Eastern Pickerel

Eastern Pickerel

Esox niger

Size
to 39"

Eastern or 'Chain' pickerels are deep olive-green on the back, shading to a creamy yellow on the belly. Olive green blotches are present within distinct black chain-like or interwoven markings on the sides. There is a distinct dark, vertical bar below the eye. The cheek and gill covers are completely covered by scales. The underside of the lower jaw has 14-17 branchiostegal rays. There are no recognized subspecies. However, they hybridize readily with redfin pickerels. They are distantly related to trout and salmon.

Chain Pickerels are normally found in vegetated lakes, swamps and backwaters, and small to large rivers. They prefer water temperatures from 75 to 80°F.

Chain pickerels are random spawners rather than nest builders. Spawning occurs in late winter to spring among heavy aquatic weed growth or flooded grasses, in water from a few inches deep to several feet deep. A large number of adhesive eggs are scattered over vegetation. No nest is constructed and no parental care is given to the eggs or fry. About three to four weeks after hatching, they begin cannibalizing other fry.

Pickerels are lie-in-wait predators: they hide in the weeds and lunge out at small passing fishes. The chain pickerel's diet is mainly fish. They also eat insects, frogs, mice, crayfish, and a wide variety of other foods.

Sexes are similar. Sexual maturity is reached in the first to fourth year, and the maximum life span is probably eight to nine years. Females grow faster than males. In Florida, chain pickerels can reach lengths of up to 30 inches long.

Chain Pickerel
Mudminnow

It's hard to believe that the little Mudminnow ( 4" ) is cousin to the Pickerel, but it is. Look at the layout of the fins. At the other end of the spectrum, the Muskellunge grows to six feet or more.


Human Vision Underwater

When light travels from a less-dense medium like air to a more-dense medium like water, the rays are refracted or bent towards the normal or perpendicular of the surface between the two mediums. In crude terms, light going from air to water will tend to be straightened, while light going from water to air will tend to be ... um ... crookeded. Confused yet? Take a look at the figure below.

refraction
( Tautogolabrus adspesus )

In this figure, you can see the light rays traveling from an object in the water to your eyes, neglecting the effect of the flat glass lens of your mask. The blue lines trace the actual path of the light rays through the water and into the air, or conversely, through the air into the water - the direction really doesn't matter. As you can see, the rays are bent toward the perpendicular of the surface on the water side, and away from it on the air side.