Íslenskar landbúnaðarrannsóknir


Íslenskar landbúnaðarrannsóknir - 01.09.1978, Qupperneq 175

Íslenskar landbúnaðarrannsóknir - 01.09.1978, Qupperneq 175
SALMON MANAGEMENT AND OCEAN RANCHING 1 73 stream there is a circulation system which will return the salmon after 1 year’s feed- ing in the sea, or 2 if the current branch which swings over to Norway is followed (Fig. 10). The feeding area in this would be largely the Polar front vacated by the disappearance of the Atlanto-Scandian stock of herring. The mixing of cold Arctic and warm Atlantic water provides the im- petus for rich food production, as is the case in the Denmark Strait. The hypotheses set forth here are still largely conjectures but could be verified easily by tagging experiments. Feeding salmon should be caught easily with drift longlines with a short ganion about 1 m long. But the knowledge gained elsewhere, especially in the North Pacific Ocean, and the natural explanation of the predominance of 1-ocean salmon in the ÍSLENZKT YFIRLIT Stjórnun laxveiða og laxahafbeit við ísland Ole A. Mathisen College of Fisheries, University of Washington Og ÞÓR GUÐJÓNSSON Veiðimálastofnunin, Reykjavík Laxveiðin á íslandi er fyrst og fremst stangaveiði. Þar af leiðir að aðalhlutverk veiðiyfirvalda er ekki að ná veiðiálagi sem gefur hámarksafrakstur í laxaíjölda hel- dur að halda ánægju veiðimanna í hámarki. Þess vegna.verður alltaf að vera verulega meiri laxafjölda í ánni eftir veiði- Icelandic fishery, make this almost un- necessary. The fact that Iceland possesses two close natural current systems for salmon production holds the greatest promise for the future of ocean ranching. Coupled with this is the disappearance or presently low abundance of other species like herr- ing which formerly utilized the same feeding areas. Conceivably there is no real limit to the magnitude of the production except those imposed by market conditions, availa- bility of smolts, and capital for invest- ments. In spite of these constraints, Ice- land has the possibility and opportunity not only to be among the foremost ocean ranching nations in the world but to re- move the salmon production from the category of luxury item to that of a food supply of great dimensions. tíma heldur en nauðsynlegt er fyrir hrygningu. Ganga Atlantshafslax í íslenzkar ár er mjög regluleg bæði hvað snertir tíma og magn og auðvelt er að líkja eftir henni stærðfræðilega með S — laga ferli saman- lagðrar heildarveiði. Stofnstærðina má áætla eftir afla á sóknareiningu, þegar feng- izt hafa upplýsingar um veiðni veiðitækj- anna og veiðanleika laxins. Þetta fæst ekki nema með því, að telja alla laxa sem ganga í vissar ár og bera saman afla á sóknareiningu fyrir mismunandi veið- imenn og veiðitæki. Erfitt er að stjórna veiðunum eftir að þær eru byrjaðar, þar sem veiðileyfi eru seld löngu fyrir veið- itíma, en þetta kemur ekki að sök þar sem
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Íslenskar landbúnaðarrannsóknir

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