scholarly journals Economic incentives to target species and fish size: prices and fine-scale product attributes in Norwegian fisheries

2014 ◽  
Vol 72 (3) ◽  
pp. 733-740 ◽  
Author(s):  
Frank Asche ◽  
Yanyou Chen ◽  
Martin D. Smith
Keyword(s):  
Fisheries Management ◽  
Economic Incentives ◽  
Product Form ◽  
Target Species ◽  
Substantial Variation ◽  
King Crab ◽  
Fish Size ◽  
As Species ◽  
Harvest Timing ◽  
Unique Dataset

Abstract Improved fisheries management provides fishers with more opportunities to maximize harvest value by accounting for valuable attributes of the harvest such as species, harvest timing, fish size, product form, and landing location. Harvest values can also vary by vessel and gear type. Moreover, the extent of targeting can influence the ecosystem in which the fishers operate and provide important management challenges. We utilize a unique dataset containing daily vessel-level fish landings in one region of Norway in 2010 to investigate the value of an array of attributes, including species, product form, product condition, timing, fish size, vessel type, gear type, and landing location for cod and other whitefish species, as well as king crab. We also investigate to what extent landed value differs across different communities, firms, and plants. The results indicate substantial variation for all attributes, highlighting opportunities for fishers as well as potential management challenges. For whitefish, the species landed accounts for three-quarters of the variation in prices. For cod in particular, the fish size accounts for nearly all variation in prices. In these fisheries, market conditions justify management focus on the biological composition of the catch.

scholarly journals A Case Study in Connecting Fisheries Management Challenges With Models and Analysis to Support Ecosystem-Based Management in the California Current Ecosystem

2021 ◽  
Vol 8 ◽  
Author(s):  
Desiree Tommasi ◽  
Yvonne deReynier ◽  
Howard Townsend ◽  
Chris J. Harvey ◽  
William H. Satterthwaite ◽  
...  
Keyword(s):  
Fisheries Management ◽  
West Coast ◽  
California Current ◽  
Fishing Communities ◽  
Target Species ◽  
Ecosystem Models ◽  
Protected Species ◽  
Forage Species ◽  
The U.S

One of the significant challenges to using information and ideas generated through ecosystem models and analyses for ecosystem-based fisheries management is the disconnect between modeling and management needs. Here we present a case study from the U.S. West Coast, the stakeholder review of NOAA’s annual ecosystem status report for the California Current Ecosystem established by the Pacific Fisheries Management Council’s Fisheries Ecosystem Plan, showcasing a process to identify management priorities that require information from ecosystem models and analyses. We then assess potential ecosystem models and analyses that could help address the identified policy concerns. We screened stakeholder comments and found 17 comments highlighting the need for ecosystem-level synthesis. Policy needs for ecosystem science included: (1) assessment of how the environment affects productivity of target species to improve forecasts of biomass and reference points required for setting harvest limits, (2) assessment of shifts in the spatial distribution of target stocks and protected species to anticipate changes in availability and the potential for interactions between target and protected species, (3) identification of trophic interactions to better assess tradeoffs in the management of forage species between the diet needs of dependent predators, the resilience of fishing communities, and maintenance of the forage species themselves, and (4) synthesis of how the environment affects efficiency and profitability in fishing communities, either directly via extreme events (e.g., storms) or indirectly via climate-driven changes in target species availability. We conclude by exemplifying an existing management process established on the U.S. West Coast that could be used to enable the structured, iterative, and interactive communication between managers, stakeholders, and modelers that is key to refining existing ecosystem models and analyses for management use.

scholarly journals The effect of rights-based fisheries management on risk taking and fishing safety

2016 ◽  
Vol 113 (10) ◽  
pp. 2615-2620 ◽  
Author(s):  
Lisa Pfeiffer ◽  
Trevor Gratz
Keyword(s):  
Fisheries Management ◽  
Economic Incentives ◽  
Commercial Fishing ◽  
High Wind ◽  
Safety Issues ◽  
Catch Shares ◽  
Stormy Weather ◽  
The Individual ◽  
Us West ◽  
Competitive Nature

