Industrial Fisheries Research Articles

Capitalism and the Sea: The Maritime Factor in the Making of the Modern World, LiamCamplingAlejandroColásLondon & New York: Verso. 2021. pp. xiv + 418. £20/$29.95 (hardcover). ISBN: 9781784785239

Capitalism and the Sea: The Maritime Factor in the Making of the Modern World, LiamCamplingAlejandroColásLondon & New York: Verso. 2021. pp. xiv + 418. £20/$29.95 (hardcover). ISBN: 9781784785239

Pangasius Fish Skin and Swim Bladder as Gelatin Sources for Hard Capsule Material.

In this paper, we report the extraction and characterization of gelatin from the abundant industrial fishery waste of Pangasius skin and swim bladder and its application as the base material for hard capsule shells. The yield of gelatin ranged between 19 and 23%, content of moisture is 7.6–9.2%, ash is 1.1–1.7%, pH is 4.1–5.2, gel strength is 238–278 bloom, and viscosity is 65–74.7% mP. SDS-PAGE showed all gelatins have chains of α1, α2, and β-peptides. The skin, swim bladder, and mixed gelatins were successfully used in the production of hard capsule shells. The dimensions, weight, disintegration time, and water content properties of the hard capsules from these Pangasius wastes were akin to the standards of commercial capsules.

Fishing activities and viewpoints on fishing gear marking of gillnet fishers in small-scale and industrial fishery in the Gulf of Thailand

Gillnets can cause impacts on marine ecosystems when they become abandoned, lost or otherwise discarded fishing gear (ALDFG). Fishing gear marking is a tool to address ALDFG and its impacts. This study aims to compare the characteristics and fishing activities of fishers in small-scale fishery (SSF) and industrial fishery (IDF) as well as their viewpoints on fishing gear marking practice. Data were collected during July-November 2020 from 95 fishers in five coastal provinces of Thailand. Most fishers used crab gillnets; besides, fishing capability and intensity of fishers in IDF were higher than in SSF. Awareness of fishing gear marking practice of fishers in IDF was higher than in SSF, but acceptance was not different. Preferred material was fabric for fishers in SSF and plastic for fishers in IDF. Most fishers anticipated government as producer. Moreover, further studies are needed to develop suitable materials, installation and cost for fishing gear marking.

Fishing Effort and Associated Catch per Unit Effort for Small-Scale Fisheries in the Mozambique Channel Region: 1950–2016

The Mozambique Channel region in East Africa has diverse marine ecosystems and serves as a migratory corridor for economically important species. Local and foreign industrial fisheries operate in the Mozambique Channel, but regional small-scale fisheries are the crucially important fisheries that provide food security, livelihoods, and economic opportunities for rural coastal communities. This study reconstructed and investigated trends in the fishing effort and catch per unit effort (CPUE) of small-scale marine fisheries in four Exclusive Economic Zones (EEZ) that constitute the Mozambique Channel, i.e., Union of Comoros, Madagascar, Mayotte, and Mozambique, from 1950 to 2016. Effective fishing effort for small-scale fisheries in the form of fishing capacity in kWdays (i.e., kilowatt days) was derived using the number, length, motorization (engine power) by fishing vessels, as well as an approximate human-powered equivalent for shore-based fishers without vessels, as well as days of fishing per year. Effective small-scale fishing effort in the Mozambique Channel increased by nearly 60 times from just over 386,000 kWdays in 1950 to over 23 million kWdays in 2016. Correspondingly, the overall small-scale CPUE, based on previously and independently reconstructed catch data declined by 91% in the region as a whole, from just under 175 kg⋅kWday–1 in the early 1950s to just over 15 kg⋅kWday–1 in recent years. All four EEZs showed the strongest declines in the small-scale CPUE in the earlier decades, driven by motorization and growth in vessel numbers impacting effective fishing effort. Increased motorization combined with a substantial growth in overall vessel numbers were the drivers of the increasing fishing effort and decreasing CPUE, and clearly suggest that continuing to increase the fishing capacity of small-scale fisheries in the absence of effective and restrictive management actions may exacerbate overexploitation risk.

