The dorsal fin is small, visible only briefly during the dive sequence.

Spotted Dolphin The pectoral fin and dorsal fin of the dolphin contribute to its agility and speed in the water.

The pectoral fins are movable and used in maneuvering ; the dorsal fin is fixed and contributes stability, and the tail is used for propulsion, as well as maneuvering.

Swimming water animals such as fish and cetaceans actively use pectoral fins for maneuvering, and dorsal fins contribute stability as the animal swims, propelling and maneuvering with its tail, itself recognizable as a fin.

The gray whale also lacks a dorsal fin, instead bearing 6 to 12 dorsal crenulations (" knuckles "), which are raised bumps on the midline of its rear quarter, leading to the flukes.

Female residents characteristically have rounded dorsal fin tips that terminate in a sharp corner.

The gray or white area around the dorsal fin, known as the " saddle patch ", often contains some black colouring in residents.

Offshores appear to be smaller than the others, and females are characterized by dorsal fin tips that are continuously rounded.

Most of the dark parts of its body are medium gray instead of black, although it has a dark gray patch called a " dorsal cape " stretching back from its forehead to just behind its dorsal fin.

It is immediately recognizable by its extremely small white eye patch, shorter than usual dorsal fin, and bulbous head ( similar to a pilot whale ).

alt = Killer whale with only top of back and dorsal fin visible above water surface, the dorsal fin curves backward at the tip.

It has a heavy and robust body with a large dorsal fin up to tall.

At about the male's dorsal fin is more than twice the size of the female's and is more of a triangular shape — a tall, elongated isosceles triangle — whereas hers is shorter and more curved.

An individual killer whale can often be identified from its dorsal fin and saddle patch.

Variations such as nicks, scratches, and tears on the dorsal fin and the pattern of white or grey in the saddle patch are unique.

alt = Back and dorsal fin of killer whale projecting above the sea surface, including the grey saddle patch and part of the white eye patch: The dorsal fin rises steeply to a rounded point.

In aquatic salamanders and in frog tadpoles, the tail has dorsal and ventral fins and is moved from side to side as a means of propulsion.

At hatching, a typical salamander larva has eyes without lids, teeth in both upper and lower jaws, three pairs of feathery external gills and a long, somewhat laterally flattened body and tail with dorsal and ventral fins.

The back has tawny-colored underfur and long, black-tipped guard hairs that form a black dorsal stripe and a dark cross on the shoulder area.

The black-tipped tail has a scent gland located on its dorsal base.

The most common type ( referred to above ) has a row of scales beginning at the front of the dorsal fin and ending at the end of the dorsal fin ( along both sides of the fin ).

Accumulating evidence, primarily from neuroimaging but also neuropsychological investigations, has implicated the dorsal striatum in different aspects of motivational and learning processes that support goal-directed action.

It has a number of lateral projections that look like dorsal fins, but turned the incorrect way.

It has a long neck with a turtle-like head and a long continuous dorsal fin.

Studies in patients that were a subject to bilateral cingulotomy, that involved fMRI analyses, showed that the anterior cingulate cortex has a key role in cognitive control and is highly likely to be involved in the control of attentional response, whereas the dorsal part of that region of the brain was not identified to be involved in such a process, although this is still under dispute.

It has large, rough scales and two dorsal fins.

It has sharp dorsal spines.

The springbok also has a pouch of white, brushlike hairs running along its back, which opens up when the animal senses danger, causing the dorsal hairs to stand on end.

The anal fin usually has two spines while the dorsal fins are deeply notched or separate.

The dorsal hippocampal formation also has more place field neurons than both the ventral and intermediate hippocampal formation ( Jung et al., 1994 ).

The intermediate hippocampus has overlapping characteristics with both the ventral and dorsal hippocampus ( Fanselow & Dong, 2009 ).

Furthermore, the ventral hippocampus has less place field neurons than the dorsal hippocampus but more place field neurons than the intermediate hippocampus.

Like all modern sirenians, the dugong has a fusiform body with no dorsal fin or hind limbs, instead possessing paddle-like forelimbs used to manoeuvre.

Gigantactis is a deep-sea fish with a dorsal fin whose first filament has become very long and is tipped with a bioluminescent photophore lure.

Cenoceras is evolute to involute, and globular to lentincular ; with a suture that generally has a shallow ventral and lateral lobe and a siphuncle that is variable in position but never extremely ventral or dorsal.

In spastic CP, selective dorsal rhizotomy has also been used to decrease muscle overactivity.

This fish-like animal has many similarities to Y. lividum, but also differs in several aspects: it has a discernible heart, dorsal and ventral aorta, gill filaments, and a notochord ( neural chord ).

There are 13 – 15 soft rays in the dorsal fin.

Sciaenids have a long dorsal fin reaching nearly to the tail, and a notch between the rays and spines of the dorsal, although the two parts are actually separate.

The dorsal and anal fin also contain basal cartilages, not just fin rays.

The pike have a very typical hunting behavior ; they are able to remain stationary in the water by moving the last fin rays of the dorsal fins and the breast fins.

* Compared to a tautog or cunner, its mouth is much larger, also the caudal fin, pectoral fin, and soft portion ( 11 rays ) of dorsal fin as long as spiny portion.

Each of the dorsal finlets have bifid ( doubleedged ) tips, and are the only fins with spines, the rest of the fins being composed of soft rays.

The most distinctive characteristic of the bowfin is its very long dorsal fin consisting of 145 to 250 rays, and running from mid-back to the base of the tail.

The dorsal fin will have 11 to 17 spines, often long and separated from each other, and the pectoral fins will be well-developed, with 11 to 25 rays.

The dorsal fin is deeply notched between the 10 spines and the 9-13 soft rays.

The dorsal and the anal fins have soft rays and are long based, while the pectoral and ventral fins are small.

The dorsal spines are 8 to 10 in number, and well forward of the rays of the dorsal fin.

) The dorsal fin has 8 – 21 spines and 6 – 21 soft rays, usually running most of the length of the back.

The second common name highlights the fact that its first dorsal fin is made up of long filamentous rays.

Electric rays have a rounded pectoral disc with two moderately large rounded-angular ( not pointed or hooked ) dorsal fins ( reduced in some narkids ), and a stout, muscular tail with a well-developed caudal fin.

Their two dorsal fins are widely separated with the anterior fin having five spines, the posterior fin having one spine and nine soft rays.

There are two separate dorsal fins ; the first is smaller with spines, while the second has from 15 to 25 soft rays.

Pelvic fins have 5-10 soft rays and possibly a spine, 5-10 dorsal fin spines and up to 4 anal fin spines.

Stockier than the average blenny, labrisomids are elongate nonetheless ; their dorsal fin spines outnumber soft rays ( which may be absent altogether ), and the pelvic fins are long and slender.

This silvery minnow gets its name from the sharp spiny rays in its dorsal fin.

The single dorsal and ventral fins have spines and soft rays ; the paired pectoral and pelvic fins have soft rays only ; and the caudal fin has soft rays and is truncate and rounded.