Here's a few paragraphs about an interesting practice from Tsem Tulku Rinpoche's community in Malaysia:
Once a month Kecharians (kechara members) and guests will put their money together and buy fish from the slaughter market to release. This month, they again purchased 150 kgs of fish, did prayers, blew mantras on to the fish and released them into a nearby large clean lake.
It was a wonderful spiritual and family event. This is arranged under the Kechara Care Dept headed by Liaison Su Ming.
It is something I started to create awareness for the sanctity of all life.
You can see the whole post, with more photos, at Rinpoche's blog.
Some might say this is just symbolic, but I bet those fish don't feel symbolic as they swim away. In any case, it's a great reminder that liberation is a shared experience - the fish need us and we need the fish.