DOCSLIB.ORG

A Preliminary Study on ABC Estimation Approach for Ecosystem-Based TAC T Management

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
A Preliminary Study on ABC Estimation Approach for Ecosystem-Based TAC T Management Ocean and Coastal Management 157 (2018) 9–22 Contents lists available at ScienceDirect Ocean and Coastal Management journal homepage: www.elsevier.com/locate/ocecoaman A preliminary study on ABC estimation approach for ecosystem-based TAC T management ∗ Hee Joong Kanga, Young Il Seoa, Chang Ik Zhangb, a National Institute of Fisheries Science, 216, Gijanghaean-ro, Gijang-eup, Gijang-gun, Busan, Republic of Korea b Pukyong National University, 45, Yongso-ro, Nam-gu, Busan, Republic of Korea ARTICLE INFO ABSTRACT Keywords: Korea's acceptable biological catch (ABC) for total allowable catch (TAC) management has been estimated by a Ecosystem-based fisheries assessment five-tier system that relies on population-based stock assessment models according to available ecological in- Acceptable biological catch formation for pelagic or demersal species. To overcome the limitations of the current ABC estimation system Total allowable catch based on population dynamic models, this study attempted to integrate the ecosystem-based fisheries assessment Species risk index (EBFA) approach into Korea's current ABC estimation system, and has developed an ABC estimation approach for Sustainability ecosystem-based TAC management. To estimate an ecosystem-based ABC, ABC estimated by the current ABC estimation system was adjusted depending on the species risk index (SRI) that was derived from risk analysis of EBFA. During the process, the SRI-F relationship which generalizes the relationship between SRI and fishing mortality (F) was devised, and was used to estimate an ecosystem-based ABC. Also, the SRI projection as a function of the F scenario was conducted to estimate the regression coefficient of a relationship of SRI and F. We demonstrated an ecosystem-based ABC estimation by applying it to the chub mackerel, one of the TAC species in Korea's large purse seine fishery. As a result, the F at ABC (0.39/year) was adjusted as 0.365/year, while ABC (180,000 mt) was reduced to 170,393 mt. We found that this approach can be used to conservatively estimate the TAC in an ecosystem-based context for quota-managed fisheries. 1. Introduction managed by an ecosystem-based approach considering the impact of fisheries on the ecosystem, to conserve and recover fishery resources Since 1998, the Korean government has implemented a total al- (Zhang, 2006). lowable catch (TAC)-based fisheries management system in order to In response to need for an ecosystem approach to fisheries, a lot of achieve sustainable fisheries. Currently, TAC-based management has fisheries organizations and countries have developed and introduced an been applied to eleven species: chub mackerel (Scomber japonicus), jack ecosystem-based approaches (CSIRO, 2005; FAO, 2007; MSC, 2009). mackerel (Trachurus japonicus), sailfin sandfish (Arctoscopus japonicus), Especially, an ecosystem-based fisheries assessment (EBFA) approach mottled skate (Raja pulchra), snow crab (Chionoecetes opilio), red snow was developed in Korea (Zhang et al., 2009). This method assesses crab (Chionoecetes japonicus), blue crab (Portunus trituberculatus), purple ecosystems by risk analysis of indicators to achieve four management Washington clam (Saxidomus purpuratus), pen shell (Atrina pectinata), objectives: sustainability, biodiversity, habitat quality, and socio-eco- spiny top shell (Batillus cornutus), and common squid (Todarodes paci- nomic benefit(Zhang et al., 2009, 2010). Furthermore, many EBFA ficus). The TAC for these has been allocated based on acceptable bio- application studies have been conducted on Korean fisheries (Seo, logical catch (ABC). The ABC for Korean TAC management has been 2011; Yoon, 2014; Lee, 2014), In particular, a fishery resources as- estimated by a five-tier system that relies on population-based stock sessment, also a forecasting and management system named “an in- assessment models according to available ecological information for tegrated fisheries risk analysis method for ecosystems (IFRAME)”, was pelagic or demersal species (Fig. 1). developed based on EBFA (Zhang et al., 2011), and its usefulness in Korean fishery has been managed by TAC management and other assessing impacts of climate change on fisheries