Fishery Collapse Revisited

2021 ◽  
Vol 36 (1) ◽  
pp. 1-22
Author(s):  
Qingran Li ◽  
Martin D. Smith
Keyword(s):  
Fishery Collapse

scholarly journals Fishery collapse, recovery, and the cryptic decline of wild salmon on a major California river

2018 ◽  
Vol 75 (11) ◽  
pp. 1836-1848 ◽  
Author(s):  
Malte Willmes ◽  
James A. Hobbs ◽  
Anna M. Sturrock ◽  
Zachary Bess ◽  
Levi S. Lewis ◽  
...  
Keyword(s):  
Oncorhynchus Tshawytscha ◽  
Temporal Trends ◽  
River System ◽  
Wild Salmon ◽  
Hatchery Fish ◽  
Relative Contribution ◽  
Feather River ◽  
The Status ◽  
Fishery Collapse ◽  
Salmon Fishery

Fall-run Chinook salmon (Oncorhynchus tshawytscha) from the Sacramento–San Joaquin River system form the backbone of California’s salmon fishery and are heavily subsidized through hatchery production. Identifying temporal trends in the relative contribution of hatchery- versus wild-spawned salmon is vital for assessing the status and resiliency of wild salmon populations. Here, we reconstructed the proportion of hatchery fish on natural spawning grounds in the Feather River, a major tributary to the Sacramento River, using strontium isotope (87Sr/86Sr) ratios of otoliths collected during carcass surveys from 2002 to 2010. Our results show that prior to the 2007–2008 salmon stock collapse, 55%–67% of in-river spawners were of hatchery origin; however, hatchery contributions increased drastically (89%) in 2010 following the collapse. Data from a recent hatchery marking program corroborate our results, showing that hatchery fish continued to dominate (∼90%) in 2011–2012. Though the rebound in abundance of salmon in the Feather River suggests recovery of the stock postcollapse, our otolith chemistry data document a persistent decline of wild spawners, likely leading to the erosion of locally adapted Feather River salmon populations.

scholarly journals History and dynamics of the overexploitation of the blackspot sea bream (Pagellus bogaraveo) in the Bay of Biscay

2010 ◽  
Vol 68 (2) ◽  
pp. 290-301 ◽  
Author(s):  
Pascal Lorance
Keyword(s):  
Sea Bream ◽  
Bay Of Biscay ◽  
Major Species ◽  
Highly Sensitive ◽  
History Of ◽  
Stock Recruitment ◽  
Pagellus Bogaraveo ◽  
First Maturity ◽  
A Minor ◽  
Fishery Collapse

Abstract Lorance, P. 2011. History and dynamics of the overexploitation of the blackspot sea bream (Pagellus bogaraveo) in the Bay of Biscay. – ICES Journal of Marine Science, 68: 290–301. The blackspot sea bream (Pagellus bogaraveo) used to be a major species in the landings from the Bay of Biscay up to the early 1980s. Nowadays, it is only a minor bycatch. Up to the mid-1970s, more than 15 000 t of blackspot sea bream were landed annually in Spanish and French ports. Thereafter, catches declined sharply from 1975 to 1985 and have stayed at low levels ever since. Here, the full history of the fishery collapse is described, using time-series of landings dating back to the early 1900s. Fishing mortalities of the main demersal stocks (hake, anglerfish, sole) were in the range 0.2–0.5 during the last 30 years. It is likely that the blackspot sea bream stock was exploited at a similar level, which is shown here to be unsustainable. The blackspot sea bream is highly sensitive to overfishing because of its protandrous hermaphroditism, with late first maturity (8 years) as females and rather low productivity. According to a yield-per-recruit model, the biomass of fecund females (BFF) is reduced to <20% of virgin BFF for a fishing mortality around 0.2. A dynamic model assuming a simple stock–recruitment relationship fitted to the reconstructed landings explained the collapse, with estimated fishing mortalities never exceeding 0.5.

scholarly journals Climate-induced habitat suitability intensifies fishing-induced life-history variation of a migratory long-lived fish

2021 ◽  
Author(s):  
Ya Wang ◽  
Xi Jie Zhou ◽  
Jiajie Chen ◽  
Bin Xie ◽  
Lingfeng Huang
Keyword(s):  
Climate Change ◽  
Life History ◽  
Habitat Suitability ◽  
Stock Enhancement ◽  
Large Yellow Croaker ◽  
Fishing Pressure ◽  
Life History Variation ◽  
Life History Parameters ◽  
Climate Change Effects ◽  
Fishery Collapse

