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Agricultural University of Iceland > Rafræn tímarit > Búvísindi = Icelandic agricultural sciences >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1946/19912

Title: 
  • Effects of different environmental shading on the cultivable bacterial community and survival of first feeding Atlantic halibut larvae
  • Title is in Icelandic Skygging eldisumhverfis - áhrif á ræktanlega bakteríuflóru og afkomu lúðulirfa í startfóðrun
Keywords: 
Published: 
  • 2011
Abstract: 
  • High mortality rates commonly observed during the early life stages of intensively reared Atlantic halibut have among other things been related to high bacterial numbers and an unfavourable bacterial community. The study describes the effects of two different methods for environmental shading on larval survival and numbers of cultivable bacteria in the culture water and the gastrointestinal tract of first feeding larvae at Fiskey Ltd. Larval survival was not affected by the method used for environmental shading. Lower bacterial numbers were observed in the tank water with environmental shading provided by inorganic clay as compared with marine algae, primarily during the first days of exogenous feeding. Gram negative, fermentative bacteria dominated the cultivable community in the gastrointestinal tract of larvae during the first weeks in feeding. The use of inorganic clay has clear economic advantages as compared to the use of marine microalgae, and the commercial producer has used the product exclusively for environmental shading during first feeding of halibut larvae since 2003.

  • Abstract is in Icelandic

    Mikil afföll sem verða á fyrstu stigum lúðueldis hafa meðal annars verið tengd fjölda baktería og óæskilegri samsetningu bakteríuflóru. Rannsóknin fjallar um áhrif tveggja mismunandi aðferða við skyggingu eldisumhverfis á afkomu lúðulirfa og fjölda ræktanlegra baktería í eldisvökva og meltingarvegi lirfa hjá Fiskey hf. en fyrirtækið hefur um árabil verið stærsti framleiðandi lúðuseiða á heimsvísu. Ekki var munur á afkomu lirfa í meðferðarhópunum. Fjöldi baktería í eldisvökva lirfa var minni þegar leir var notaður til skyggingar samanborið við notkun þörunga, sér í lagi fyrstu dagana í fóðrun. Gram neikvæðar, gerjandi bakteríur voru ríkjandi hluti ræktanlegrar flóru í meltingarvegi lirfa fyrstu vikurnar í fóðrun. Sparnaður er af notkun leirs samanborið við þörunga og hefur lúðuseiðaframleiðandinn alfarið notað ólífrænan leir til skyggingar eldisvökva við frumfóðrun lirfa frá árinu 2003.

Citation: 
  • Icelandic agricultural sciences 24, 33-41
ISSN: 
  • 1670-567x
Accepted: 
  • Oct 14, 2014
URI: 
  • http://hdl.handle.net/1946/19912


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