Seahorses belong to a class of bony fish, Actinopterygii, which also includes tuna and salmon. Scientists have identified at least 47 different seahorse species, and more are likely to be added as research continues. More » Pets & Animals Marine Life

Seahorses vary widely in size and weight with most falling between 3 and 25 grams. Several dozen species of seahorse populate nearly all of the world's oceans, and they range in size from under half an inch to over a foo... More » Science Biology Zoology

Seahorses are endangered because they have relatively low birth rates, exist in small population pockets and face threats from humans through habitat alteration, fishing and exploitation. Seahorses face risks from direct... More »

There are several predators of the seahorse, including the crab, stingray, tuna and penguin. Seahorses do not have a natural defense mechanism and they do not swim very well — two factors that leave them open to predatio... More »

Animals in the Chondrichthye class are known as cartilaginous fish because their flexible skeletons are largely made of fibrous cartilage tissue, instead of bone. As vertebrates, many chondrichthyans have bony spinal col... More »

A seahorse has a small, bony body, which is closely related to that of the pipefish. The most noticeable feature of a seahorse is its head, which strikes a resemblance to the long face of a horse, as described by HowStuf... More »

Fish that are high in omega-3 fatty acids are fatty, coldwater fish such as salmon, tuna, black cod, tilefish, halibut, swordfish, mackerel, anchovies, sardines, trout and herring. Omega-3 fatty acids are polyunsaturated... More »