'Island of The Fishmen' (1979) – Sergio Martino.

Menacingly marooned upon this desolated isle of multitudinous madness, malevolently manhandled by increasingly malign mermen, and tormented by a tyrannical toffee nosed toff (Richard Johnson), these ragged, starveling, long-suffering sailors fatefully discover that its gill or be killed in genre maestro, Sergio Martino's small scale, sinisterly subaquatic shocker 'Island of The Fishmen'. Luridly Lovecraftian, and teasingly exotic, this unfathomably fabulous, successfully genre-bending 70s creature feature is certain to get its hooks deep into you long before the final reel! 

Handsomely shot, with an engagingly boy's own text, beloved Euro-cult icons, Richard Johnson, Claudio Cassinelli, and the exquisitely beautiful Barbara Bach provide the weighty dramatic ballast that keeps this far from waterlogged, frequently fin-tastic Italian fright-flick afloat! No mere B-Movie minnow, this leviathan of diabolical dentistry proves to be kinkier than Jules Verne, delves deeper into twisted animalistic terror than H.G. Wells, and delivers more shocks than a startled stingray! Long neglected, Sergio Martino's far-flung fright-fest now sparkles on remastered HD, revealing a dazzlingly toothsome treasure chest of tantalizing terror for future horror fans to discover! Not only is Martino's rip roaring, high seas adventure enormously fun to watch, the sinfully scrumptious, brine-soaked Barbara Bach is quite ravishing to behold, and the beguilingly boggle-eyed mermen make for uncommonly striking protagonists.

'No merman is an island!' - Weirdlingwolf.