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return true" onmouseout="window.status=''; return true">Underwater Tagging Equipment</a> > </div> <p><b><span class="header1">More than 200 redfish tagged at 500m depth</span></b><span class="header1"><br /> </span><br /> The Marine Research Institute in Reykjavk (MRI) and Star-Oddi have in collaboration developed the Underwater Tagging Equipment (UTE). The main reason for the development is due to the unknown stock structure of Sebastes mentella redfish, stock components in the Irminger Sea and along the shelf and slopes of Iceland, Greenland and the Faeroe Islands. As long as the stock structure and possible interrelation between possible stock components remain unknown, it will always be difficult to assess the status of the stock(s) and to give reliable advice on how to manage this important resource.</p> <p>I<img style="margin-bottom: 5px; margin-right: 5px" title="" border="0" alt="" align="left" src="/resources/Images/redfish.JPG" />nvestigating species such as redfish is always difficult&nbsp;for many reasons.&nbsp; One of the reason is problems with the tagging, as redfish species can not be tagged with traditional methods that involve bringing the fish to the surface. The swimbladder of the fish can't release the air of the bladder fast enough&nbsp;to adjust to&nbsp;decreased pressure.&nbsp;The swimbladder enlarges as the pressure decreases, air bubbles develop in the blood circular system and the guts invertes, killing the fish.&nbsp;In the outcome of this project&nbsp;we were&nbsp;hoping to be able to answer some of the basic questions raised, such as growth, interactions between stocks, migration patterns, horizontal and vertical distribution. By achieving these goals we obtain much better understanding on the stocks of redfish that are exploited in the area.&nbsp; As a consequence of a better general knowledge on the behavioural pattern and stock structure, we also hope to improve the advice on how to manage these resources. <br /> </p> <p align="center">&nbsp;</p> <p><br /> Since 1998, 7 surveys have been conducted for testing the equipment and the device works as a tool for tagging fish at great depths. In the last survey conducted on a research vessel from 21. -26. October 2003, we managed to tag more than 200 redfish with a bottom trawl at well known fishing ground, SW of Iceland. During the survey we tagged the fish at depths of more than 500m.&nbsp; The fish lengths were estimated, from video data, to be from 32-45 cm.</p> <p align="center"><img style="width: 252px; height: 170px" title="" border="0" alt="" width="314" height="175" src="/resources/Images/100_0774.jpg" />&nbsp;&nbsp;&nbsp; <img style="width: 238px; height: 171px" title="" border="0" alt="" width="294" height="171" src="/resources/Images/100_0796.jpg" />&nbsp;&nbsp;&nbsp;&nbsp;<img style="width: 250px; height: 171px" title="" border="0" alt="" width="216" height="150" src="/resources/Images/4-UTE-on-board-again.jpg" />&nbsp;&nbsp;&nbsp;&nbsp;<img style="width: 240px; height: 172px" title="" border="0" alt="" width="504" height="176" src="/resources/Images/P1010002.jpg" /></p> <p>In addition to development of the UTE, survival rate of tagged fish has been tested.&nbsp; As it is difficult to measure survival of species that we can't bring alive to a cage, experiments on survival rate were done on cod, using the same technique as when tagging redfish.&nbsp; The experiment was conducted in a pisciculture and 20 fish were tagged.&nbsp; The fish was cut with a knife and tag placed in the body cavity of the fish.&nbsp; All of the fish survived the tagging and none of them died during the next 3 weeks when the experiment was terminated.</p> <p>We have already recaptured&nbsp;tagged redfish&nbsp;from the tagging cruise, the redfish was tagged at approximetely 500m depth&nbsp;which confirms that the redfish survives this treatment, as&nbsp;does cod.<br /> <br /> Thorsteinn Sigurdsson (steini@hafro.is)<br /> Marine Research Institute, Reykjavk.<br /> <br /> Back to the <a href="http://www.star-oddi.com/products/35/deepwater-tagging/default.aspx">Underwater Tagging Equipment</a> product site.</p></div> </div> </div> </div> </div> </div> </div> <div class="secondary-content-2"> <div class="extra-info" > <div class="extra-info-t"> <div class="extra-info-b"> <div class="title"><h3>Aquatic & Fisheries Research</h3></div> <div class="sep-info"> <ul class="tree-link"> <li class="level4 first"><a href="/Products/" target="_self" onmouseover="window.status='Products'; return true" onmouseout="window.status=''; return true">Products</a></li> <li class="level5"><a href="/Products/" target="_self" onmouseover="window.status='Data Sorage Tags'; return true" onmouseout="window.status=''; return true">Data Sorage Tags</a></li> <li class="level5"><a href="/products/default.aspx?sensor=Temperature" target="_self" onmouseover="window.status='Temperature Recorders'; return true" onmouseout="window.status=''; return true">Temperature Recorders</a></li> <li class="level5"><a href="/products/35/deepwater-tagging/default.aspx" target="_self" onmouseover="window.status='Underwater Tagging Equipment'; return true" onmouseout="window.status=''; return true">Underwater Tagging Equipment</a></li> <li class="level5"><a href="/products/accessories-2/" target="_self" onmouseover="window.status='Accessories'; return true" onmouseout="window.status=''; return true">Accessories</a></li> <li class="level4"><a href="/Home/Aquatic-Fisheries-Research/Fish-and-Marine-Animal-Tagging/" target="_self" onmouseover="window.status='Fish and Marine Animal Tagging'; return true" onmouseout="window.status=''; return true">Fish and Marine Animal Tagging</a></li> <li class="level4"><a href="/Home/Aquatic-Fisheries-Research/Oceanography-Aquaculture/" target="_self" onmouseover="window.status='Oceanography &amp; Aquaculture'; return true" onmouseout="window.status=''; return true">Oceanography &amp; Aquaculture</a></li> <li class="level4"><a href="/Home/Aquatic-Fisheries-Research/Scientific-Papers/" target="_self" onmouseover="window.status='Scientific Papers'; return true" onmouseout="window.status=''; return true">Scientific Papers</a></li> <li class="level4"><a href="/Home/Aquatic-Fisheries-Research/Online-Education/" target="_self" onmouseover="window.status='Online Education'; return true" onmouseout="window.status=''; return true">Online Education</a></li> <li class="level4"><a href="/Order-Now/" target="_self" onmouseover="window.status='Order Now'; return true" onmouseout="window.status=''; return true">Order Now</a></li> </ul> </div> </div> </div> </div></div> </div> </div> </div> <div class="page-b"></div> <div id="footer"> <ul class="contact-info"> <li>Skeidaras&nbsp;12</li> <li>210 Gardabaer</li> <li>Iceland</li> <li>Tel: +354 533 6060</li> <li><a href="/Contact/">Contact</a></li> </ul> <ul class="links"> <li><a href="/Careers/">Careers</a></li> <li><a href="/Media/">Media</a></li> <li><a href="/Sitemap/">Sitemap</a></li> </ul> </div> </div> <!-- Yahoo! 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