This is essex autonomous robotic fish tested in a swimming tank. There is no motor on tail joint. The undulation motion is realized by a motor with a special mechanical linkage. The name of the fish is MT1. This video shows how the fish swim up from bottom by chaning centre of gravity.

today i added a betta (japanese fighting fish) to my tank which also has a livebearer in but the betta fish keeps chasing the livebearer with its gills wide open !
why is the betta fish doing this??
will it eat the livebearer fish??
is it trying to mate??
shall iremove the betta fish from the tank ??
i also have tetras and sucker fish in the tank but the betta keeps going after the livebearer!
please help !!! xx
thankyou -x-

Lisbon, Portugal – Oceanarium. Built for Expo ’98 as Portugal was the hosting country, this oceanarium is the largest in Europe and the second largest in the world (the largest is in Osaka, Japan). It was sooo awesome !!! The vid doesn’t do it justice. This oceanarium is HUGE!!! I saw fish I’d never even heard of never mind seen! After we shot the vid, we saw the ugliest but largest fish … the sun fish. This thing is by far the largest of the creatures in the oceanarium, and …

I need to know how much time a betta fish spends on eating, swimming, sleeping, competing and being aggressive. Also seperately with a betta fish in its nateral habitat. i need to make pie graphs from them! Thanks :)
**recorded one in the natural setting and under a person’s care.

i have a black moor, a small goldfish a large goldfish and a chinese minnow

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I know a guy who build a tank that almost never needed cleaning because it cleaned and maintained itself. He had living rocks, snails, fish, turtles and consequently never needed to clean the tank because it was biologically balanced. How do I do this and where do I get the required materials?

This is a video of my two betta fish flaring at each other. i plan on breeding them in a few months. the female is metalic green but you cant really see it that well. Im in the middle of building my “Fish room” but its in my bedroom so its limited. I’ll put it up when im done. Female- Doubletail with red fins and metalic green body Male- Delta tail cambonian with a little purple/blue at base of tail

Free range Lion fish on the reef in Fort Lauderdale. These venomous fish are an invasive species people have released from their aquariums that are destroying the native populations of fish. If you see one kill it like diver John attempts to do.

I got two betta fish about a week ago and thought I’d make a video about how to care for them and how much supplies cost. Please comment :)