has been verified with measures, but has been degraded in quantity and quality due to eco- comparative analyses of ecosystem models (Hollowed et al., 2013). system changes caused by overfishing and marine pollution (Zhang and The purpose of this study is to integrate EBFA into the current ABC Lee, 2004). Therefore, Korean fishery resources had a need to be estimation system, and develop an new ABC estimation approach for ∗ Corresponding author. E-mail address: [email protected] (C.I. Zhang). https://doi.org/10.1016/j.ocecoaman.2018.02.006 Received 13 September 2017; Received in revised form 22 January 2018; Accepted 10 February 2018 0964-5691/ © 2018 Elsevier Ltd. All rights reserved. H.J. Kang et al. Ocean and Coastal Management 157 (2018) 9–22 Fig. 1. Current acceptable biological catch (ABC) estimation system for total allowable catch (TAC) management in Korea (white rectangle: input data; yellow parallelogram: population parameters; blue rounded rectangle: estimates; light green rectangle: estimates for management; modified from Zhang and Lee (2001)). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.) ecosystem-based TAC management. To estimate an ecosystem-based objective risk index (ORI), and species risk index (SRI) are estimated in ABC, We adjusted ABC calculated by the current ABC estimation system sequence, and the current ABC is adjusted according to SRI level into depending on the species risk index (SRI), which was derived from risk the new ABC estimation. analysis of EBFA. During the process, the SRI-F relationship which The ABC adjustment process for ecosystem-based ABC estimation is generalizes the relationship between SRI and the instantaneous rate of shown in Fig. 3. The first step is estimation of the SRI. When ABC was fishing mortality (F) was devised and was used to estimate an eco- estimated by tier 1–3 methods through the current ABC estimation system-based ABC. Also, SRI projection as a function of the F scenario system, considering information levels, SRI was estimated by E-tier 1, was conducted to estimate the regression coefficient of the SRI-F re- quantitative analysis, with EBFA needing sufficient information about lationship. The new ecosystem-based ABC estimation system was de- the ecosystem. Additionally, in situations where value of fishing mor- monstrated by applying it to the chub mackerel, one of the TAC species tality is known, SRI can be simply obtained through the SRI-F re- in Korea's large purse seine fishery. lationship which will be introduced in the next step. On the other hand, When ABC was estimated by tier 4–5 methods through the current ABC 2. Materials and methods estimation system, SRI was estimated by E-tier 2, semi-quantitative or qualitative analysis, with EBFA needing a relatively low level of in- 2.1. Ecosystem-based ABC estimation system formation about the ecosystem. The second step is projection of the SRI as a function of the in- EBFA is a pragmatic ecosystem-based approach for assessing fishery stantaneous rate of fishing mortality (F) scenario. This study general- resources in Korean waters involving four management objectives: ized the relationship between SRI and F, and developed the SRI-F re- sustainability, biodiversity, habitat quality, and socio-economic benefit lationship. It also predicted values of indicators and then calculated RS, (Zhang et al., 2009, 2010). The new ecosystem-based ABC estimation ORI, and SRI in sequence. Finally, the SRI-F relationship's regression system was developed in the study by incorporating EBFA into the coefficient was estimated by a linear regression analysis of SRI by F. current ABC estimation system in Korea. Fig. 2 shows a simple diagram However, when ABC was estimated by tier 4–5 methods through the for the new ecosystem-based ABC estimation system. This system uti- current ABC estimation system, this step was skipped. lizes input data of the current ABC estimation system as data of in- The third step is projection of an ecosystem-based ABC (ABCEBFA) dicators for sustainability. In addition to this, data of indicators for when SRI varies. Substituting the regression coefficient β of the SRI-F biodiversity, habitat quality, and socio-economic benefit are required. relationship into the ABCEBFA estimation equation, this study projected From the indicators for each management objective, risk score (RS), changes of ABCEBFA as a function of SRI. In the preceding process, an 10 .
