This giant triggerfish, or moustache triggerfish (Balistoides viridescens), is a large species of triggerfish found in tropical reefs. The table of contents. When we got to the liveaboard, I looked up the fish in a book, which said that, when nesting, the Titan triggerfish is the most dangerous fish in the ocean." The dangerous thing is that it attacks when it is not even provoked. “Ya, ya, they are dangerous,” Jesse told us with uncharacteristic gravity, stabbing at the fish ID book with an index finger. There are many things in the sea that can be dangerous. Some biology here. This triggerfish is the largest of the species with a length of up to 75 centimeters. When the males (most colourful) start swimming in your direction, the best thing to do is swim away backwards kicking your fins as a … The other thing that won’t be appearing on this list are jellyfish. Despite triggerfish’s benign appearance, our certifying instructor, a normally insouciant Dutchman named Jesse, warned us about them vehemently before we got in the water. Fish Titan (Triggerfish) Fish Titan (balistoides viridescens) or also it is called like triggerfish. This triggerfish is one of the more easy going of the trigger fishes but it can still become dangerous in a tank full of smaller aquarium fish and invertebrates. Trigger Fish. Ordinarily these two fishes are very shy, but females guarding a nest can become extremely aggressive. The most dangerous of the triggerfishes are the tropical Indo-Pacific species Pseudobalistes fuscus and Balistotoides viridescens. Firstly, sharks – technically they should be occupying most of the top spots but as I’ve already done a rather excellent article on the most dangerous sharks I’ve decided not to repeat myself. Found in the coral reefs of Australia and Thailand, it is considered to be a beautiful creature which must be admired but forms a distance. In addition to the obvious ones (shark, stingray, stone fish), watch out for Trigger Fish. It is quite big fish, which can be very dangerous at the moment of protection of their calf masonry. But lets talk about trigger fish. And all of them look amazingly colorful … and can be amazingly aggressive. It is seen often in shallow reefs, but also to depths of 50m in most of the Indo-Pacific. To add more misery is the fact that this titan triggerfish attacks at the divers’ fins and flesh and bite away carelessly. Divers should not continue to swim toward a large triggerfish that does not move away upon their approach. The 40 species of triggerfish are scattered throughout the world’s seas and are familiar to divers and aquarium aficionados. 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