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The answer to this, I recon, is that they don't. They use molecular oxygen (O2) dissolved in the water for respiration, where is acts as a terminal electron acceptor, just as we use molecular oxygen in the air for respiration. We can speak of the water as being oxygenated. What is split in photosynthesis, where reducing equivalents from water are used to ...

Answer The mechanism for salmon natal homing isn't exactly known, but there are really two good hypotheses out there. Salmon have an extremely good sense of smell. One hypothesis is that they retain an imprint of their birthplace's odor, and manage to recognize it again at a later time (as explained by this article). Another hypothesis: the Earth's ...

The mechanisms of osmoregulation is different for sharks (and other elasmobranch fishes) and teleost fishes. In Elasmobranchs the body osmolarity is maintained equal to the seawater by Na⁺ Cl⁻ and urea. Toxicity because of high concentrations of urea (strong chaotrope) is counteracted by high levels of trimethylamine oxide (TMAO). So, the elasmobranchs do ...

I can't answer your third, but I can answer your first two. With one word, in fact: Bioluminescence http://brightnepenthe.blogspot.com/2010/08/palate-cleanser-90.html That's the deep ocean at night for ya. Unlike underground environments and caves, it's not pitch black pretty much anywhere in the ocean. There are things to see everywhere, and they play ...

Indeed tuna are present in the Baltic sea, and they can also grow in the Pacific and Indian oceans. A lot of the tuna we see in tuna cans in supermarkets comes from the stocks in the Indian ocean, but it is possible to have fresh tuna from the Baltic. Sorry, I only found a French answer from a famous French news paper: ...

Wikipedia has some revealing information here: Not all puffers are necessarily poisonous; Takifugu oblongus, for example, is a fugu puffer that is not poisonous, and toxin level varies wildly even in fish that are. A puffer's neurotoxin is not necessarily as toxic to other animals as it is to humans, and puffers are eaten routinely by some species of ...