Load more

Recommended publications
  • Bibliography Database of Living/Fossil Sharks, Rays and Chimaeras (Chondrichthyes: Elasmobranchii, Holocephali) Papers of the Year 2016
    www.shark-references.com Version 13.01.2017 Bibliography database of living/fossil sharks, rays and chimaeras (Chondrichthyes: Elasmobranchii, Holocephali) Papers of the year 2016 published by Jürgen Pollerspöck, Benediktinerring 34, 94569 Stephansposching, Germany and Nicolas Straube, Munich, Germany ISSN: 2195-6499 copyright by the authors 1 please inform us about missing papers: [email protected] www.shark-references.com Version 13.01.2017 Abstract: This paper contains a collection of 803 citations (no conference abstracts) on topics related to extant and extinct Chondrichthyes (sharks, rays, and chimaeras) as well as a list of Chondrichthyan species and hosted parasites newly described in 2016. The list is the result of regular queries in numerous journals, books and online publications. It provides a complete list of publication citations as well as a database report containing rearranged subsets of the list sorted by the keyword statistics, extant and extinct genera and species descriptions from the years 2000 to 2016, list of descriptions of extinct and extant species from 2016, parasitology, reproduction, distribution, diet, conservation, and taxonomy. The paper is intended to be consulted for information. In addition, we provide information on the geographic and depth distribution of newly described species, i.e. the type specimens from the year 1990- 2016 in a hot spot analysis. Please note that the content of this paper has been compiled to the best of our abilities based on current knowledge and practice, however,
    [Show full text]
  • 2016 Seafood Products Market Brief Korea
    THIS REPORT CONTAINS ASSESSMENTS OF COMMODITY AND TRADE ISSUES MADE BY USDA STAFF AND NOT NECESSARILY STATEMENTS OF OFFICIAL U.S. GOVERNMENT POLICY Voluntary - Public Date: 8/2/2016 GAIN Report Number: KS1624 Korea - Republic of Post: Seoul ATO 2016 Seafood Products Market Brief Report Categories: Fishery Products Approved By: Mark Myers, Acting Ag. Minister-Counselor Prepared By: Sun Young Yoo, Market Promotion Specialist Report Highlights: In 2015, total Korean imports of seafood were $4.24 billion, up 1.9 percent from 2014 due to rising prices. Imports of American seafood increased by 4.9 percent to $233 million, making the United States the fourth largest exporter with a market share of 5.5 percent. U.S. seafood is generally considered high quality and safe, but less price competitive when competing with other origins. By volume, Alaska Pollack Surimi, flatfish, frozen Alaskan Pollack, Cod, Alaskan Pollack roe, Monkfish, ray, Pacific salmon, Hagfish, Atka Mackerel, lobster, etc. are some of the major species imported in large quantities from the United States. By value, Alaskan Pollack Surimi, lobsters, flatfish, live Hagfish, Monkfish, frozen Alaskan Pollack, Cod, Alaskan Pollack roe, skate, and frozen Hagfish were the top ten imported species. Executive Summary: General Information: SECTION I: KOREAN SEAFOOD MARKET OVERVIEW In 2015, Korea’s seafood imports from all origins amounted to $4.24 billion, up 1.9 percent from $4.16 billion in 2014. The United States was the fourth largest exporter of seafood products to Korea. The largest seafood supplying country in 2015 was China at $1.1 billion, followed by Russia at $705 million, Vietnam at $574 million, USA at $233 million, Norway at $218 million, Thailand at $168 million, Japan at $116 million, Taiwan at $102 million, Peru at $99 million and Chile at $97 million.
    [Show full text]
  • Fish in Disguise: Seafood Fraud in Korea
    Fish in disguise: Seafood fraud in Korea A briefing by the Environmental Justice Foundation 1 Executive summary Between January and December 2018, the Environmental Justice Foundation (EJF) used DNA testing to determine levels of seafood fraud in the Republic of Korea. The results showed that over a third of samples tested were mislabelled. This mislabelling defrauds consumers, risks public health, harms the marine environment and can be associated with serious human rights abuses across the world. These findings demonstrate the urgent need for greater transparency and traceability in Korean seafood, including imported products. Key findings: • Over a third of seafood samples (34.8%, 105 of 302 samples) genetically analysed were mislabelled. • Samples labelled Fleshy Prawn, Fenneropenaeus chinensis (100%), Japanese Eel, Anguilla japonica (67.7%), Mottled Skate, Raja pulchra (53.3%) and Common Octopus, Octopus vulgaris (52.9%) had the highest rates of mislabelling. • Not a single sample labelled Fleshly Prawn was the correct species. • Mislabelling was higher in restaurants, fish markets and online than in general markets or superstores. • By processed types, sushi (53.9%), fresh fish (38.9%) and sashimi (33.6%) were the most likely to be mislabelled. • The seafood fraud identified by this research has direct negative impacts for consumers. It is clear that for some species sampled consumers were likely to be paying more than they should. For example, more than half of the eel and skate samples that were labelled domestic were actually found to be imported, which can cost only half of the price of domestic products. Swordfish mislabelled as Bluefin Tuna can be sold for four to five times as much.
