Biodiversity and Habitat Characteristics of the Bycatch Assemblages in Fish Aggregating Devices (FADs) and School Sets in the Eastern Pacific Ocean

Lezama-Ochoa, Nerea; Murua, Hilário; Hall, Martín; Román, Marlon; Ruiz, Jon; Vogel, Nick; Caballero, Ainhoa; Sancristobal, Igor

doi:10.3389/fmars.2017.00265

Cited by 25 publications

(27 citation statements)

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“…In addition to providing information about the most common/rare bycatch species, the log‐abundance curves also provide information on the structure of the bycatch assemblages using Diversity models. Thus, similar Diversity models for each fishing mode explain the structure of these assemblages in the Pacific, Atlantic and Indian Oceans (Lezama‐Ochoa et al, ). Bycatch assemblages in FAD sets are formed by species which are aggregated under FADs for hours or days in the same habitat and are normally distributed (Magurran, ) in large areas (Log‐normal model) (Lezama‐Ochoa, ).…”

Section: Discussionmentioning

confidence: 97%

“…This problem seems to be associated with the low coverage rate of the observer programmes, which is around 10%. In contrast, in the eastern Pacific Ocean, where the coverage rate reaches 100%, a better estimation of the total number of bycatch species was obtained (Lezama‐Ochoa et al, ). In the case of the eastern Pacific Ocean, the complete information allowed the diversity areas to be defined and the environmental characteristics to be modelled with precision.…”

Section: Discussionmentioning

confidence: 99%

“…In the case of the Western Indian Ocean, Lezama‐Ochoa et al () reported 74 species in FAD sets and 56 species in Free School sets. At last, in the eastern Pacific Ocean, Lezama‐Ochoa et al () reported 68 species in FAD sets and 56 in Free School sets. Despite the differences found in the sample size and coverage rate between oceans (the Pacific Ocean has around 100% of coverage rate since 1993), the number of species observed in FAD sets was always higher than in Free School sets in the three oceans.…”

Section: Discussionmentioning

confidence: 99%

“…In the case of the Western Indian Ocean, Lezama‐Ochoa et al () reported 74 species in FAD sets and 56 in Free School sets. At last, in the case of the eastern Pacific Ocean, Lezama‐Ochoa et al () reported 68 species in FAD sets and 56 in School sets.…”

Section: Introductionmentioning

confidence: 99%

“…At last, in the case of the eastern Pacific Ocean, Lezama-Ochoa et al (2017) reported 68 species in FAD sets and 56 in School sets.…”

mentioning

confidence: 99%

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Biodiversity and environmental characteristics of the bycatch assemblages from the tropical tuna purse seine fisheries in the eastern Atlantic Ocean

et al. 2018

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The impact of human activities such as fishing has been identified as a main factor in diversity loss in the open ocean. This paper studies the diversity patterns and environmental characteristics of the bycatch assemblages in Fish Aggregating Devices (FADs) and Free School sets (sets made on schools of tuna) from the tropical tuna purse seine fishery in the eastern Atlantic Ocean (35°W–15°E and 20°N–15°S). Data were collected from scientific observer programmes carried out between 2003 and 2011 on board Spanish and French fleets. The results showed different structure and diversity patterns of the bycatch assemblages depending on the fishing mode, with higher number of species and diversity found in FAD sets than in Free School sets. Bycatch assemblages showed preferences for specific oceanographic characteristics of the Atlantic Ocean, such as the equatorial and seasonal coastal upwelling systems, the Cape Lopez front system and the Guinea dome. The type of set and sea surface temperature play an important role to describe the diversity patterns of these species. These results confirm the importance of integrating different methods to study the marine ecosystem towards the correct implementation of the Ecosystem Approach to Fishery Management (EAFM).

