River Monsters Season 8

Episode title	Episode number	Original airdate	Unhooked airdate
Deep Sea Demon	47	7 April 2016	TBA
Extreme angler & underwater detective Jeremy Wade is in search of the real creature behind the legend of the sea serpent - starting with a violent attack in the English Channel, & culminating in the depths of the Mediterranean Sea.
Death Down Under	48	14 April 2016	TBA
When six men vanish in the remote waters of northern Australia, extreme angler Jeremy Wade travels to the scene and takes on some of the deadliest animals on the planet in his search for a suspect.
Razorhead	49	21 April 2016	TBA
Something is terrorizing the Florida Keys. It's attacking both visitors and locals alike, striking its victims so violently that it is slicing open flesh, even smashing bones. Jeremy Wade is determined to identity the assailant.
Terror in Paradise	50	5 May 2016	TBA
In the West Indies, tales of swimmers being ripped from the surface of the islands' blue holes have been attributed to the Lusca - a half shark, half octopus monster. Jeremy Wade reaches new depths in this dangerous investigation.
Invisible Killers	Special	12 May 2016	TBA
Jeremy Wade has hunted down freshwater killers for 30 years, but those waters are infested with darker, deadlier creatures - parasites.
Devil of the Deep	51	26 May 2016	TBA
Angler Jeremy Wade's cases usually involve freshwater culprits, but with reports of a deep water serial killer in Mexico's Sea of Cortez, he must step out of his comfort zone and into uncharted depths in search of the red devil.

References []

https://www.animalplanet.com/tv-shows/river-monsters/