Fish aggregating devices in the eastern tropical Pacific marine corridor, according to the Colombian Fisheries Observer Program

AbstractFish aggregating devices (FADs) are floating objects that facilitate the aggregation of fish; those that aggregate pelagic species such as tunas are of particular interest for artisanal and industrial fisheries.Due to the increasing use of these devices worldwide, bodies responsible for the administration and management of fishery resources have proposed control and surveillance activities focused on the use of such devices. To achieve this, it is essential to have access to quality information, which is usually obtained through on‐board observer programmes such as the Colombian Fisheries Observer Program.Based on the historical records of this programme, and for the first time, the spatial–temporal distribution of the FADs in the eastern tropical sector of the Eastern Pacific Ocean is presented, analysing 166 records of tuna fishing operations carried out between 2009 and 2015. Of the 2,328 sets identified in the records, 957 corresponded to sets on FADs, of which 80.56% were effective and caught 12,246 tons of tuna.The number of sets of FADs increased over time, representing approximately 86.9% of the sets recorded in 2015, compared to 4.8% of this type of set recorded in 2009, with the Eastern Tropical Pacific Marine Corridor being the area of greatest concentration of sets.Considering that the Eastern Tropical Pacific Marine Corridor was designed to promote the conservation and sustainable use of biological diversity in the Eastern Tropical Pacific, this study highlights the need to include as a research priority, the potential effect that aggregation devices may have on the biological connectivity processes present in the corridor, as well as on the dynamics of large pelagic fish populations of commercial interest.In terms of management of FADs, it is recommended that a precautionary approach be adopted and that regulations related to the maximum number of FADs per vessel be adjusted according to their Inter‐American Tropical Tuna Commission class, in addition to assigning a maximum number of sets per vessel.

International\ufeff fisheries threaten globally endangered sharks in the Eastern Tropical Pacific Ocean: the case of the Fu Yuan Yu Leng 999 reefer vessel seized within the Gal\xe1pagos Marine Reserve

Shark fishing, driven by the fin trade, is the primary cause of global shark population declines. Here, we present a case study that exemplifies how industrial fisheries are likely depleting shark populations in the Eastern Tropical Pacific Ocean. In August 2017, the vessel Fu Yuan Yu Leng 999, of Chinese flag, was detained while crossing through the Galápagos Marine Reserve without authorization. This vessel contained 7639 sharks, representing one of the largest seizures recorded to date. Based on a sample of 929 individuals (12%), we found 12 shark species: 9 considered as Vulnerable or higher risk by the IUCN and 8 listed in CITES. Four species showed a higher proportion of immature than mature individuals, whereas size-distribution hints that at least some of the fishing ships associated with the operation may have been using purse-seine gear fishing equipment, which, for some species, goes against international conventions. Our data expose the magnitude of the threat that fishing industries and illegal trade represent to sharks in the Eastern Tropical Pacific Ocean.

Beyond slavery scandals: Explaining working conditions among fish workers in Taiwan and Thailand

This paper draws on research on fisheries based in Taiwan and Thailand, to build an exploratory framework that identifies diverse and multilayered causes for unacceptable working conditions in industrial fisheries. We break down labour relations and working conditions into various elements that can be examined separately, including facilitation of individual and collective actions by workers, wages, recruitment, the role of crewing agencies, employment mobilities, mode of travel to a vessel, type of vessel and gear, locations of ports, working hours, physical and mental abuse, and everyday living conditions, including access to health care. Poor or good performance among these elements do not necessarily co-vary, and that policy actions to improve each of elements are distinct. Although the spotlight has been on labour conditions in Thai fisheries, we observe how there is significant room for improvement in Taiwanese fisheries, particularly the distant water fisheries, and that the improvements in Thailand suggests policy actions for the Taiwan fisheries. While improvements in working conditions require government regulation, monitoring and inspection, it is also crucial to facilitate the ability of workers to improve their situations through individual and collective action.