Commercial fishing is a dangerous occupation despite decades of regulatory initiatives aimed at making it safer. We posit that rights-based fisheries management (the individual allocation of fishing quota to vessels or fishing entities, also called catch shares) can improve safety by solving many of the problems associated with the competitive race to fish experienced in fisheries around the world. The competitive nature of such fisheries results in risky behavior such as fishing in poor weather, overloading vessels with fishing gear, and neglecting maintenance. Although not necessarily intended to address safety issues, catch shares eliminate many of the economic incentives to fish as rapidly as possible. We develop a dataset and methods to empirically evaluate the effects of the adoption of catch shares management on a particularly risky type of behavior: the propensity to fish in stormy weather. After catch shares was implemented in an economically important US West Coast fishery, a fisherman’s probability of taking a fishing trip in high wind conditions decreased by 82% compared with only 31% in the former race to fish fishery. Overall, catch shares caused the average annual rate of fishing on high wind days to decrease by 79%. These results are evidence that institutional changes can significantly reduce individual, voluntary risk exposure and result in safer fisheries.

scholarly journals POTENTIAL FISHING GROUND MAPPING BASED ON GIS HOTSPOT MODEL AND TIME SERIES ANALYSIS: A CASE STUDY ON LIFT NET FISHERIES IN SERIBU ISLAND

2017 ◽  
Vol 9 (1) ◽  
pp. 337-356
Author(s):  
Andi Alamsyah Rivai ◽  
Vincentius P. Siregar ◽  
Syamsul B. Agus ◽  
Hiroki Yasuma
Keyword(s):  
Time Series ◽  
Fisheries Management ◽  
Fishing Ground ◽  
Effective Management ◽  
Target Species ◽  
Fishing Activity ◽  
Fishing Season ◽  
Spatio Temporal ◽  
West Monsoon

Information on the spatial and temporal of fishing activity can optimize a fisheries management and increase their economical and biological benefit. For effective management and good understanding of fishing activities, information about fishing ground is crucial. In this study, we aimed to analyze the spatio-temporal of lift net fisheries in Kepulauan Seribu by analyzing their fishing season, investigating their hotspot of fishing ground using GIS-based hotspot model, and mapping the potential fishing ground of each target species. We found that anchovy and scad could be caught throughtout the year, while sardine and squid had high fishing season in west monsoon. Hotspot of fishing ground of lift net fisheries in Kepulauan Seribu waters generally was concentrated around Lancang Island and in southern part of Kotok Island. Potential fishing ground for sardines was located in around Lancang Island on west monsoon. Squids were highly distributed around Lancang Island in December to January and around Lancang and Rambut Islands in November. Anchovy and scad had more potential fishing ground in around Kepulauan Seribu waters.  Keywords: fishing ground, lift net, hotspot, fishing season 

scholarly journals Not All Those Who Wander Are Lost – Responses of Fishers’ Communities to Shifts in the Distribution and Abundance of Fish

2021 ◽  
Vol 8 ◽  
Author(s):  
Eva A. Papaioannou ◽  
Rebecca L. Selden ◽  
Julia Olson ◽  
Bonnie J. McCay ◽  
Malin L. Pinsky ◽  
...  
Keyword(s):  
Climate Change ◽  
Qualitative Interviews ◽  
Target Species ◽  
Southern States ◽  
Recent Warming ◽  
As Species ◽  
Common Response ◽  
Management Policies ◽  
Silver Hake ◽  
Catch Composition

