The UK has lost several fish species due to overfishing, habitat destruction, and pollution. Some of these species have already become extinct, while others are critically endangered or threatened. Reintroducing fish species can help restore the balance of ecosystems and improve the health of the aquatic environment.

Some of the fish species that need to be reintroduced in the UK include:

1. Atlantic Salmon – a migratory fish that is native to the rivers of the UK. The population of Atlantic salmon has declined significantly due to overfishing and habitat destruction. Reintroduction programs are underway to restore their populations.
2. Sturgeon – once abundant in the rivers of the UK, sturgeon populations have declined significantly due to overfishing, pollution, and habitat destruction. Reintroduction programs are underway to bring back this ancient fish to the UK’s rivers.
3. European Eel – eel populations have declined by over 90% in the past few decades due to overfishing and habitat destruction. The UK government has launched a conservation program to restore their populations.
4. Sea Trout – these fish are closely related to salmon and have also suffered from overfishing and habitat destruction. Reintroduction programs are underway to restore their populations in the UK’s rivers.
5. Arctic Char – a cold-water fish that is native to the UK’s high-altitude lakes and rivers. They have become extinct in many areas due to habitat destruction and climate change. Reintroduction programs are underway to restore their populations.
6. Twaite Shad – these fish are migratory and have suffered from overfishing and habitat destruction. Reintroduction programs are underway to restore their populations in the UK’s rivers.

Reintroducing these fish species can help restore the balance of ecosystems, improve the health of the aquatic environment, and promote sustainable fishing practices.