Biodiversity protection in the 21st century needs intact habitat and protection from overexploitation whether inside or outside parks

Biodiversity protection in the 21st century needs intact habitat and protection from overexploitation whether inside or outside parks

Genetic structure of the pink shrimp Penaeus (Farfantepenaeus) notialis (Pérez-Farfante, 1967) (Decapoda: Penaeidae) in the Colombian Caribbean

The pink shrimp Penaeus notialis is one of the most important commercial species of the world. In the Caribbean Sea of Colombia, they represent 70 % of the catches in industrial fisheries, but since the 90’s it has shown a significant decrease in its abundances because of overexploitation of the resource. Because there are no studies on the genetic status of their populations in the Colombian Caribbean, the current management strategies for the pink shrimp can be improved with genetic criteria. Hence, the objective of this study was to examine the genetic diversity (Ho, He and Fis), structure population (Fst, AMOVA, Bayesian analysis, DAPC, Mantel test) and the connectivity (assignment analysis) in five localities distributed in the Caribbean Sea of Colombia (Zapatá, Arbolete, Isla Fuerte, Punta Canoa y Manaure). Additionally, we assessed the spatial distribution of size structure by geostatistical analysis to identify possible nursery areas and a relationship with the genetic structure observed. The genetic analyses using seven microsatellites loci, showed low genetic diversity (Ho < 0,35), high genetic potential (He < 0,93), high inbreeding (Fis> 0,6) and the presence of three populations (ФST2, 98 = 0,065; P < 0.001) showing significant adjustment to the isolation-by-distance model (r = 0,78, z = −27,92; p = 0,031). It is discussed how the life cycle of the species, geomorphological variations on the continental shelf and marine currents influence the spatial distribution of size structure and genetic lineages of the pink shrimp, as well as the implications of this type of studies in the sustainable management of this valuable fishing resource.

Industrial Fisheries and Ocean Accumulation

Industrial Fisheries and Ocean Accumulation

Movement behaviour and fishery interaction of silky sharks (Carcharhinus falciformis) in the tropical tuna purse seine fishery in the Western Indian Ocean

Abstract The silky shark Carcharhinus falciformis regularly associates with floating objects in the open ocean, resulting in relatively high levels of bycatch in industrial tuna purse seine fisheries using drifting fish aggregating devices (FADs). This bycatch has contributed to concerns regarding the sustainability of this fishery and its impact on silky shark populations. To investigate fishery interactions, movements of 28 silky sharks (86–235 cm TL, mean = 118 cm) fitted with pop-up and archival tags in the western Indian Ocean, between 2010 and 2012, were examined. Monthly overlap between probability surfaces of sharks and two fishery metrics (FAD-tuna catches and FAD positions) were calculated. Vertical habitat use overlapped almost entirely with operational gear depth. Horizontal movements were extensive (3–5024 km) and covered large areas of the western Indian Ocean. Monthly overlap with FAD distributions was consistently high (64.03–100%) highlighting the need for compliance with FAD design regulations to avoid entanglement. Monthly overlap with tuna catches was more variable (8.43–51.83%). The observed movement patterns suggest static spatial management measures would be have limited conservation impact, however dynamic approaches could be appropriate. Limiting fishery activities directly will likely have the greatest conservation outcomes for silky sharks in the purse seine fishery.