As species respond to warming water temperatures, fishers dependent upon such species are being compelled to make choices concerning harvest strategies. Should they “follow fish” to new fishing grounds? Should they change their mix of target species? Should they relocate their operations to new ports? We examined how fishing communities in the Northeast United States —a hotspot of recent warming—have already responded to documented shifts in the distribution and abundance of fluke, red and silver hake. We focused on groundfish trawl communities that historically targeted these species and examined their “at-sea” responses by combining qualitative interviews with quantitative analysis of fishing records and ecological surveys. Three distinct responses emerged: shifting fishing grounds, shifting target species, and shifting port of landing. Our research finds that following the fish is rare and only occurred in one of the assessed communities, the large trawler community of Beaufort, North Carolina. The more common response was a shift in target species and a change in catch composition. However, regulations and markets often constrained the ability to take advantage of a changing mix of species within fishing grounds. Indeed, the overall species diversity in catch has declined among all of our focal communities suggesting that communities have lost the ability to be flexible when it may be most needed as a response to climate change. Additionally, the high value of fluke and the need to land in southern states with higher quota allocations is likely a driver of the changing nature of “community” with increasing vessels landing outside their home port, especially when landing fluke. Our findings suggest that fidelity to historical fishing grounds combined with perceiving environmental change as non-permanent, predispose many fishers to trust in “cyclicality” and return of species over time. However, this strategy may make those communities unable or unwilling to “follow fish” more vulnerable to changes in distribution and abundance due to climate change. Our findings have the potential to directly inform resource management policies as well as more deliberate adaptations by communities themselves as they strive to address the imminent risks of climate change.

Different but the Same

2016 ◽  
Vol 666 (1) ◽  
pp. 203-218 ◽  
Author(s):  
Katharine M. Donato ◽  
Amanda R. Carrico ◽  
Blake Sisk ◽  
Bhumika Piya
Keyword(s):  
Labor Market ◽  
International Migration ◽  
Legal Status ◽  
Environmental Changes ◽  
Economic Outcomes ◽  
Event History ◽  
Substantial Variation ◽  
Bank Account ◽  
Social Contacts ◽  
Unique Dataset

This article builds on prior studies that document how legal status stratifies society, specifically in outcomes related to international migration. Here, we study such outcomes in Bangladesh, a low-lying nation that has experienced dramatic environmental changes in recent decades and high rates of out-migration. We do event history analyses of a new and unique dataset that includes information from approximately eighteen hundred households in nine villages to investigate whether and how legal status differentiates out-migration from Bangladesh. We find substantial variation in legal status among the women and men who make an initial international trip and that unauthorized migration affects other labor market and economic outcomes: it reduces the number of hours that migrants work in destination countries, lowers the odds that migrants pay taxes or open a bank account, and increases the odds that migrants use social contacts to find jobs.

scholarly journals Size, growth and mortality of riverine golden perch (Macquaria ambigua) across a latitudinal gradient

2020 ◽  
Vol 71 (12) ◽  
pp. 1651
Author(s):  
Daniel W. Wright ◽  
Brenton P. Zampatti ◽  
Lee J. Baumgartner ◽  
Steven Brooks ◽  
Gavin L. Butler ◽  
...  
Keyword(s):  
Fisheries Management ◽  
Latitudinal Gradient ◽  
Maximum Size ◽  
Mortality Rates ◽  
Von Bertalanffy ◽  
Fish Size ◽  
Murray Darling Basin ◽  
Size Growth ◽  
Von Bertalanffy Growth Model ◽  
Best Fit

Effective fisheries management requires fish size, growth and mortality information representative of the population and location of interest. Golden perch Macquaria ambigua is long lived, potamodromous and widespread in the Murray–Darling Basin (MDB), Australia. Using a sample spanning 13 river systems and 10° of latitude, we examined whether the maximum size of golden perch differed by latitude and whether growth and mortality varied between northern and southern MDB regions. The length, weight and age ranges of golden perch sampled (n=873) were 52–559mm, 2–3201g and 0+ to 26+ years respectively, and maximum length and weight were unaffected by latitude. Length and age–length distributions represented by age–length keys varied by region, with greater variability in age-at-length and a larger proportion of smaller individuals in northern MDB rivers, which generally exhibit greater variability in discharge. Growth and mortality rates were similar between regions, and an MDB-wide von Bertalanffy growth model (L∞=447, k=0.32 and t0=–0.51) and instantaneous mortality rate (Z=0.20) best described the data. An MDB-wide length–weight equation also provided the best fit (W=6.76×10–6 L3.12). Our data suggest that the MDB can be treated as one management unit in terms of golden perch maximum size, growth and mortality parameters.

