This pack looks brilliant, especially the front card where it reads "Discover the fascinating world of fish, how big they grow, where they live and what they eat." Each card has its own description and the images used fit well.
Card List Of The Different Types Of Fish In The TOPTRUMPS Pack 
Atlantic Blue Marlin
Mekong Giant Catfish
Red Bellied Piranha
Sailfish Sawfish Siamese Fighting Fish Striped Sea Bass Wels Catfish Whale Shark
These are the different types of fish in the 'fish' pack of TopTrumps