Reconstructing historical baseline catches along Highway 101: U.S. West Coast marine fisheries, 1950–2017

The United States of America, as most other countries, emphasizes commercial fisheries when reporting statistics to the Food and Agriculture Organization of the United Nations (FAO), and excludes data from other sectors, such as recreational fisheries. Our study is a first attempt to account comprehensively for all sources of total U.S. marine catches from the Exclusive Economic Zone waters along the West Coast of the continental USA from 1950 to 2017 in one dataset, i.e., excluding the states of Alaska and Hawaii. Total reconstructed catches for 1950–2017 were 1.2 times higher than the data reported by the USA to the FAO. Commercial landings dominated catches, with 65% from large-scale, industrial fisheries and 31% from small-scale, commercial fisheries. Recreational fisheries accounted for 4% of the total catch, after accounting for post-release mortality. Total catches were highest in 1950 at around 750,000 t and declined to 570,000 t by 2017. Internationally unreported discards increased from 24,000 t in 1950 to 86,000 t in 1989, but declined after the introduction of bycatch reduction devices to around 10,000 t year−1 by the mid-2010s. Total catches by taxonomic category suggest a decline in the diversity in catches. Levels of reporting for total catches is excellent for recent decades, with around 95% of total catches accounted for by the mid-2010s, but around 40% of catches were missing from data reported to the FAO between the late 1960s and early 1990s. This discrepancy was largely driven by industrial catches of North Pacific hake (Merluccius productus) that were not in the officially reported data. Our results suggest that recreational fisheries and discards can make up a considerable component of total catches over time. We suggest that the USA include their recreational catch estimates in their annual data submission to the FAO, retroactively to 1950.

A sleeping giant: the historically neglected Brazilian fishing sector

Since the beginning of the decade of the oceans (2021–2030), many countries failed to even develop minimal fisheries management. In some countries, where legislation is appropriately applied to the logistics of marine fishing operations, some measures of containment and fisheries management are being implemented. However, other countries have no effective plans for the sustainable development of the sector. In this paper, we have compiled information on the historical discrepancies in fisheries management in the extensive Brazilian waters and used it to illustrate the institutional neglect of this important blue-economy sector. Since the 1930s, when the first management agencies were registered, fisheries management has been handled by at least 10 different federal agencies. This discontinuity has resulted in a country that is ignorant, overall, of the quantity fished, where fishing occurs, and the status of its fish stocks. The only available long-term fishing production data is held by small state departments or marine protected areas and does not come close to reflecting the total catch of the country, with its continental dimensions and its mix of artisanal and industrial fisheries. For this reason, the present work has compiled information on the years of neglect in the governance of the fishing sector. In addition, we suggest the creation of a pivotal management model, based on three main pillars, for sustainable fisheries development.

Threats of illegal, unregulated, and unreported fishing to biodiversity and food security in the Republic of the Congo.

Illegal, unregulated, and unreported (IUU) fishing poses a major threat to effective management of marine resources, affecting biodiversity and communities dependent on these coastal resources. Spatiotemporal patterns of industrial fisheries in developing countries are often poorly understood, and global efforts to describe spatial patterns of fishing vessel activity are currently based on automatic identification system (AIS) data. However, AIS is often not a legal requirement on fishing vessels, likely resulting in underestimates of the scale and distribution of legal and illegal fishing activity, which could have significant ramifications for targeted enforcement efforts and the management of fisheries resources. To help address this knowledge gap, we analyzed 3 years of vessel monitoring system (VMS) data in partnership with the national fisheries department in the Republic of the Congo to describe the behavior of national and distant-water industrial fleets operating in these waters. We found that the spatial footprint of the industrial fisheries fleet encompassed over one-quarter of the Exclusive Economic Zone. On average, 73% of fishing activity took place on the continental shelf (waters shallower than 200 m). Our findings highlight that VMS is not acting as a deterrent or being effectively used as a proactive management tool. As much as 33% (13% on average) of fishing effort occurred in prohibited areas set aside to protect biodiversity, including artisanal fisheries resources, and the distant-water fleet responsible for as much as 84% of this illegal activity. Given the growth in industrial and distant-water fleets across the region, as well as low levels of management and enforcement, these findings highlight that there is an urgent need for the global community to help strengthen regional and national capacity to analyze national scale data sets if efforts to combat IUU fishing are to be effective.