    [Show full text]
  • A Review of Longnose Skates Zearaja Chilensisand Dipturus Trachyderma (Rajiformes: Rajidae)
    Univ. Sci. 2015, Vol. 20 (3): 321-359 doi: 10.11144/Javeriana.SC20-3.arol Freely available on line REVIEW ARTICLE A review of longnose skates Zearaja chilensis and Dipturus trachyderma (Rajiformes: Rajidae) Carolina Vargas-Caro1 , Carlos Bustamante1, Julio Lamilla2 , Michael B. Bennett1 Abstract Longnose skates may have a high intrinsic vulnerability among fishes due to their large body size, slow growth rates and relatively low fecundity, and their exploitation as fisheries target-species places their populations under considerable pressure. These skates are found circumglobally in subtropical and temperate coastal waters. Although longnose skates have been recorded for over 150 years in South America, the ability to assess the status of these species is still compromised by critical knowledge gaps. Based on a review of 185 publications, a comparative synthesis of the biology and ecology was conducted on two commercially important elasmobranchs in South American waters, the yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma; in order to examine and compare their taxonomy, distribution, fisheries, feeding habitats, reproduction, growth and longevity. There has been a marked increase in the number of published studies for both species since 2000, and especially after 2005, although some research topics remain poorly understood. Considering the external morphological similarities of longnose skates, especially when juvenile, and the potential niche overlap in both, depth and latitude it is recommended that reproductive seasonality, connectivity and population structure be assessed to ensure their long-term sustainability. Keywords: conservation biology; fishery; roughskin skate; South America; yellownose skate Introduction Edited by Juan Carlos Salcedo-Reyes & Andrés Felipe Navia Global threats to sharks, skates and rays have been 1.
    [Show full text]
  • Spawning Characteristics and Artificial Hatching of Female Mottled Skate, Beringraja Pulchra in the West Coast of Korea
    Dev. Reprod. Vol. 17, No. 3, 247~255, September, 2013 ttp://dx.doi.org/10.12717/DR.2013.17.3.247 ISSN 1226-6752 (Print) ․ ISSN 2287-7967 (Online) Spawning Characteristics and Artificial Hatching of Female Mottled Skate, Beringraja pulchra in the West Coast of Korea † Hee-Woong Kang, Yeong-Rok Jo, Duk-Yong Kang, Gyeong-Suk Jeong and Hyun-Su Jo West Sea Fisheries Research Institute, Incheon 400-420, Republic of Korea ABSTRACT : The gonadsomatic index (GSI) of mottled skate was the highest in April, GSI and HSI showed a reverse phase for its reproductive cycle. The fish had one pair of egg capsules, having 1 to 7 fertilized eggs, and spawned all the year round. When surveying the reproductive characteristics of females over 63 ㎝ in disc width, we found the spawning peak was between April to June, and the appearance ratio of egg capsules was the highest in May (32.1%). The eggs were hatched at 8℃, 13℃, 18℃, water temperature (12.8 to 24.2℃), and the best hatching temperature was 18℃. The number of fish hatched was 4 to 5 fish/egg capsules, and the hatching rate was 100%. The sex ratios of hatching larvae were 45.5% female and 54.5% male. Therefore this study will provide fundamental data and information for artificial reproduction of the mottled skate. Key words : Beringraja pulchra, Closed season, Egg capsule, Hatching, Spawning INTRODUCTION skate is one of the most expensive fish on the market at a hundred thousand Korean won per fish. Currently to The mottled skate (Beringraja pulchra) is a species of avoid over-exploitation, there is regulatory control for a big skate, family Rajidae, in the Rajiformes order.
