There were 7 episodes in the first season and there are 7 in this season.
There was also the extended 2 hour Goonch Episode last season after the season ended. I am guessing whichever episode was most popular this season may get rebroadcast with more footage as well... But then it again it may not, we'll see...
Taken from the Wiki, which I have posted 2 or 3 times in this thread that no one is reading.
Season↓ Episode↓ Air Date↓ Episode Title Animals
1 1 2009-04-05 Piranha Piranha, Amazon River Dolphin, Payara, Armoured catfish
1 2 2009-04-12 Killer Catfish Goonch catfish, Mugger Crocodile
1 3 2009-04-19 Alligator gar Alligator gar, American Alligator
1 4 2009-04-26 European Maneater Wels catfish
1 5 2009-05-03 Amazon Assassins Arapaima
1 6 2009-05-10 Amazon Flesheaters Piraíba catfish, Jaú catfish, Redtail catfish, Candiru, Candiru-Acù, Payara
1 7 2009-05-17 Freshwater Shark Bull shark, Queensland grouper
2 1 2010-03-28 Demon Fish Goliath tigerfish
2 2 2010-04-25 Death Ray Giant freshwater stingray, Mekong giant catfish
2 3 2010-05-02 Killer Snakehead Giant snakehead, Bullseye snakehead, Silver carp
2 4 2010-05-09 Congo Killer Kamba catfish, Vundu catfish, African lungfishes
2 5 2010-05-16 Alaskan Horror White sturgeon, Northern pike, Sockeye salmon
2 6 2010-05-23 Rift Valley Killer Nile Perch, Nile catfish
2 7 2010-05-30 Hidden Predator Bull Shark