Intense fishing pressure and climate change are major threats to coastal fisheries. Larimichthys crocea (large yellow croaker) is a long-lived fish, which performs seasonal migrations from its spawning and nursery grounds along the coast of the East China Sea (ECS) to overwintering grounds offshore. This study used length-based analysis and habitat suitability index (HSI) model to evaluate current life-history parameters and overwintering habitat suitability of L. crocea, respectively. We compared both life-history parameters and overwintering HSI between recent (2019) and historical (between 1971 to 1982) to analyze the fishing pressure and climate change effects on the overall population and overwintering phase of L. crocea. In the context of overfishing, the length-based analysis indicated serious overfishing of L. crocea, characterized by reduced catch yield, size truncation, constrained distribution, and advanced maturation in the ECS, namely recruitment bottleneck. In the context of climate change, the overwintering HSI modeling results indicated that climate change has led to decreased sea surface temperature during L. crocea overwintering phase over the last half-century, which in turn led to area decrease and an offshore-oriented shifting of optimal overwintering habitat. The fishing-caused size truncation may constrain the migratory ability and distribution of L. crocea, subsequently led to the mismatch of the optimal overwintering habitat against climate change background, namely habitat bottleneck. Hence, while heavily fishing was the major cause of L. crocea fishery collapse, climate-induced overwintering habitat suitability may have intensified the fishery collapse of L. crocea population. It is important for management to take both overfishing and climate change issues into consideration when developing stock enhancement activities and policy regulations, particularly for migratory long-lived fish that share a similar life history to L. crocea. Combined with China’s current restocking and stock enhancement initiatives, we propose recommendations for future restocking of L. crocea in China.

scholarly journals Compensatory responses by managers, commercial and recreational harvesters to variation in stock abundance of Lake Erie walleye (Sander vitreus vitreus)

2016 ◽  
Author(s):  
Katrine Turgeon ◽  
Kevin B. Reid ◽  
John M. Fryxell ◽  
Thomas D. Nudds
Keyword(s):  
Lake Erie ◽  
Fishing Effort ◽  
Assessment Process ◽  
Risk Governance ◽  
Sander Vitreus ◽  
Commercial Harvest ◽  
Stock Assessments ◽  
Governance Processes ◽  
Fishery Collapse ◽  
Stock Abundance

AbstractDelayed quota adjustments, and/or lagged fishing effort and catch by harvesters, to changes in stock abundance may induce unstable population dynamics and exacerbate the risk of fishery collapse. We examined a 39-y time series of change to quotas by managers, and to effort and catch by both commercial harvesters and anglers, in response to changes in Lake Erie walleye abundance (Sander vitreus) estimated both contemporaneously and retrospectively. Quotas, commercial effort and catch were entrained by contemporaneous estimates of stock abundance. Recreational effort and harvest were not; they had better tracked abundance, as better estimated today, than did the commercial fishery. During the 1990s, a significant mismatch developed between the quota-driven commercial harvest and stock abundance that persisted until a new assessment process obtained. The quasi-open access recreational fishery, instead, freed anglers to respond better to stock abundance. Further elaboration of adaptive risk governance processes, including multi-model inference for stock assessments, may bode well to further reduce risk to fisheries imposed by lagged adjustments to variation in stock abundance.

scholarly journals The (un)sustainable game: An exploration of rhetorical strategies and risk communication in sustainable seafood campaigns

2021 ◽  
Author(s):  
Brigitte Dreger-Smylie
Keyword(s):  
Technical Information ◽  
Future Research ◽  
Environmental Rhetoric ◽  
Niche Markets ◽  
Grand Banks ◽  
The Public ◽  
Sustainable Seafood ◽  
The Public Sphere ◽  
Social Marketing Campaigns ◽  
Fishery Collapse