Twilight Zone Observation Network: A Distributed Observation Network for Sustained, Real-Time Interrogation of the Ocean's Twilight Zone

Abstract The ocean's twilight zone (TZ) is a vast, globe-spanning region of the ocean. Home to myriad fishes and invertebrates, mid-water fishes alone may constitute 10 times more biomass than all current ocean wild-caught fisheries combined. Life in the TZ supports ocean food webs and plays a critical role in carbon capture and sequestration. Yet the ecological roles that mesopelagic animals play in the ocean remain enigmatic. This knowledge gap has stymied efforts to determine the effects that extraction of mesopelagic biomass by industrial fisheries, or alterations due to climate shifts, may have on ecosystem services provided by the open ocean. We propose to develop a scalable, distributed observation network to provide sustained interrogation of the TZ in the northwest Atlantic. The network will leverage a “tool-chest” of emerging and enabling technologies including autonomous, unmanned surface and underwater vehicles and swarms of low-cost “smart” floats. Connectivity among in-water assets will allow rapid assimilation of data streams to inform adaptive sampling efforts. The TZ observation network will demonstrate a bold new step towards the goal of continuously observing vast regions of the deep ocean, significantly improving TZ biomass estimates and understanding of the TZ's role in supporting ocean food webs and sequestering carbon.

Rhodotorula Strains Isolated from Seawater That Can Biotransform Raw Glycerol into Docosahexaenoic Acid (DHA) and Carotenoids for Animal Nutrition

Due to the overexploitation of industrial fisheries, as the principal source of fish oil, as well as the increasing replacement of synthetic pigments for animal nutrition, we need to find sustainable sources for these essential nutrient productions. Marine Rhodotorula strains NCYC4007 and NCYC1146 were used to determine the biosynthesis of docosahexaenoic acid (DHA) and carotenoids by biotransforming raw glycerol, a waste product of biodiesel. To evaluate the presence of inhibitory substances in raw glycerol, both strains were also grown in the presence of analytical grade glycerol and glucose as the main carbon source separately. With raw glycerol, NCYC4007 showed a significant correlation between DHA production and intracellular phosphorous concentrations. NCYC1146, a new Rhodotorula strain genetically described in this work, can produce canthaxanthin but only when glycerol is used as a main carbon source. Then, NCYC4007 could synthesize DHA as a phospholipid, and the production of canthaxanthin depends on the kind of carbon source used by NCYC1146. Finally, malate dehydrogenase activity and glucose production can be used as a proxy of the metabolisms in these marine Rhodotorula. This is the first evidence that marine Rhodotorula are capable of synthesizing DHA and canthaxanthin using an alternative and low-cost source of carbon to potentially scale their sustainable production for animal nutrition.

Industrial Fishing Near West African Marine Protected Areas and Its Potential Effects on Mobile Marine Predators

