season, and daily variation (Pereira et al 2016, Perelman et al 2017.…”

Section: Discussionmentioning

confidence: 99%

“…However, considering that C. nobilis is a bycatch species, fishery performance indicators (Anderson et al 2015) are considered quite promising in evaluating multispecies fisheries, such as shrimp trawling. The monitoring over time of basic indicators of target and non-target species, which considers population parameters such as size, weight, and maturity, are also important tools to evaluate the sustainability of a fishery (Wells et al 2008, Jarić et al 2016, Plazas-Gómez et al 2018 as well as for the application of different management strategies such as area and time closures and Bycatch Reduce Devices (BRD) (Arellano-Torres et al 2006, McHugh et al 2017, Pérez Roda et al 2019.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Population structure, size at first sexual maturity, and feeding ecology of Conodon nobilis (Actinopterygii: Perciformes: Haemulidae) from the coasts of Pernambuco, north-eastern Brazil

Lira¹,

Viana²,

Eduardo³

et al. 2019

Acta Ichthyol. Piscat.

View full text Add to dashboard Cite

Background. Although the information on fish ecology and population dynamic are fundamental for fisheries assessment and the development of sustainable management practices, there is still a gap for bycatch species, mainly in tropical coastal areas. The aim of the presently reported study was to describe the feeding habitats, mean length of maturation, and the population structure of Conodon nobilis (Linnaeus, 1758) caught as bycatch of the shrimp trawl fisheries in the south of Pernambuco, northeastern Brazil. Materials and methods. Specimens of C. nobilis were collected monthly from August 2011 through July 2012, using an artisanal shrimp outrigger trawler from the local fleet. The population structure was analysed by sex, length, and seasons. Stomachs and gonads were removed and examined to define the length at first maturity (L 50) and the feeding habits of C. nobilis in northeastern Brazil. Results. A total of 272 specimens were caught. The sex ratio was similar among females and males in the area. The mean size at first maturity (L 50) was estimated as 14.3 ± 0.65 cm. The diet of the species was mainly based on crustaceans (Penaeidae) and fish, however, it was not observed differences in the diet between juvenile and adults, and climate seasons. Conclusion. Conodon nobilis was classified as a zoobenthivore species, and showed a higher proportion of individuals caught above the L 50. The information here provided, combined with other studies in the region, may contribute to the development of improved management strategies to species conservation and exploited marine habitats in northeast Brazil, which is still mostly unknown.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Population structure, size at first sexual maturity, and feeding ecology of Conodon nobilis (Actinopterygii: Perciformes: Haemulidae) from the coasts of Pernambuco, north-eastern Brazil

Lira¹,

Viana²,

Eduardo³

et al. 2019

Acta Ichthyol. Piscat.

View full text Add to dashboard Cite

show abstract

“…Gear drag impacts fuel consumption (McHugh et al 2017), hence the carbon footprint of scientific monitoring. Overall, there is likely room for reducing the carbon footprint by restructuring survey vessel fleets.…”

Section: Reducing Trawling Impactsmentioning

confidence: 99%

We can reduce the impact of scientific trawling on marine ecosystems

Trenkel¹,

Vaz²,

Albouy³

et al. 2019

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

The negative impacts that scientific monitoring may have on marine ecosystems has been a neglected topic, mainly on the basis that its magnitude is minor compared to commercial fisheries, even though this raises ethical and, in certain cases, conservation issues. We argue that ethical principles should lead us to reconsider marine wildlife resource monitoring such as the fish and shellfish trawl surveys providing the science-based evidence needed for fisheries management and assessment of how environmental change impacts marine shelf communities worldwide. Recent scientific and technological progress has provided methods and tools which might now be harnessed to reduce the impact of marine monitoring. We review these alternative methods, consider modifications to current practices and identify areas requiring further research

show abstract

“…For several decades, efforts to reduce bycatch have usually involved researchers developing solutions that are then trialled in fisheries, modified and eventually implemented as regulations (Kennelly, ; McHugh, Broadhurst, & Sterling, ). Such work has resulted in a plethora of bycatch reduction devices (BRDs), and fishing industries that have become well‐versed in their benefits and applications.…”

Section: Introductionmentioning

confidence: 99%

“…Penaeid trawls are one of the world's least selective fishing gears, catching large quantities of non‐targeted fish and other organisms; the mortality of which is considered wasteful (Alverson, Freeberg, Murawski, & Pope, ; Kelleher, ). Despite decades developing various operational and technical modifications to reduce bycatch and/or discard mortality (reviewed by Broadhurst, ; McHugh et al, ) significant issues remain throughout many penaeid‐trawl fisheries. Most developments have involved modifications at or near the codend, comprising grids or strategically positioned panels and meshes under the (mostly untested) assumption of minimal escape mortality (for reviews, see Broadhurst, ; Broadhurst, Suuronen, & Hulme, ; McHugh et al, ).…”

Section: Introductionmentioning

confidence: 99%

Adaptive bycatch reduction in penaeid trawls via rapid adjustments to headline height

Kennelly

Melli

Broadhurst

2019

Fisheries Management Eco

Self Cite

View full text Add to dashboard Cite

Penaeid trawling is among the world's least selective fishing methods; a characteristic that has evoked spatial closures being implemented in some fisheries if certain bycatch limits are exceeded. For decades, considerable work has been done to develop modifications to penaeid trawls that reduce unwanted bycatches, with most focussed at the posterior section (i.e. codend). More recently, efforts have examined ways to prevent bycatch entry into trawls entirely—via modifications to anterior components. This study assessed the utility of proactively lowering the headlines of Australian penaeid trawls, using clips at the otter boards, to 68% and 54% of their conventional height, and demonstrated mean total bycatch reductions (by weight) of 69% and 79%, respectively, with no effects on the targeted Metapenaeus macleayi (Haswell). The results provide insights into the location and behaviour of various species in the water column preceding capture, and support a simple and easy method for regional fishers to use in situ to avoid excessive bycatch and associated fishing closures. More broadly, the data support ongoing efforts in other penaeid‐trawl fisheries to reduce bycatches via similar, rapid adjustments to anterior components, depending on species‐specific behaviours during capture.

show abstract

Choosing anterior-gear modifications to reduce the global environmental impacts of penaeid trawls

Cited by 30 publications

References 91 publications

Population structure, size at first sexual maturity, and feeding ecology of Conodon nobilis (Actinopterygii: Perciformes: Haemulidae) from the coasts of Pernambuco, north-eastern Brazil

Population structure, size at first sexual maturity, and feeding ecology of Conodon nobilis (Actinopterygii: Perciformes: Haemulidae) from the coasts of Pernambuco, north-eastern Brazil

We can reduce the impact of scientific trawling on marine ecosystems

Adaptive bycatch reduction in penaeid trawls via rapid adjustments to headline height

Contact Info

Product

Resources

About