Search

Search Results

• 11. [Article] Reference Points for Vulnerable Fish Species Based on Bioeconomic Age-Structured Models: An Approach for Totoaba macdonaldi

  Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), ...

  Citation × Citation Citation Abstract Copy Title: Reference Points for Vulnerable Fish Species Based on Bioeconomic Age-Structured Models: An Approach for Totoaba macdonaldi Author: María Da-Rocha, José, Hernández-Flores, Alvaro, De Anda-Montañez, Juan Antonio, Salas-Márquez, Silvia, Rodríguez-García, Oswaldo Uriel, Valenzuela-Quiñonez, Fausto Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Title: Reference Points for Vulnerable Fish Species Based on Bioeconomic Age-Structured Models: An Approach for Totoaba macdonaldi Author: María Da-Rocha, José, Hernández-Flores, Alvaro, De Anda-Montañez, Juan Antonio, Salas-Márquez, Silvia, Rodríguez-García, Oswaldo Uriel, Valenzuela-Quiñonez, Fausto Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Close

• 12. [Article] Spatiotemporal Bio-Economic Performance of Artificial Shelters in a Small Scale Rights-Based Managed Caribbean Spiny Lobster (Panulirus argus) Fishery

  The study presents a bioeconomic analysis of artificial shelter performance in a fishery targeting a spiny lobster meta-population, with spatially allocated, individual exclusive benthic property rights ...

  Citation × Citation Citation Abstract Copy Title: Spatiotemporal Bio-Economic Performance of Artificial Shelters in a Small Scale Rights-Based Managed Caribbean Spiny Lobster (Panulirus argus) Fishery Author: Headley, Maren, Cuevas Jiménez, Alfonso, Seijo, Juan Carlos, Villanueva-Poot, Raul, Hernández, Alvaro The study presents a bioeconomic analysis of artificial shelter performance in a fishery targeting a spiny lobster meta-population, with spatially allocated, individual exclusive benthic property rights for shelter introduction and harvest of species. Insights into fishers’ short-run decisions and fishing strategies are also provided. Spatiotemporal bioeconomic performance of shelters located in ten (10) fishing areas during four seasons was compared using two-way ANOVAs and Pearson correlations. Results show that there was spatiotemporal heterogeneity in bioeconomic variables among fishing areas, with mean CPUEs (kg/shelter) ranging from 0.42 kg to 1.3 kg per trip, mean quasi-profits of variable costs per shelter harvested ranging from $6.00 to $19.57 USD per trip, and mean quasi-profits of variable costs ranging from $338 to $1069 USD per trip. Positive moderate correlations between shelter density and CPUE (kg/shelter) per km2 were found. Bioeconomic performance of the shelters was influenced by: spatiotemporal resource abundance and distribution, fishing area location in relation to the port, shelter density, heterogeneous fishing strategies and the management system. The results provide empirical information on the spatiotemporal performance of shelters and fishing strategies and can contribute to management at the local-scale of a meta-population distributed throughout the Caribbean Sea and Gulf of Mexico.  Title: Spatiotemporal Bio-Economic Performance of Artificial Shelters in a Small Scale Rights-Based Managed Caribbean Spiny Lobster (Panulirus argus) Fishery Author: Headley, Maren, Cuevas Jiménez, Alfonso, Seijo, Juan Carlos, Villanueva-Poot, Raul, Hernández, Alvaro The study presents a bioeconomic analysis of artificial shelter performance in a fishery targeting a spiny lobster meta-population, with spatially allocated, individual exclusive benthic property rights for shelter introduction and harvest of species. Insights into fishers’ short-run decisions and fishing strategies are also provided. Spatiotemporal bioeconomic performance of shelters located in ten (10) fishing areas during four seasons was compared using two-way ANOVAs and Pearson correlations. Results show that there was spatiotemporal heterogeneity in bioeconomic variables among fishing areas, with mean CPUEs (kg/shelter) ranging from 0.42 kg to 1.3 kg per trip, mean quasi-profits of variable costs per shelter harvested ranging from $6.00 to $19.57 USD per trip, and mean quasi-profits of variable costs ranging from $338 to $1069 USD per trip. Positive moderate correlations between shelter density and CPUE (kg/shelter) per km2 were found. Bioeconomic performance of the shelters was influenced by: spatiotemporal resource abundance and distribution, fishing area location in relation to the port, shelter density, heterogeneous fishing strategies and the management system. The results provide empirical information on the spatiotemporal performance of shelters and fishing strategies and can contribute to management at the local-scale of a meta-population distributed throughout the Caribbean Sea and Gulf of Mexico.  Close

• 13. [Article] Reforming Fisheries Subsidies

  Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), ...

