The purpose of mapping the spatial distributions and temporal trends of fish and shellfish diseases is to give people, e.g., scientists, managers, laypersons and politicians, having interest in or needing information on this field the possibility of obtaining a rapid overview.

The work was carried out through the Working Group on Pathology and Diseases of Marine Organisms (WGPDMO) and the material is based on national reports provided by the WGPDMO members.

The data were processed by W. Wosniok (Germany), T. Lang (Germany), and S. Mellergaard (Denmark).

DISCLAIMER- WARNING It should be noted that these illustrations of the spatial distribution and the temporal trends are gross overviews and will not allow for detailed interpretations on a local scale.

Maps are presented to show the distribution of diseases of the fish and shellfish. If you prefer you may download the original Word document.

In future, it is the intention to further expand these illustrations to include other diseases of fish and shellfish.

Dab (Limanda limanda).

The following maps illustrate the spatial and temporal changes in the distribution of externally visible diseases in common dab over the period 1993-1997. These data were extracted from the fish disease database of the ICES Environmental Centre.

Map 8.1- illustrates the geographical distribution of source data used to analyse the trends in prevalence of externally visible diseases of the common dab.

Map 8.2- illustrates the temporal trends in the prevalence of lymphocystis (a viral disease affecting the skin) in common dab, over the period 1993-1997.

Map 8.3- illustrates the temporal trends in the prevalence of epidermal hyperplasia/papilloma (a disease affecting the surface layer of the skin) in common dab, over the period 1993-1997.

Map 8.4- illustrates the temporal trends in the prevalence of acute/healing skin ulcerations (a bacterial disease) in common dab, over the period 1993-1997.

 

Marine VHS-Like Virus

Viral Haemorrhagic Septicaemia is a disease primarily affecting farmed salmonids. However, VHS-like viruses have increasingly been isolated from a wide range of wild marine fish specie

Map 8.8- Illustrates the geographical distribution of marine VHS-like virus.

The mollusc diseases presented on the following maps were selected because they constitute some of the most important diseases in oyster culture.

Flat oyster (Ostrea edulis)

Map 8.5 - illustrates the geographical distribution of Bonamia ostreae, an intracellular parasite, which affects the haemocytes (blood cells) of the flat oyster.

Map 8.6- illustrates the geographical distribution of Marteilia refringens, a haplosporidium (parasite) which affects the digestive system of the flat oyster.

Eastern Oyster (Crassostrea virginica)

Map 8.7 - illustrates the geographical distribution of Perkinsus marinus, an intracellular parasite which affects the haemocytes (blood cells) of the eastern oyster.

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