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CURAÇAO – Een groot aantal vissoorten is gesignaleerd dat lijkt te kampen met ziektesymptonen. Het maritiem wetenschappelijk instituut Carmabi laat weten dat plantenetende vissen het meest getroffen zijn door deze symptomen. Onder andere chirurg- en papagaaivissen lijden er onder.

Er zijn twee verschillende soorten ziektes gesignaleerd. De eerste ziekte is in het verleden al eerder geconstateerd bij chirurgvissen, maar is nu ook aangetroffen bij de vissoorten grunts en hamlets.

De getroffen vissen zijn bedekt met ronde donkere vlekken en zijn meestal donkergrijs of zwart. Er zijn ook verschillende andere vissen gesignaleerd met witte stippels op hun vinnen en lichaam. Op sommige locaties zijn er geen enkele getroffen vissen te zien, terwijl in een ander gebied 30 procent van de vissen deze symptomen hebben.

Volgens Mark Vermeij, wetenschappelijk directeur van het instituut, zijn deze symptomen nog niet eerder aangetroffen op Curaçao. Verweij verzoekt iedereen die denkt meer informatie te hebben over deze situatie een e-mail te sturen naar carmabilog@gmail.com.

2 reacties op “Vissen vertonen ziektesymptonen”

  1. and our lionfish problem is really out of control….

    Revelation 16:3

  2. Black Ich or Black Spot Disease is actually an infestation of tiny Paravortex turbellarian flatworms, and even though the name Tang Disease implies it is ususally associated with Tangs and Surgeonfishes, it can effect other species. Although the worms are rather easy to get rid once they appear as black dots on fish, they can survive for several months without a host, and therefore can be difficult to eliminate .

    White Spot Disease or Saltwater Ich is caused by an infestation of the ciliated protozoan Cryptocaryon irritans. The ciliate protozoan Cryptocaryon irritans Brown, 1951, the ‘marine white spot’, causes one of the most important parasitic fish diseases, with extensive losses every year in mariculture and in the ornamental fish industry. In the present study, we explore the in vitro use of 8 different compounds against the theront (infective) stage of C. irritans; these compounds include extracts of natural products (epigallocatechin gallate (EGCG), L-DOPA, papain), peracetic acid-based compounds (Proxitane 5:23 and 15% peracetic acid, PAA), quinine-based compounds (quinacrine hydrochloride and chloroquine diphosphate) and hydrogen peroxide. All of these compounds had an effect on theront survival; however, only EGCG caused significant theront mortality when applied in doses > or =50 mg l(-1) and over a period of 3 h; papain caused a maximum theront mortality of <50%. We discuss the type of application and potential utility of the compounds tested as part of a management control strategy for C. irritans infections in marine aquaculture and the ornamental fish industry.

    The trophont stage is seen as the mature parasite attached to the fish, feeding off fish tissue. This has the appearance of salt-like grains often described by hobbyists as white spots or white dots; here is where the common name of the disease, “white-spot disease”, comes from. What the hobbyist is actually seeing with these white dots is a protective covering, or cyst, which the parasite creates over itself as a means of protection. The parasites’ defense mechanism. As the parasite feeds and grows, so do these white encasings grow in size. It is this growth or varying sizes of the trophont that may confuse the hobbyist to think that the infected fish is suffering from some other malady [such as lymphocystis]. The visible distinction between ich, and some other problem, is usually numbers. Left untreated, ich will multiply on the fish and usually cover the body—fins and body alike. Cycle timeframe: approximately 7 days

    The protomonts stage occurs when the trophont mature after having fed on fish for about a week. At this point, the parasite, engorged and well-fed, detaches its protective cystic covering, leaves the host fish and swims in the water column for several hours until it can find a place in the aquarium to settle. It will then attach itself to a surface in the aquarium: sand, live rock and, even the surface of rocks where coral are attached, hard-shelled invertebrates, or even the aquarium glass, filters, whatever. Once settled, the cells within the cyst begin dividing to form more parasites [up to several hundred]. Cycle timeframe: several hours

    The tomite stage, are the products of the parasite reproducing. They become free-swimming in the aquarium as theronts. Cycle timeframe, approx 4 days at 77-80 degrees water temperture