  Citation × Citation Citation Abstract Copy Title: Reforming Fisheries Subsidies Author: Sanjurjo, Enrique, Hernandez Trejo, Victor Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Title: Reforming Fisheries Subsidies Author: Sanjurjo, Enrique, Hernandez Trejo, Victor Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Close

• 14. [Article] Trends in Fish Price Volatility: Icelandic Whitefish

  For centuries, the Icelandic people has relied on its abundance of natural resources and fisheries in particular. In today’s volatile and homogenous economy of Iceland, fisheries is one of its main export ...

  Citation × Citation Citation Abstract Copy Title: Trends in Fish Price Volatility: Icelandic Whitefish Author: Asche, Frank, Jonsson, Erlendur, Dahl, Roy Endré For centuries, the Icelandic people has relied on its abundance of natural resources and fisheries in particular. In today’s volatile and homogenous economy of Iceland, fisheries is one of its main export industries, together with power-intensive manufacturing and tourism. Consequently, movements in fish prices have a significant effect on the economy as a whole, making the small nation of Iceland vulnerable to fish price volatility.  In this study, we investigate market price uncertainty of exported whitefish in Iceland. Among whitefish, cod is the most important fish species for the Icelandic fisheres, with haddock and pollack following. We model the price volatility for a set of whitefish speiees and establish empirically that price volatility is stable or in a downward trend. Contributing factors such as the food price trends and trends in world whitefish markets are discussed. In addition, we account for other contributing factors to volatility such as the financial crisis, exchange rates, quota restriction and policy implications. Title: Trends in Fish Price Volatility: Icelandic Whitefish Author: Asche, Frank, Jonsson, Erlendur, Dahl, Roy Endré For centuries, the Icelandic people has relied on its abundance of natural resources and fisheries in particular. In today’s volatile and homogenous economy of Iceland, fisheries is one of its main export industries, together with power-intensive manufacturing and tourism. Consequently, movements in fish prices have a significant effect on the economy as a whole, making the small nation of Iceland vulnerable to fish price volatility.  In this study, we investigate market price uncertainty of exported whitefish in Iceland. Among whitefish, cod is the most important fish species for the Icelandic fisheres, with haddock and pollack following. We model the price volatility for a set of whitefish speiees and establish empirically that price volatility is stable or in a downward trend. Contributing factors such as the food price trends and trends in world whitefish markets are discussed. In addition, we account for other contributing factors to volatility such as the financial crisis, exchange rates, quota restriction and policy implications. Close

• 15. [Article] How to Assess the Spatial Representation of Fishery's Revenues? A Method Comparison

  Maps of fishing locations are important in assessing fishery exposure to management alternatives and facilitates stakeholder outreach (e.g. the New England Fishery Management Council’s Omnibus Habitat ...

