• Amnesic shellfish poisoning in the king scallop, Pecten maximus, from the west coast of Scotland

      Campbell, D.A.; Kelly, M.S.; Busman, M.; Bolch, C.J.S.; Wiggins, E.; Moeller, P.D.R.; Morton, S.L.; Hess, P.; Shumway, S.E. (National Shellfisheries Association, 2001)
      The king scallop, Pecten maximus, is a valuable economic resource in the UK. The industry relies on supplying premium "roe-on" processed scallops to the continental market. In July 1999, king scallops harboring the amnesic shellfish poisoning (ASP) toxin, domnic acid (DA), in gonadal tissue at levels above the regulatory limit (20 μg DA g-1) were detected across a wide area of northern and western Scotland. In response, a survey of the southern extent of the closed harvest areas was initiated to describe variability of ASP toxin levels over varying spatial scales (<5 m to >5 km); determine the anatomical distribution of the toxin, and identify, isolate, and culture causative Pseudo-nitzschia species. Toxin analysis was conducted using a liquid chromatography-tandem mass spectroscopy (LC-MS/MS) procedure. The DA content of tissues followed the predictable rank order: all other tissue -1 gonad -1 adductor. The toxin levels within all other tissue (95% Cl = 580-760 μg DA g-1, n = 170) consistently accounted for 99% of the total individual toxin burden. DA levels in the gonad (95% CI = 8.2-11.0 μg DA g- 1, n = 170) were an order of magnitude below levels in all other tissue and contributed to less than 0.5% of the total individual toxin burden, although levels above the regulatory limit were detected in individual gonad samples. Adductor muscle tissue contained the lowest concentration of DA (95% Cl = 0.38-0.82 μg DA g- 1, n = 170), and was typically within two to three orders of magnitude below levels in all other tissue. None of the scallops examined had DA toxicities in adductor muscle tissue exceeding the regulatory limit. Toxin variability among individuals and sites was high (range of coefficients of variation (CV) in all other tissue = 29&-l20% and gonadal = 45%-85%). The results do give an indication of the scale on which microhabitat differences may influence ASP toxicity in P. maximus populations, because significant differences were found in all other and gonadal tissue toxin levels between groups of individuals only 25-m apart. In total, seven species of Pseudo-nitzschia were identified from west coast waters. A suspected causative species, P. australis, was found to produce high levels of DA, in culture. The high individual variation in toxicities and the occurrence of DA in the gonad at levels above the regula1ory limit clearly demonstrate the complexity of managing the king scallop fishery during ASP events.
    • Analysis of "Independent evaluation of Sea Trout Monitoring Programme"

      Rothschild, B. (1997)
      This report reviews the independent evaluation of the Sea Trout Monitoring Programme performed by Dr. Ian G. Cowx, University of Hull Fisheries Institute dated March 1997.
    • An Analysis of the Gravels used by Spawning Salmonids in Ireland

      Fluskey, R. D. (Department of Agriculture and Fisheries [Fisheries Division], 1989)
      Samples of gravel from 79 sites selected for spawning by Atlantic salmon, 9 selected by sea trout and 13 within spawning areas but known to be unused by spawning salmonids were analysed. For comparison reported data on 81 samples from sites used by Pacific salmon were similarly analysed. No significant difference was found between the range of gravel distributions used by salmon and that used by sea trout. It could not be proved that the sites unused by spawning fish were avoided because of excess coarseness or fineness. The range used by Pacific salmon was found to be wider than that used by Atlantic salmon. A separate analysis was made of the portion of gravel coarser than 4mm in diameter. From this a suitable mixture for use in rehabilitating disrupted spawning areas is proposed. A proposal is made that for spawning gravel analysis the 0scale where 0 = -1.log2 particle size be replaced by a 0 scale where the multiplication by -1 is omitted. Key words: Salmonids, spawning, gravel, site selection.
    • Annual Report 2000

      Marine Institute (Marine Institute, 2001)
      Marine Institute Annual Report for 2000
    • Annual Report 2001

      Marine Institute (Marine Institute, 2002)
      Marine Institute Annual Report for 2001
    • Annual Report 2002

      Marine Institute (Marine Institute, 2003)
      Marine Institute Annual Report for 2002
    • Annual Report 2003

      Marine Institute (Marine Institute, 2004)
      Marine Institute Annual Report for 2003
    • Annual Report 2003 (Irish version)

      Marine Institute (Marine Institute, 2004)
      Marine Institute Annual Report for 2003 (Irish version)
    • Annual Report 2004

      Marine Institute (Marine Institute, 2005)
      Marine Institute Annual Report for 2004
    • Annual Report 2004 (Irish version)

      Marine Institute (Marine Institute, 2005)
      Marine Institute Annual Report for 2004 (Irish version)
    • Annual Report 2005

      Marine Institute (Marine Institute, 2006)
      Marine Institute Annual Report for 2005
    • Annual Report 2005 (Irish version)

      Marine Institute (Marine Institute, 2006)
      Marine Institute Annual Report for 2005 (Irish version)
    • Annual Report 2006

      Marine Institute (Marine Institute, 2007)
      Marine Institute Annual Report for 2006
    • Annual Report 2006 (Irish version)

      Marine Institute (Marine Institute, 2007)
      Marine Institute Annual Report for 2006 (Irish version)
    • Annual Report 2007

      Marine Institute (Marine Institute, 2008)
      Marine Institute Annual Report for 2007
    • Annual Report 2007 (Irish version)

      Marine Institute (Marine Institute, 2008)
      Marine Institute Annual Report for 2007 (Irish version)
    • Annual Report 2008

      Marine Institute (Marine Institute, 2009)
      Marine Institute Annual Report for 2008
    • Annual Report 2008 (Irish version)

      Marine Institute (Marine Institute, 2009)
      Marine Institute Annual Report for 2008 (Irish version)
    • Annual Report 2009

      Marine Institute (Marine Institute, 2011)
      Marine Institute Annual Report for 2009
    • Annual Report 2009 (Irish version)

      Marine Institute (Marine Institute, 2011)
      Marine Institute Annual Report for 2009 (Irish version)