smolt release

Smolt release

Smolt release is one of the important indicators on future harvest quantities as it takes up to 2 years from the smolt is transferred to the sea before the fish is harvested.

Due to limited spare capacity in the current MAB regime in Norway, we can see that smolt release did not grow much in 2011-14.

 

If we look at the current year’s transfers. May is the heaviest” month of the year (~20% of annual release).

 

This is how smolt release in Norway look at a 12-month trailing basis.

 

Remember, though, that depending on issues like seawater temperatures and access to large-sized smolts (considered to be more robust), farmers can choose to postpone or push forward smolt release by 1-2 months.

Hence, looking at the 12-month trailing number does not always provide the right signal about growth in future harvest volumes.

If no actual numbers on smolt releases are available, vaccine sales could be a good indicator of number of smolt releases

With smolt transfers you can estimate future harvest

Some of the below is borrowed from the MHG Industry Handbook 2013 which is found here

  • The three most important indicators on future harvest quantities are standing biomass, feed sales and smolt release. If no actual numbers on smolt releases are available, vaccine sales could be a good indicator of number of smolt releases and when the smolt is put to sea. This is a good indicator on long term harvest as it takes up to 2 years before the fish is harvested after smolt release.
  • A smolt is produced over a 6-12 months period from the eggs are fertilised to a mature smolt with weight of 60-100 grams. Recently, farmers have begun to produce and┬árelease smolts that are larger than 100 grams, allowing for earlier release and reducing the time in the sea.
  • In Norway, smolt is mainly released into seawater twice a year. They are called S0s and S1s. The S0s are released in spring and the S1s in the autumn.
  • After a site is harvested, the location is fallowed between 2 and 6 months before the┬ánext generation is put to sea at the same location. Smolt may be released in the same location with a two year cycle.

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