The present invention relates to equipment and systems for a floating fish farm in the sea or ocean. Particularly, the invention relates to a water shield system in a floating fish farm. The invention concerns also a system for collection of fish waste and/or food / feed waste and/or dead fish.Furthermore, the invention teaches a securing system for preventing the farmed fish from escaping into the sea or ocean during different operations with the fish or for other purposes.The present invention relates to equipment and systems for a floating fish farm in the sea or ocean. Particularly, the invention relates to a water shield system in a floating fish farm. The invention concerns also a system for collection of fish waste and/or food / feed waste and/or dead fish. Furthermore, the invention teaches a securing system for preventing the farmed fish from escaping into the sea or ocean during different operations with the fish or for other purposes.