Scientists have observed neon tetra fish queuing up when exiting through a narrow opening, according to a study in the journal Scientific Reports.
In the study, Aurélie Dupont, a biological physicist in the Laboratoire Interdisciplinaire de Physique at University Grenoble Alpes, and her team set up two fish tanks connected to each other by a narrow opening. The diameter of the passageway varied from 1.5 to 4 centimeters.
According to satellite data, 56 percent of the world's oceans have experienced a colour change from blue to green over the past 20 years. The changes are especially noticeable in tropical areas close to the Equator.
According to researchers, the gradual greening of our oceans indicates how climate change is affecting aquatic life.
The transition from analog to digital cameras has been a boon for photographers, granting them unlimited shots and freedom of movement. These circumstances lend themselves well to the technique of shooting sequential stills. Underwater photographer Claudio Ziraldo shares his insights and tips on taking sequential shots underwater.
Poseidon M28A dive computers are subject to this recall. They continuously calculate and provide the data that divers require. The Poseidon SE7EN Rebreather with the M28A can be used separately or together. This recall only applies to dive computers with serial numbers that begin with "M28A-". On the rear of the recalled dive computers are the serial number and two metallic wet-switches.