Marine Protected Areas (MPAs) are increasingly implemented to facilitate the conservation of marine biodiversity and key habitats. However, these areas are often less effective to conserve mobile marine species like elasmobranchs (i.e., sharks and rays). Industrial fishing near MPA borders possibly impacts vulnerable species utilizing these protected areas. Hence, we aimed to study spatiotemporal patterns of industrial fisheries near MPAs, in relation to the bycatch of elasmobranchs. Specifically, we analyzed the spatiotemporal fishing effort within the West African region, mapped fishing effort in the direct vicinity of the Parc National du Banc d’Arguin (PNBA, Mauritania) and the Bijagós Archipelago (BA, Guinea Bissau), and compared the seasonal overlap between elasmobranch bycatch and fishing effort near these MPAs. We combined Automatic Identification System (AIS) data and local fisheries observer data, and determined fishing effort for each gear type and compared this with bycatch of elasmobranchs. We found that industrial fishing effort was dominated by trawling, drifting longlines, and fixed gear types. Although no industrial fishing was observed within both MPAs, 72 and 78% of the buffer zones surrounding the MPAs were fished for the Banc d’Arguin and Bijagós, respectively. Within the Banc d’Arguin buffer zone, trawling and drifting longlines dominated, with longlines mainly being deployed in fall. In the Bijagós buffer zone, trawling and fixed gears were most prevalent. Fisheries observer data for Mauritania showed that elasmobranch catches increased during the most recent sampling years (2016–2018). Elasmobranch catches within the waters of Guinea Bissau peaked in 2016 and decreased in the following two years. Seasonal patterns in elasmobranch bycatch within the waters of both countries are likely caused by increased catches of migratory species. Catches of rays peaked in May and June for Mauritania, and in October for Guinea Bissau. Shark catches were highest in February and July in Mauritanian waters, and in May and October in the waters of Guinea Bissau. Our study indicates that industrial fisheries near the border of ecologically important MPAs may have potentially major implications for ecosystem functioning by the removal of (migratory) predatory species.

Assessing illegal fishing and trade of Atlantic billfish and swordfish by DNA-based identification

Due to the morphological similarity between some billfish species, the International Commission for the Conservation of Atlantic Tunas (ICCAT) recommends the use of molecular tools to identify billfish at the species level to properly manage this imperiled group. In this study, species-specific swordfish and billfish identification was carried out by using PCR-RFLP and multiplex PCR of the mitochondrial COI gene. Samples were obtained during landings of the tuna fleet at the Public Fisheries Port of Santos (PFPS) and in the General Warehouse Company of Sao Paulo (CEAGESP), Brazil. A total of 87 samples from PFPS were identified: Kajikia albida, Tetrapturus georgii, T. pfluegeri, Makaira nigricans, and Istiophorus platypterus. At CEAGESP, 432 individuals were collected, and three species were detected: Xiphias gladius, I. platypterus and T. georgii. Some samples presented an unknown band pattern for PCR-RFLP, which were sequenced and identified as X. gladius. These findings demonstrate that billfishes protected by law are being caught by industrial fisheries, but they are not traded at the CEAGESP. We advocate continuous onboard and of landings fishing monitoring using molecular identification tools in accordance with ICCAT recommendations. We provided evidence that DNA-based methods are efficient in overcoming billfish misidentification in the Atlantic Ocean.

Evolving the narrative for protecting a rapidly changing ocean, post‐COVID‐19. Aquatic Conservation: Marine and Freshwater Ecosystems. DOI: 10.1002/aqc.3512

Evolving the narrative for protecting a rapidly changing ocean, post‐COVID‐19. <i>Aquatic Conservation: Marine and Freshwater Ecosystems</i>. DOI: 10.1002/aqc.3512

The shared fish stocks conservation: revisiting the unconnected enforcement

“There is plenty of other fish in the sea," goes the old cliché as many stocks have been overfished by industrial fisheries, that the over-activity made some fish species in danger. The scope of this paper covers the enforcement issue of Southern Bluefin Tuna (SBT) as endangered fish species. Taking Indonesia, New Zealand, and Australia as member States who catch SBT, this paper is a conceptual study using content analysis aiming to review how these three-member States officially treat SBT stocks. Based on the discussion, it found that since the shared characteristic of SBT, in areas beyond national jurisdiction it might create regulatory gaps. While international provisions have been entered into force in respect of endangered fish stocks in high seas areas, however, a lacuna remained in which the law cannot reach the national fishing area. This situation may lead to a discrepancy framework at the national level. Therefore, this paper argues that connectivity is crucial to link enforcement among relevant States with the real interest. In this context, the enforcement must consider the movement path of SBT from a coastal State (the spawning ground), the flag State (the fishing vessel), and the Port State (the place to land SBT).