Oslofjord, Nature and environment | Found 50 billion larvae in the Oslo Fjord: – Looked like a bowl of spaghetti
– There is probably always a little Tobis in the Oslo Fjord, but we have not found that much before. Now we have found huge amounts, says researcher at the Institute of Marine Research, Sigurd Heiberg Espeland to Avisa Oslo.
On a cod trip in the Oslo Fjord, Espeland and his colleagues found an average of 40–50 sandeel larvae per square meters – to be exact, he says.
– If you have to convert it to the area we covered, it means approx. 50 billion larvae. It looked like a bowl of spaghetti, he says.
The larvae can be good news for hungry cod and fish in the Oslo Fjord.
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Came from Denmark
Sandeel is a collective term for several species within the silver family. The small fish lives on a sandy bottom. It most likely came with the ocean current from Denmark, Espeland explains.
– They like to live a bit like that, half buried in sand and that’s a lot of it outside Denmark. We guess they come from there because it was so incredibly much.
Many fish release their eggs freely into the water. They do not provide parental care and the children are allowed to sail their own sea, he continues.
– When the fish lays eggs and larvae that way, it is taken by ocean currents. Our theory is that the Danish sandeel fish have released a lot of eggs and larvae, which have been driven up by the coastal current.
– That’s how it is in nature. Sometimes it’s really a lot of things. It can be strategy on the part of the animals. They just poke around hoping someone will survive.
Becomes dull to other fish
But whether it will be Tobisfisk of all the larvae is not certain.
– The fish release many more children than can grow up. The vast majority die. It’s a natural thing, but on the way they can become food.
– How positive is this for the Oslo Fjord?
– If it is not founded for the mass of Tobis in the future, then it represents at least for other animals in the Oslo Fjord.
– Where does the journey go for all the little Tobis larvae? Will they stay in the Oslo Fjord?
– We are a little unsure of how they will develop further. When we caught them, they swam freely, but eventually they will search to the bottom and find better places to live.
– It’s nice if they become food for the cod. But we do not know. In any case, it is not stupid that there are soft, fine larvae that are easy to eat and can not defend themselves sailing into the Oslo Fjord, he chuckles.
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