scholarly journals Management of Bristol Bay Red King Crab: A Critical Intersections Approach to Fisheries Management

1998 ◽  
Vol 6 (3) ◽  
pp. 169-251 ◽  
Author(s):  
Timothy Loher ◽  
P. Scott Hill ◽  
Gretchen Harrington ◽  
Edward Cassano
Keyword(s):  
Fisheries Management ◽  
Red King Crab ◽  
Bristol Bay ◽  
King Crab

scholarly journals Ecological data from observer programmes underpin ecosystem-based fisheries management

2017 ◽  
Vol 74 (6) ◽  
pp. 1481-1495 ◽  
Author(s):  
Eric Gilman ◽  
Mariska Weijerman ◽  
Petri Suuronen
Keyword(s):  
Fisheries Management ◽  
Mortality Data ◽  
Ecological Communities ◽  
Target Species ◽  
Ecological Data ◽  
Ecosystem Models ◽  
Management Measures ◽  
Ecological Risk Assessments ◽  
Ecosystem Based Fisheries Management ◽  
Data Requirements

Abstract Data required from fisheries monitoring programmes substantially expand as management authorities transition to implement elements of ecosystem-based fisheries management (EBFM). EBFM extends conventional approaches of managing single fishery effects on individual stocks of target species by taking into account the effects, within a defined ecosystem, of local to regional fisheries on biodiversity, from genotypes to ecological communities. This includes accounting for fishery effects on evolutionary processes, associated and dependent species, habitats, trophic food web processes, and functionally linked systems. Despite seemingly insurmountable constraints, through examples, we demonstrate how data routinely collected in most observer programmes and how minor and inexpensive expansions of observer data fields and collection protocols supply ecological data underpinning EBFM. Observer data enable monitoring bycatch, including catch and mortality of endangered, threatened and protected species, and assessing the performance of bycatch management measures. They provide a subset of inputs for ecological risk assessments, including productivity–susceptibility analyses and multispecies and ecosystem models. Observer data are used to monitor fishery effects on habitat and to identify and protect benthic vulnerable marine ecosystems. They enable estimating collateral sources of fishing mortality. Data from observer programmes facilitate monitoring ecosystem pressure and state indicators. The examples demonstrate how even rudimentary fisheries management systems can meet the ecological data requirements of elements of EBFM.

Ecosystem Considerations in Fisheries Management: Theory and Practice

2005 ◽  
Vol 20 (3) ◽  
pp. 381-422 ◽  
Author(s):  
Scott Parsons
Keyword(s):  
Fisheries Management ◽  
Single Species ◽  
Ecosystem Approach ◽  
Theory And Practice ◽  
Target Species ◽  
Management Measures ◽  
Species Analysis ◽  
Recent Developments ◽  
Fishing Fleets ◽  
Management Approaches

AbstractThis article examines recent developments with respect to the development and application of an ecosystem approach in marine fisheries management. A number of international fisheries legal instruments now include explicit references to ecosystem considerations. While there has been general agreement on the need to take ecosystem considerations into account, there is no clarity or consensus on how this can best be done. Various definitions of an ecosystem approach emphasise that the focus must be on managing the human activities, which are part of, and impact on, marine ecosystems. An ecosystem approach is neither inconsistent with, nor a replacement for, existing fisheries management approaches—it is not a panacea for the problems confronting world fisheries. Realistically, we can only move to an ecosystem approach incrementally, starting with more rigorous/cautious application and extension of single species methods. A key element of any ecosystem approach will likely be to set harvest rates for target species at even lower conservative levels than might be suggested by single species analysis. Fisheries management measures should also ensure the protection not only of target species, but also of non-target, associated or dependent species. Reducing the killing power of the world's fishing fleets is an essential component of ecosystem-based fisheries management.

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