    [Show full text]
  • Redalyc.A Review of Longnose Skates Zearaja Chilensis and Dipturus Trachyderma (Rajiformes: Rajidae)
    Universitas Scientiarum ISSN: 0122-7483 [email protected] Pontificia Universidad Javeriana Colombia Vargas-Caro, Carolina; Bustamante, Carlos; Lamilla, Julio; Bennett, Michael B. A review of longnose skates Zearaja chilensis and Dipturus trachyderma (Rajiformes: Rajidae) Universitas Scientiarum, vol. 20, núm. 3, 2015, pp. 321-359 Pontificia Universidad Javeriana Bogotá, Colombia Available in: http://www.redalyc.org/articulo.oa?id=49941379004 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Univ. Sci. 2015, Vol. 20 (3): 321-359 doi: 10.11144/Javeriana.SC20-3.arol Freely available on line REVIEW ARTICLE A review of longnose skates Zearaja chilensis and Dipturus trachyderma (Rajiformes: Rajidae) Carolina Vargas-Caro1 , Carlos Bustamante1, Julio Lamilla2 , Michael B. Bennett1 Abstract Longnose skates may have a high intrinsic vulnerability among fishes due to their large body size, slow growth rates and relatively low fecundity, and their exploitation as fisheries target-species places their populations under considerable pressure. These skates are found circumglobally in subtropical and temperate coastal waters. Although longnose skates have been recorded for over 150 years in South America, the ability to assess the status of these species is still compromised by critical knowledge gaps. Based on a review of 185 publications, a comparative synthesis of the biology and ecology was conducted on two commercially important elasmobranchs in South American waters, the yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma; in order to examine and compare their taxonomy, distribution, fisheries, feeding habitats, reproduction, growth and longevity.
    [Show full text]
  • Rapid Development of Microsatellite Markers with 454 Pyrosequencing in a Vulnerable Fish, the Mottled Skate, Raja Pulchra
    Int. J. Mol. Sci. 2012, 13, 7199-7211; doi:10.3390/ijms13067199 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 www.mdpi.com/journal/ijms Article Rapid Development of Microsatellite Markers with 454 Pyrosequencing in a Vulnerable Fish, the Mottled Skate, Raja pulchra Jung-Ha Kang 1, Jung-Youn Park 1 and Hyun-Su Jo 2,* 1 Biotechnology Research Division, NFRDI, Busan 619-705, Korea; E-Mails: [email protected] (J.-H.K.); [email protected] (J.-Y.P.) 2 Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, NFRDI, Incheon 400-420, Korea * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +82-51-720-2462; Fax: +82-51-720-2456. Received: 7 May 2012; in revised form: 5 June 2012 / Accepted: 6 June 2012 / Published: 12 June 2012 Abstract: The mottled skate, Raja pulchra, is an economically valuable fish. However, due to a severe population decline, it is listed as a vulnerable species by the International Union for Conservation of Nature. To analyze its genetic structure and diversity, microsatellite markers were developed using 454 pyrosequencing. A total of 17,033 reads containing dinucleotide microsatellite repeat units (mean, 487 base pairs) were identified from 453,549 reads. Among 32 loci containing more than nine repeat units, 20 primer sets (62%) produced strong PCR products, of which 14 were polymorphic. In an analysis of 60 individuals from two R. pulchra populations, the number of alleles per locus ranged from 1–10, and the mean allelic richness was 4.7. No linkage disequilibrium was found between any pair of loci, indicating that the markers were independent.