  Citation × Citation Citation Abstract Copy Title: How to Assess the Spatial Representation of Fishery's Revenues? A Method Comparison Author: DePiper, Geret, Muench, Angela Maps of fishing locations are important in assessing fishery exposure to management alternatives and facilitates stakeholder outreach (e.g. the New England Fishery Management Council’s Omnibus Habitat Amendment 2, http://www.nefmc.org/library/omnibus-habitat-amendment-2 and the Mid-Atlantic Fishery Management Council’s Amendment 16 to the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan, https://www.greateratlantic.fisheries.noaa.gov/regs/2016/September/16msbamend16ea.pdf). Fishing location data is also a primary input into behavioral location choice models. Issues of fishing location accuracy and precision thus affect both a manager’s ability to govern effectively and a researcher’s ability to model welfare changes. Using data from the limited access scallop fishery in the Northeastern US, this study compares revenue maps created by different approaches for the fishing years 2000-2015. Besides the commonly used aggregation approach of logbook data into statistical areas and ten-minutes-square grids, two probability models will be employed. One of the probability models is based on the work of DePiper (2014) and employs statistical representations of logbook point data, while the second approach follows the approach of Münch/DePiper/Demarest (2017) and incorporates a kernel smoother on Vessel Monitoring System track data. This works aims to highlight the differences in the spatial distribution of revenue between the method applied and to discuss the drawbacks of simply aggregating logbook data into standardized grids, which serves as the most common approach to its spatial representation. This research indicates that statistical models can substantially improve the ability to define fishing locations when compared to traditional point aggregation methods. Title: How to Assess the Spatial Representation of Fishery's Revenues? A Method Comparison Author: DePiper, Geret, Muench, Angela Maps of fishing locations are important in assessing fishery exposure to management alternatives and facilitates stakeholder outreach (e.g. the New England Fishery Management Council’s Omnibus Habitat Amendment 2, http://www.nefmc.org/library/omnibus-habitat-amendment-2 and the Mid-Atlantic Fishery Management Council’s Amendment 16 to the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan, https://www.greateratlantic.fisheries.noaa.gov/regs/2016/September/16msbamend16ea.pdf). Fishing location data is also a primary input into behavioral location choice models. Issues of fishing location accuracy and precision thus affect both a manager’s ability to govern effectively and a researcher’s ability to model welfare changes. Using data from the limited access scallop fishery in the Northeastern US, this study compares revenue maps created by different approaches for the fishing years 2000-2015. Besides the commonly used aggregation approach of logbook data into statistical areas and ten-minutes-square grids, two probability models will be employed. One of the probability models is based on the work of DePiper (2014) and employs statistical representations of logbook point data, while the second approach follows the approach of Münch/DePiper/Demarest (2017) and incorporates a kernel smoother on Vessel Monitoring System track data. This works aims to highlight the differences in the spatial distribution of revenue between the method applied and to discuss the drawbacks of simply aggregating logbook data into standardized grids, which serves as the most common approach to its spatial representation. This research indicates that statistical models can substantially improve the ability to define fishing locations when compared to traditional point aggregation methods. Close

• 16. [Article] Commercial Fishing Business Cost Data Collection in the Northeast United States: Changes and Challenges

  Information on the total costs associated with commercial fishing is essential to quantitative estimation of fisheries performance measures that indicate the fleet’s economic health over time as biological, ...

  Citation × Citation Citation Abstract Copy Title: Commercial Fishing Business Cost Data Collection in the Northeast United States: Changes and Challenges Author: Murphy, Tammy, Bailey, Megan Information on the total costs associated with commercial fishing is essential to quantitative estimation of fisheries performance measures that indicate the fleet’s economic health over time as biological, management and cost conditions change. NOAA’s Northeast Fisheries Science Center (NEFSC) collects fixed and labor costs on a periodic basis through voluntary participation in its cost survey. In the Northeastern US, there are no federal fisheries with mandatory fixed and labor cost reporting; data collection efforts must weigh the need to collect these costs routinely with the cost of the data collection and vessel owner survey fatigue. The NEFSC has implemented several rounds of cost data collection (most recently for 2011, 2012 and 2015) to estimate the total costs of commercial fishing and profitability for various segments of the Northeast fleet. The NEFSC modified its data collection methodology in its most recent survey (for 2015). Modifications include changes in the survey instrument and sampling design to address well-established cost collection and estimation challenges (e.g., cost allocation across trips, missing values for aggregate variables, and multiple vessel owners). The 2015 cost survey sampled commercial fishing businesses (rather than fishing vessels, as in prior rounds). Additional outreach and data collection efforts were undertaken in several Northeast ports to supplement the survey modes previously used (mail and Internet). While the objective of these changes was to address known cost data collection and estimation issues, we recognize and will discuss how these changes may create new challenges or twists on well-established ones. Title: Commercial Fishing Business Cost Data Collection in the Northeast United States: Changes and Challenges Author: Murphy, Tammy, Bailey, Megan Information on the total costs associated with commercial fishing is essential to quantitative estimation of fisheries performance measures that indicate the fleet’s economic health over time as biological, management and cost conditions change. NOAA’s Northeast Fisheries Science Center (NEFSC) collects fixed and labor costs on a periodic basis through voluntary participation in its cost survey. In the Northeastern US, there are no federal fisheries with mandatory fixed and labor cost reporting; data collection efforts must weigh the need to collect these costs routinely with the cost of the data collection and vessel owner survey fatigue. The NEFSC has implemented several rounds of cost data collection (most recently for 2011, 2012 and 2015) to estimate the total costs of commercial fishing and profitability for various segments of the Northeast fleet. The NEFSC modified its data collection methodology in its most recent survey (for 2015). Modifications include changes in the survey instrument and sampling design to address well-established cost collection and estimation challenges (e.g., cost allocation across trips, missing values for aggregate variables, and multiple vessel owners). The 2015 cost survey sampled commercial fishing businesses (rather than fishing vessels, as in prior rounds). Additional outreach and data collection efforts were undertaken in several Northeast ports to supplement the survey modes previously used (mail and Internet). While the objective of these changes was to address known cost data collection and estimation issues, we recognize and will discuss how these changes may create new challenges or twists on well-established ones. Close

