The most dangerous of the triggerfishes are the tropical Indo-Pacific species Pseudobalistes fuscus and Balistotoides viridescens. The dangerous thing is that it attacks when it is not even provoked. When the males (most colourful) start swimming in your direction, the best thing to do is swim away backwards kicking your fins as a … Trigger fish create nests in … They Bite Fins, Cameras and, Yes, People Scientifically known as Balistoides Viridescens , the Titan is the largest of the triggerfish species, and can grow to 30 inches in length. But lets talk about trigger fish. Ordinarily these two fishes are very shy, but females guarding a nest can become extremely aggressive. Before we get going on this list of the world’s most dangerous fish I’m going to tell you what I’m not putting on the list. The table of contents. 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. The other thing that won’t be appearing on this list are jellyfish. 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. You will want to provide a larger tank (75 gallon minimum) with plenty of hiding places to help reduce the aggressiveness that may well up inside this fish if it feels threatened. Divers should not continue to swim toward a large triggerfish that does not move away upon their approach. To add more misery is the fact that this titan triggerfish attacks at the divers’ fins and flesh and bite away carelessly. The 40 species of triggerfish are scattered throughout the world’s seas and are familiar to divers and aquarium aficionados. 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. There are many things in the sea that can be dangerous. “Ya, ya, they are dangerous,” Jesse told us with uncharacteristic gravity, stabbing at the fish ID book with an index finger. It is seen often in shallow reefs, but also to depths of 50m in most of the Indo-Pacific. And all of them look amazingly colorful … and can be amazingly aggressive. There are quite a few types of these around … “clown” triggers, “red-tooth” triggers, “titan” triggers, and so on. 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." Fish Titan (Triggerfish) Fish Titan (balistoides viridescens) or also it is called like triggerfish. The Titan Triggerfish will not always bite, but can charge with great speed at snorkellers and divers escorting them out of their territory. This triggerfish is the largest of the species with a length of up to 75 centimeters. Trigger Fish. 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