Aquatic and Marine Biology

The whale shark (Rhincodon typus) is the largest known extant fish species. Despite the name, it is a shark, not a whale.

Physalia is called 'Portuguese man of war'.

Icthyophis is a limbless amphibian.

Lamprey is a jawless vertebrate.

Hyla is a tree frog.

Except fish the rest can breathe on land also.

Prawn respires through gills.Gills usually consist of thin filaments of tissue, branches, or slender, tufted processes that have a highly folded surface to increase surface area

A swim bladder is a gas-filled organ that helps bony fish maintain buoyancy. It is absent in cartilaginous fish, which rely on other methods like large oily livers.

Bilateral symmetry means the body can be divided into two similar mirror-image halves along a central plane. This is a common feature in most fish species.

Gills are specialized respiratory organs that allow fish to absorb dissolved oxygen from the water. They are essential for gas exchange in an aquatic environment.

The gill filaments are the thin, vascularized structures attached to the gill arch. They provide a large surface area for efficient oxygen uptake.

Fish fins are categorized into paired fins (pectoral and pelvic) and median fins (dorsal, anal, and caudal). Median fins are located along the midline of the body.

Pectoral and pelvic fins are paired fins. They are used for maneuvering, braking, and maintaining balance or position in the water column.

The caudal fin is the tail fin. It is the primary source of propulsion for most fish and acts as a rudder to steer and change direction.

The swim bladder is a gas-filled organ that allows fish to control their buoyancy. By adjusting the amount of gas, they can remain at a specific depth without swimming constantly.