• 17. [Article] Impacts of the 2008-2009 US West Coast Salmon Ocean Fishery Closure on Salmon Troll Vessels

  Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), ...

  Citation × Citation Citation Abstract Copy Title: Impacts of the 2008-2009 US West Coast Salmon Ocean Fishery Closure on Salmon Troll Vessels Author: Holland, Dan, Richerson, Kate Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Title: Impacts of the 2008-2009 US West Coast Salmon Ocean Fishery Closure on Salmon Troll Vessels Author: Holland, Dan, Richerson, Kate Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Close

• 18. [Article] Potential Impacts of Proposed Changes to the Gulf of Mexico Red Snapper IFQ Program

  Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), ...

  Citation × Citation Citation Abstract Copy Title: Potential Impacts of Proposed Changes to the Gulf of Mexico Red Snapper IFQ Program Author: Ropicki, Andrew, Larkin, Sherry Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Title: Potential Impacts of Proposed Changes to the Gulf of Mexico Red Snapper IFQ Program Author: Ropicki, Andrew, Larkin, Sherry Suggested Bibliographic Reference: NAAFE Forum 2017 Proceedings, March 22-24, 2017. Compiled by Ann L. Shriver with assistance from Stefani Evers. North American Association of Fisheries Economists (NAAFE), Corvallis, 2017. Close

• 19. [Article] Modelling a Small-Scale Sea Cucumber Fishery in Yucatan

  The status of many sea cucumber fisheries in the world is overexploited. Some of the reasons are: an increase in demand from China, the distance of these fisheries to China, and the high rate of fisheries ...

