Spatial variation in life history characteristics of common megrim (Lepidorhombus whiffiagonis) on the Northern Shelf |
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| Institution: | 1. NAFC Marine Centre, Marine Science & Technology Department, Port Arthur, Scalloway, Shetland, ZE1 0UN, Scotland, UK;2. University of Aberdeen, School of Biological Sciences, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, Scotland, UK;1. Faculty of Agriculture, Tottori University, 4–101 Koyama-cho, Tottori, 680-0945, Japan;2. JICA/JOCV Botswana Office, Private Bag 00369, Gaborone, Botswana;3. Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Nakagami-gun, Okinawa, 903–900213, Japan;4. Department of Agricultural Research, Ministry of Agriculture, Private Bag 0033, Gaborone, Botswana;5. Japan Overseas Cooperative Association, 5th Floor, Nihon Seimei Ichibancho bldg., 23–3 Ichiban-cho, Chiyoda, Tokyo, 102-0082, Japan;6. United Graduate School of Agricultural Sciences, Tottori University, 4–101, Koyama-Minami, Tottori, 680-8553, Japan;7. Faculty of Science, University of Botswana, Private Bag 0022, Gaborone, Botswana;1. Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Argentina;2. Instituto deInvestigaciones Marinas y Costeras (IIMyC), FCEYN, UNMDP-CONICET. Mar del Plata, Argentina;1. Department of Applied Economics, University of Vigo, Vigo 36310, Spain;2. Institute of Estuarine & Coastal Studies (IECS), University of Hull, Hull HU6 7RX, UK;3. Environment Department, Wentworth Way, University of York, Heslington, York YO10 5NG, UK;4. Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal;1. Institute of Oceanography, Hellenic Centre for Marine Research, Former American Base of Gournes, Heraklion 71003, Greece;2. Department of Biology, University of Crete, Heraklion 71409, Greece;3. Institute of Oceanography, Hellenic Centre for Marine Research, 46.7km Athinon-Souniou Ave., Anavyssos 19013, Greece;4. Department of Oceanography, University of Hawaii, 1000 Pope Road, Honolulu, HI 96822, USA;5. Institute of Marine Biological Resources and Inland Waters, Hellenic Centre for Marine Research, Agios Kosmas, 16610 Elliniko Athens, Greece;1. Remote Sensing Group, Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK;2. Scottish Natural Heritage, Great Glen House, Inverness IV3 8NW, UK |
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| Abstract: | In recent years stock structure recommendations for megrim on the Northern Shelf have varied, primarily due to a lack of biological and fishery data. In this study, we compared a number of life history characteristics of the common megrim Lepidorhombus whiffiagonis (Walbaum) between the northern North Sea and Rockall, the latitudinal extremes of the species’ distribution on the Northern Shelf. Reproductive timing, sex ratio, maturity and growth were different between the two study areas. Reproductive timing in the northern North Sea was more protracted than at Rockall and other areas. There were differences in sex ratio between the study areas and female megrim in the northern North Sea exhibited different growth rates and larger size at maturity than at Rockall. The results of this study support the recent changes to the definition of the Northern Shelf stocks which recommend that the northern North Sea be treated separately to Rockall. |
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