In the 1990s, following the Newfoundland Grand Banks cod fishery collapse along Canada’s East Coast, the first seafood sustainability certification organization was formed to address this widespread crisis. Two notable campaigns were formed shortly thereafter, both programs the projects of marine aquariums along the West Coast, and have gained significant attention: Vancouver Aquarium’s Oceanwise provides seafood recommendations to restaurants on the most sustainable choices and Monterey Bay Aquarium’s Seafood Watch, creates and disseminates consumer guides. This MRP examines the communication strategies of Seafood Watch and Ocean Wise used to encourage the consumption of sustainable seafood and promote ocean conservation. More specifically, this MRP analyzes the organizations’ use of environmental rhetoric, particularly in terms of framing and topoi, and how they communicate risk and urgency. How sustainable seafood campaigns establish credibility and rationale in the public sphere to communicate urgent, technical information surrounding fishery mismanagement is examined. This research will help inform future guidelines for social marketing campaigns to improve strategy and encourage consumer change. Recommendations for future research include the creation of evaluative programs to measure campaign effectiveness as well as an analysis of the niche markets established through the rising sustainable seafood market.

scholarly journals Timely Events in Their Interrelation to Paddlefish and Sturgeon Harvest from 1945-2010

2018 ◽  
Vol 46 (2018) ◽  
pp. 62-66
Author(s):  
Ryan N. Hupfeld ◽  
Quinton E. Phelps
Keyword(s):  
Mississippi River ◽  
Commercial Fishing ◽  
Natural Ecosystem ◽  
The Caspian Sea ◽  
Shovelnose Sturgeon ◽  
Inland River ◽  
Commercial Harvest ◽  
Inland Rivers ◽  
Fishery Collapse ◽  
International Events

Abstract Due to the high amounts of harvest of natural fish populations, overexploitation can occur and subsequently lead to depleted fisheries. This is especially true for commercially exploited roe-bearing species that exhibit late age at maturation and intermittent spawning. Overexploitation can create an imbalance in natural ecosystem function and in turn jeopardize the livelihood of commercial fishers. Despite the problems created by overexploitation, trends of commercial harvest on large inland river roe-bearing populations have received minimal attention. As such, we evaluated trends in commercial fishing data from 1945-2010 for two roe-bearing species (paddlefish Polyodon spathula and shovelnose sturgeon Scaphirhynchus platorynchus) from two of the largest inland rivers in North America (Mississippi River and Missouri River) adjacent to Missouri. Commercial sturgeon and paddlefish catch has varied from ∼160 to 35,150 kg over the course of the 55-year duration. Abnormally high catches corresponded to initiation of worldwide caviar markets, onset of extensive regulations on the Missouri and Mississippi rivers, and the Caspian Sea fishery collapse; respectively. Further, our results suggest that the harvest of sturgeon and paddlefish have increased since 1945 and may be influenced by local, regional, and international events. Despite the increase in harvest and the possibility of overharvest, commercial fishing regulations have not been thoroughly evaluated for effectiveness. Further evaluation of current management and regulations of these paddlefish and sturgeon fisheries is suggested, especially considering these fisheries may be influenced by local, regional, and international events. Taking potentially influential events into consideration when evaluating and implementing regulations and authorizing commercial harvest permits are vital in sustaining a long term commercial fishery and protecting the livelihood of commercial fishers.

scholarly journals The (un)sustainable game: An exploration of rhetorical strategies and risk communication in sustainable seafood campaigns

2021 ◽  
Author(s):  
Brigitte Dreger-Smylie
Keyword(s):  
Technical Information ◽  
Future Research ◽  
Environmental Rhetoric ◽  
Niche Markets ◽  
Grand Banks ◽  
The Public ◽  
Sustainable Seafood ◽  
The Public Sphere ◽  
Social Marketing Campaigns ◽  
Fishery Collapse

In the 1990s, following the Newfoundland Grand Banks cod fishery collapse along Canada’s East Coast, the first seafood sustainability certification organization was formed to address this widespread crisis. Two notable campaigns were formed shortly thereafter, both programs the projects of marine aquariums along the West Coast, and have gained significant attention: Vancouver Aquarium’s Oceanwise provides seafood recommendations to restaurants on the most sustainable choices and Monterey Bay Aquarium’s Seafood Watch, creates and disseminates consumer guides. This MRP examines the communication strategies of Seafood Watch and Ocean Wise used to encourage the consumption of sustainable seafood and promote ocean conservation. More specifically, this MRP analyzes the organizations’ use of environmental rhetoric, particularly in terms of framing and topoi, and how they communicate risk and urgency. How sustainable seafood campaigns establish credibility and rationale in the public sphere to communicate urgent, technical information surrounding fishery mismanagement is examined. This research will help inform future guidelines for social marketing campaigns to improve strategy and encourage consumer change. Recommendations for future research include the creation of evaluative programs to measure campaign effectiveness as well as an analysis of the niche markets established through the rising sustainable seafood market.

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