  Citation × Citation Citation Abstract Copy Title: Modelling a Small-Scale Sea Cucumber Fishery in Yucatan Author: Hernández-Flores, Alvaro The status of many sea cucumber fisheries in the world is overexploited. Some of the reasons are: an increase in demand from China, the distance of these fisheries to China, and the high rate of fisheries development. Most sea cucumber fisheries are small-scale with a simple management system. To overcome overexploitation, it is important to know the fisheries management systems. The research questions of this study are: What are the biological and economic factors that accelerate the development of these fisheries? What factors threaten the sustainability of these stocks? And what possible strategies could be implemented? With biological information of the species, fishermen behavior, and the economics, we developed a spatial dynamic bioeconomic model. The model explained the interactions between fishing effort allocation, quasi-profits and population depletion. Our results showed that the main factors that could lead the fishery to the collapse are: a) the spatial pattern, b) excess fishing capacity, c) high quasi-profits in the short term, d) density dependent catchability, and e) heavy density dependence of reproduction. Given the high prices, production, and low opportunity cost of fishers in tropical countries, they often prefer to maximize their short-term gains, regardless of long-term losses due to collapse. Ensuring sustainability requires community agreements and regulations like: minimum legal size, quotas, catch limit per trip, season closed to fishing and rotation of participants. Title: Modelling a Small-Scale Sea Cucumber Fishery in Yucatan Author: Hernández-Flores, Alvaro The status of many sea cucumber fisheries in the world is overexploited. Some of the reasons are: an increase in demand from China, the distance of these fisheries to China, and the high rate of fisheries development. Most sea cucumber fisheries are small-scale with a simple management system. To overcome overexploitation, it is important to know the fisheries management systems. The research questions of this study are: What are the biological and economic factors that accelerate the development of these fisheries? What factors threaten the sustainability of these stocks? And what possible strategies could be implemented? With biological information of the species, fishermen behavior, and the economics, we developed a spatial dynamic bioeconomic model. The model explained the interactions between fishing effort allocation, quasi-profits and population depletion. Our results showed that the main factors that could lead the fishery to the collapse are: a) the spatial pattern, b) excess fishing capacity, c) high quasi-profits in the short term, d) density dependent catchability, and e) heavy density dependence of reproduction. Given the high prices, production, and low opportunity cost of fishers in tropical countries, they often prefer to maximize their short-term gains, regardless of long-term losses due to collapse. Ensuring sustainability requires community agreements and regulations like: minimum legal size, quotas, catch limit per trip, season closed to fishing and rotation of participants. Close

• 20. [Article] At the Mercy of the Sea or Rational Profit-Speculators: Offshore Fishermen in Taiwan

  We investigated the own- and cross-price elasticity of supply (PES) of 20 fish and shellfish species, caught in mixed fisheries off southwestern Taiwan and serving the local fresh seafood market. Because ...

  Citation × Citation Citation Abstract Copy Title: At the Mercy of the Sea or Rational Profit-Speculators: Offshore Fishermen in Taiwan Author: Shaw, Daigee, Heino, Mikko, Liu, Xiaozi We investigated the own- and cross-price elasticity of supply (PES) of 20 fish and shellfish species, caught in mixed fisheries off southwestern Taiwan and serving the local fresh seafood market. Because the licensed fishermen face little regulation constraining their behavior, we hypothesize that they adjust their catch profiles so as to maximize the expected value of their catch, instead of fishing indiscriminately at the mercy of the elements. However, because catches are auctioned after the landing, fishermen face uncertain price. Using daily data from 2001--2015, we found that price-taking fishermen are capable to respond to price changes of 17 of the 20 species by shifting the catch profile. The species with the highest PES are those corresponding to the highest revenues, and the fishermen are the most price elastic during the season when the catches are highest. Input substitution effect and by-catch effect offset each other, leading to weak and mostly insignificant cross-PES for most of the species. Weather conditions such as wave height, wind speed and wind direction do not appear to affect fishermen's targeting decisions for most of the 20 species, but they do affect fishermen's exit decision, i.e., going fishing or not. Title: At the Mercy of the Sea or Rational Profit-Speculators: Offshore Fishermen in Taiwan Author: Shaw, Daigee, Heino, Mikko, Liu, Xiaozi We investigated the own- and cross-price elasticity of supply (PES) of 20 fish and shellfish species, caught in mixed fisheries off southwestern Taiwan and serving the local fresh seafood market. Because the licensed fishermen face little regulation constraining their behavior, we hypothesize that they adjust their catch profiles so as to maximize the expected value of their catch, instead of fishing indiscriminately at the mercy of the elements. However, because catches are auctioned after the landing, fishermen face uncertain price. Using daily data from 2001--2015, we found that price-taking fishermen are capable to respond to price changes of 17 of the 20 species by shifting the catch profile. The species with the highest PES are those corresponding to the highest revenues, and the fishermen are the most price elastic during the season when the catches are highest. Input substitution effect and by-catch effect offset each other, leading to weak and mostly insignificant cross-PES for most of the species. Weather conditions such as wave height, wind speed and wind direction do not appear to affect fishermen's targeting decisions for most of the 20 species, but they do affect fishermen's exit decision, i.e., going fishing or not. Close