    [Show full text]
  • Report on the Assessment of Implementation of Japan's National
    AC19 Doc. 18.3 Annex 1 (English only/Seulement en anglais/Únicamente en inglés) Report on the Assessment of Implementation of Japan’s National Plan of Action for the Conservation and Management of Sharks of FAO (Preliminary version) (Document for submission to the 25th FAO Committee on Fisheries) February 2003 Fisheries Agency, Government of Japan Introduction At the 23rd FAO Committee on Fisheries in February 1999, an International Plan of Action on this subject (IPOA-SHARKS) was adopted. Following this decision, Japan developed its National Plan of Action (Shark-plan) through examination and deliberation by the national discussion committee as well as discussion within the government, and reported it to the 24th FAO Committee on Fisheries in March 2001. Japan is now striving to ensure scientific knowledge and information regarding shark resources under this National Plan of Action, and also to ensure rational conservation and sustainable use of shark resources based on such proper knowledge. This document reports to the 25th FAO Committee on Fisheries in February 2003 about assessment of the National Plan of Action and the situation of its implementation in accordance with paragraph 28 of the IPOA-SHARKS. 2 1. Skates 1) Fisheries harvesting skates This species is harvested by kasube gillnet and also caught incidentally by trawling and flounder gillnet fishery. In Hokkaido, they are found largely along the coast of the Okhotsk Sea and the Sea of Japan. Along the coast of the Pacific coast, it is caught incidentally with other species of Raja (Nagasawa/Torisawa 1991). According to the catch statistics for 1968-2000, catch volume in the Soya District is high with 41% of the total.
    [Show full text]
  • Reproductive Strategies of the Big Skate (Beringraja Binoculata) with Evidence of Multiple Paternity
    California State University, Monterey Bay Digital Commons @ CSUMB Capstone Projects and Master's Theses Capstone Projects and Master's Theses Summer 2019 Reproductive Strategies of the Big Skate (Beringraja Binoculata) with Evidence of Multiple Paternity Jessica Ja-Jei Jang California State University, Monterey Bay Follow this and additional works at: https://digitalcommons.csumb.edu/caps_thes_all Recommended Citation Jang, Jessica Ja-Jei, "Reproductive Strategies of the Big Skate (Beringraja Binoculata) with Evidence of Multiple Paternity" (2019). Capstone Projects and Master's Theses. 727. https://digitalcommons.csumb.edu/caps_thes_all/727 This Master's Thesis (Open Access) is brought to you for free and open access by the Capstone Projects and Master's Theses at Digital Commons @ CSUMB. It has been accepted for inclusion in Capstone Projects and Master's Theses by an authorized administrator of Digital Commons @ CSUMB. For more information, please contact [email protected]. REPRODUCTIVE STRATEGIES OF THE BIG SKATE (BERINGRAJA BINOCULATA) WITH EVIDENCE OF MULTIPLE PATERNITY _______________ A Thesis Presented to the Faculty of the School of Natural Sciences California State University Monterey Bay _______________ In Partial Fulfillment of the Requirements for the Degree Master of Science in Master of Science _______________ by Jessica Ja-Jei Jang Summer 2019 CALIFORNIA STATE UNIVERSITY MONTEREY BAY 1 The Undersigned Faculty Committee Approves the Thesis of Jessica Ja-Jei Jang: REPRODUCTIVE STRATEGIES OF THE BIG SKATE (BERINGRAJA
    [Show full text]
  • Towards TAC-Based Fisheries Management in Korea - Experiences and Challenges
    Towards TAC-based Fisheries Management in Korea - Experiences and Challenges Jungsam Lee Co-organized with the Republic of Korea's Ministry of Ocean in Fisheries October 2, 2018 Contents 1. Production and Policy Goals 2. Introduction of TAC-based Management 3. Expansion and Operation 4. Is TAC-based Management Successful? 