Perhaps unsurprisingly, these fish were once popular as pets. However, their destructive potential was overlooked because of their beauty and the spread of the lionfish populations beyond their native range is now considered to be one of the worst marine invasions ever.
This weeks invader, commonly known as the Japanese Skeleton Shrimp, is native to the waters of northeast Asia. It was first reported outside of its native habitat in the 1970’s around the Pacific and Atlantic coasts of North America, and can now commonly be found in North America, Western Europe and more recently in New Zealand.
The United States Coast Guard (USCG) has denied appeals filed by four UV based ballast water treatment (BWT) manufacturers to allow the Most Probable Number (MPN) analysis method in USCG Type Approval testing.
This weeks invader, more commonly referred to as Dead Mans Fingers, is native to the Pacific Ocean around Japan and Korea. However it was first found in Ireland in 1808, and 30 years later in Scotland. It made an appearance on the shores of the Netherlands just before 1900 and can now be found throughout Europe and along the east coast of the US, from the Gulf of St Lawrence all the way to North Carolina. It is not entirely clear how the species came to travel so far, but it is thought that fouling of ships hulls played a …
In a further twist to what is a hot topic in ballast water treatment – MPN vs CMFDA test methods for ballast water management systems – the Canadian government has confirmed its backing of the MPN method…
This jellyfish-like creature originates from the Atlantic coastal waters of North and South America. However, in 1982 it was spotted in the Black Sea, and it subsequently spread to the Caspian Sea, the North Sea and the Mediterranean Sea.
Tridentiger trigonocephalus, or the Chameleon Goby, is native to the eastern coast of Asia. It was first spotted in Los Angeles in 1960, and can now also be found in the Mediterranean Sea, the Black Sea and Australia.
This weeks invader is native to the Mediterranean and Northeastern Atlantic ocean. It is a filter-feeding tube worm that can form vast meadows across the sea floor. It is considered an invasive species in Australia, where it was first seen in 1965. The species is thought to have been introduced both as larvae in ballast water and adults attaching themselves to ships hulls. Their presence can be a nuisance as they can reduce fish numbers, destroy aquaculture and clog dredges and nets. They also excrete nitrogen which encourages the growth of algal blooms. (Photo courtesy of scienceimage.csiro.au)
Didemnum Vexillum is thought to be native to Japan, but since the 1990’s there has been a significant increase of the species in North America and Europe.
Peru has finally acceded to the IMO Ballast Water Convention, making them the 51st state to do so. Their accession coincided with the IMO’s end of May global tonnage figures, which also indicated a slight increase in the ratification percentage from the end of April figures.