ensv

CONSERVATION

Havets Hus is strongly committed to preserve two endangered species in the West Coast seas: lesser spotted dogfish and thornback ray. In our tanks, you can follow them closely.

010

Lesser spotted dogfish is a Swedish shark species that has drastically decreased in number. In the current situation, it is absolutely prohibited to catch and land the lesser spotted dogfish in Swedish waters. However, it is important that fishermen who happen to catch it continue to report the occurrence of the species. The Swedish Museum of Natural History in Stockholm compiles all the information about it.

At Havets Hus you find lesser spotted dogfish displayed in four public aquariums: An egg-aquarium where you can follow the development of the egg, a youth aquarium and two larger aquariums where they swim together with other animals.

Since 2002, we have replanted about 60 sharks raised in aquariums into the Gullmar fjord, together with the Swedish University of Agricultural Sciences (SLU) (formerly Board of Fisheries). By replanting branded sharks we hope to increase awareness of their habits, as well as increasing the number of sharks in our area. So far we have only had three recaptures, which we choose to see as a good sign. Hopefully the tagged sharks swim around in the sea and help increase the population.

rocka

The thornback ray is endangered in both Swedish and European waters. Today it is completely forbidden to catch and land thornback rays in Swedish waters. Due to its size, it easily gets caught in trawling nets.

Already at age one, the thornback ray is large enough to get caught by mistake. In addition to trawling, changes in habitat or food shortages may be possible reasons for its sharp decline.

It is difficult for the thornback ray to recover, partly because it reaches sexual maturity late and also because its reproduction rate is very low.

At Havets Hus, we have several large thornback rays. In March 2015 two male thornback rays were donated to Havets Hus from the Aquarium in Ålesund, Norway. This means we now can begin the preparation for a new reintroduction program for the thornback ray.

In januari 2016 was the first thornbak ray born in the aquarium of Havets Hus.


↑