5. Current Issues and Future Direction 1. Production and Policy Goals Korea World Decreasing Capture Fisheries Production Fisheries Capture Decreasing x 10000M/T x 10000M/T 10,000 100 150 200 2,000 4,000 6,000 8,000 50 0 0 1970 1971 1950 1972 1952 1973 1954 1974 1975 1956 1976 1958 1977 1960 1978 1979 1962 1980 1964 1981 1966 1982 Aquaculture 1983 1968 1984 1970 1985 1972 1986 1987 Aquaculture 1974 1988 1976 1989 1990 1978 1991 1980 1992 1982 1993 Capture 1984 Coastal& Offshore 1994 1995 1986 1996 1988 1997 *Seaweed included *Seaweed 1998 1990 1999 1992 2000 1994 2001 2002 1996 2003 1998 2004 2000 2005 2006 2002 2007 2004 2008 2006 2009 2010 2008 2011 2010 2012 2012 9,246 2013 170 9,043 106 4 2014 2015 Transition of Fisheries Policy Goals (1970~ 1986) (1987 ~ 1996) (1997~Present) Rapid growth Stagnant Declining period period period Environmental • Increasing harvests • Excessive fishing efforts • Decreased fishing change • Environmental grounds contamination • Depleted fish stocks • Decreased fishing grounds More Production Business Stabilization Sustainable Fisheries Policy goals • Vessel construction • Restructuring started • Intensive restructuring and modernization • Cost reduction • Stock enhancement • Renewing
    [Show full text]
  • Papers Published in Japanese Journal of Ichthyology
    Papers Published in Japanese Journal of Ichthyology Vol. 66, No. 1, April 25, 2019 CONTENTS Original Papers First Japanese record of Sargocentron iota (Beryciformes: Holocentridae) from Kakeroma Island, Amami Islands, Japan Kiyoshi Hagiwara and Hiroyuki Motomura Host mussel suitability for the endangered Itasenpara bitterling Acheilognathus longipinnis (Cyprinidae, Acheilognathinae) in the Moo River and a conservation pond in Himi, Toyama Masaki Nishio, Ryosuke Kawakami and Tomonori Kawamoto Current status of two closely related Phoxinus species, in the Ishi River (Yamato River basin), Osaka Prefecture, Japan Hiroaki Hata, Tomohiko Fujita, Shun Watanabe and Kazumi Hosoya Genetic population structure and morphological differences in the mottled skate Beringraja pulchra Ryo Misawa, Nozomu Muto, Tomonori Hamatsu, Jin-Koo Kim and Yoshiaki Kai Ontogenetic morphological changes in artificially-reared larvae and juveniles of the freshwater goby Rhinogobius kurodai Kentarou Hirashima Molecular identification of the closely related gobies Tridentiger brevispinis and T. obscurus using nuclear DNA markers Yoshio Tani, Ryotaro Hayashi, Kazuto Takada, Kousuke Oji, Yuki Irie, Takumi Imamura, Yu Hayakawa and Takahiko Mukai Rhinogobius biwaensis (“Biwayoshinobori”) × Rhinogobius sp. BF (“Shimahireyoshinobori”) hybrids from the ponds of Sento Imperial Palace, Kyoto City, Japan Akihito, Masahiro Aizawa, Yuji Ikeda, Munenori Kishida, Masayoshi Hayashi, Kouji Nakayama and Tetsuji Nakabo Effects of fixed and seasonal weirs on the distribution and movements
    [Show full text]
  • Bibliography Database of Living/Fossil Sharks, Rays and Chimaeras (Chondrichthyes: Elasmobranchii, Holocephali) Papers of the Year 2015
    www.shark-references.com Version 04.02.2016 Bibliography database of living/fossil sharks, rays and chimaeras (Chondrichthyes: Elasmobranchii, Holocephali) Papers of the year 2015 published by Jürgen Pollerspöck, Benediktinerring 34, 94569 Stephansposching, Germany and Nicolas Straube, Munich, Germany ISSN: 2195-6499 DOI: 10.13140/RG.2.1.3771.1125 copyright by the authors 1 please inform us about missing papers: [email protected] www.shark-references.com Version 04.02.2016 Abstract: This paper contains a collection of 786 citations (no conference abstracts) on topics related to extant and extinct Chondrichthyes (sharks, rays, and chimaeras) as well as a list of Chondrichthyan species and hosted parasites newly described in 2015. The list is the result of regular queries in numerous journals, books and online publications. It provides a complete list of publication citations as well as a database report containing rearranged subsets of the list sorted by the keyword statistics, extant and extinct genera and species descriptions from the years 2000 to 2015, list of descriptions of extinct and extant species from 2015, parasitology, reproduction, distribution, diet, conservation, and taxonomy. The paper is intended to be consulted for information. In addition, we provide information on the geographic and depth distribution of newly described species, i.e. the type specimens from the year 1990- 2015 in a hot spot analysis. Please note that the content of this paper has been compiled to the best of our abilities based on current knowledge
    [Show full text]