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…At last, in the case of the eastern Pacific Ocean, Lezama-Ochoa et al (2017) reported 68 species in FAD sets and 56 in School sets.…”

mentioning

confidence: 99%

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Biodiversity and environmental characteristics of the bycatch assemblages from the tropical tuna purse seine fisheries in the eastern Atlantic Ocean

et al. 2018

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A 40‐year chronology of the vulnerability of spinetail devil ray (Mobula mobular) to eastern Pacific tuna fisheries and options for future conservation and management

Griffiths

Lezama-Ochoa

2021

Aquatic Conservation

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Tuna fisheries are among the largest and most valuable fisheries in the world, but most interact with many non‐target species, including several of high conservation importance. The spinetail devil ray (Mobula mobular) – listed as ‘Endangered’ on the IUCN Red List of Threatened Species – is a commonly discarded bycatch species, particularly in the eastern Pacific Ocean, yet insufficient data exist to undertake a traditional population assessment. A new ecological risk assessment approach designed for data‐limited settings – Ecological Assessment of the Sustainable Impacts of Fisheries (EASI‐Fish) – was used to reconstruct the historical vulnerability status of M. mobular and to simulate potential changes in its status under 45 hypothetical conservation and management measures. These involved various temporal closures of the eastern Pacific Ocean tuna fishery, decreasing post‐capture mortality by improved handling and release practices, and combinations of the two. The species was classified as ‘Least Vulnerable’ between 1979 and 1993, but became ‘Most Vulnerable’ from 1994, which coincided with a rapid spatial expansion of the industrial purse‐seine fishery, and especially from 2011 following the rapid increase in the number of sets made on floating objects. Simulating the conservation and management measures in place in 2018 revealed that 31 of the 45 scenarios resulted in a change in classification of the species to ‘Least Vulnerable’, which primarily involved a reduction of post‐capture mortality by as little as 20%. It is fortuitous in that education of fishers to implement appropriate best handling and release practices is simpler, more rapid and more cost‐effective than the implementation of fishery closures or gear modifications, which can be expensive and complex to implement and monitor and will probably result in substantial reduction in the catches of target species.

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Nowhere to hide: Sea turtle bycatch in Northwest Africa

de la Hoz Schilling,

Diame,

Hernández Ríos

et al. 2023

Aquatic Conservation

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Fisheries bycatch is considered the largest threat to sea turtle populations globally. However, it has been challenging to assess the impact of bycatch on sea turtles in some regions such as Northwest Africa (i.e. Cabo Verde, Guinea, Guinea–Bissau, Mauritania, Senegal, Sierra Leone and The Gambia) owing to large data gaps. This hampers effective management actions and interferes with conservation efforts in the region. Five sea turtle species occur in Northwest Africa (i.e. green turtle Chelonia mydas, hawksbill Eretmochelys imbricata, leatherback Dermochelys coriacea, loggerhead Caretta caretta and olive ridley Lepidochelys olivacea). The region has regionally and globally important sea turtle nesting and foraging habitats and is a global fishing hotspot, with high and increasing fishing pressure. Available information on sea turtle bycatch in Northwest Africa was compiled from peer‐reviewed and grey literature from 2010 onwards to determine the impact of artisanal and industrial fisheries (by gear type) on regional sea turtle populations and assess the level of threat to individual species. All sea turtle species occurring in the region are impacted by bycatch. Reports suggest that green turtles and loggerheads have the highest bycatch rates, probably owing to their regional abundance and widespread distribution. Some of the potentially highest reported global bycatch rates (14,000–90,000 turtles/year/country) are noted, particularly in gillnets, longlines and handlines. However, further research is needed to understand mortality levels from artisanal fisheries and assess the impact of trawl fisheries operating in the region. Additional sources of mortality include deliberate capture for consumption or trade. To strengthen regional sea turtle conservation and reduce sea turtle bycatch and mortality, urgent action is needed to implement and enforce national protection, establish a bycatch reduction framework (including gear modifications and spatio‐temporal closures), improve fisheries data collection and build capacity.

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Biodiversity and Habitat Characteristics of the Bycatch Assemblages in Fish Aggregating Devices (FADs) and School Sets in the Eastern Pacific Ocean

Cited by 25 publications

References 50 publications

Biodiversity and environmental characteristics of the bycatch assemblages from the tropical tuna purse seine fisheries in the eastern Atlantic Ocean

Biodiversity and environmental characteristics of the bycatch assemblages from the tropical tuna purse seine fisheries in the eastern Atlantic Ocean

A 40‐year chronology of the vulnerability of spinetail devil ray (Mobula mobular) to eastern Pacific tuna fisheries and options for future conservation and management

Nowhere to hide: Sea turtle bycatch in Northwest Africa

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