The free-to-download publication follows on from the FISHWELL handbook on welfare indicators for farmed Atlantic salmon, which was released in 2018.

Part A gives an overview of fish welfare, outlines what is known about the welfare needs of each species, and conditions that may affect the fulfilment of these needs.

Part B outlines fit-for-purpose welfare indicators for assessing fish welfare in different production systems, such as sea cages and flow-through production systems. Part C adopts the same approach and assembles welfare indicator toolboxes for different routines and operations, such as pumping, crowding, grading, vaccination and slaughter.

“We tried to make Part B very practical and user-friendly. Farmers are often very busy, and we wanted them to get a detailed yet effective overview of relevant welfare indicators for their differing production systems,” says Jelena Kolarevic, a scientist at Nofima.

“Handling a group of fish often requires a set of sub-operations or routines. The WI toolboxes in Part C are set up to give you some guidelines on how and why they should be used. For example, if you plan to perform a mechanical de-licing operation, you should look at the section on mechanical and thermal de-licing in the new technology part of the handbook in addition to sections on feed withdrawal, crowding, pumping and the examination of live fish. This is to ensure the welfare of the fish are monitored in every step of the de-licing process,” says Kristine Gismervik, veterinarian and scientist at the Norwegian Veterinary Institute.

The FISHWELL handbooks are a collaboration between fish welfare researchers and veterinarians at the food research institute Nofima, the Institute of Marine Research (IMR), the Norwegian Veterinary Institute (NVI), Nord University (all of which are based in Norway) and the University of Stirling in the UK. The trout handbook is 310 pages long and can be downloaded for free from Nofima’s website.

“Atlantic salmon and rainbow trout dominate farm animal production in Norway and are key aquaculture species in many other countries. There is increasing interest in their health and welfare from a wide range of stakeholders, including those working within aquaculture, the R&D community and society in general,” says Lars Helge Stien, a senior scientist at the Institute of Marine Research.

“Our aims when we started the project were to review and evaluate the range of differing existing and emerging welfare indicators for assessing the welfare of farmed salmon and trout. We then assembled welfare indicator toolboxes for the wide range of production systems and operations that the fish are subjected to,” said Chris Noble, a senior scientist at Nofima who led the project.

The two handbooks follow the same format.

“Whilst there are many similarities between Atlantic salmon and rainbow trout in terms of their welfare needs, there are also many differences in, for example, their responses and behaviour that needed to be addressed in each book,” says Martin Iversen, associate professor at Nord University.

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