Largemouth Bass

The **largemouth bass** (*Micropterus salmoides*) is a carnivorous freshwater gamefish in the Centrarchidae (sunfish) family, a species of black bass native to the eastern and central United States, southeastern Canada and northern Mexico, but widely introduced elsewhere. It is known by a variety of regional names, such as the **widemouth bass**, **bigmouth bass**, **black bass**, **bucketmouth**, **largies**, **Potter's fish**, **Florida bass**, **Florida largemouth**, **green bass**, **bucketmouth bass**, **Green trout**, **gilsdorf bass**, **Oswego bass**, **LMB**, and **southern largemouth** and **northern largemouth**. The largemouth bass is the state fish of Georgia and Mississippi, and the state freshwater fish of Florida and Alabama. The largemouth bass is an olive-green to greenish gray fish, marked by a series of dark, sometimes black, blotches forming a jagged horizontal stripe along each flank. The upper jaw (maxilla) of a largemouth bass extends beyond the rear margin of the orbit. The largemouth is the largest of the black basses, reaching a maximum recorded overall length of 29.5 in (75 cm) and a maximum unofficial weight of 25 pounds 1 ounce (11.4 kg). Sexual dimorphism is found, with the female larger than the male.  Average lifespan in the wild is 10 to 16 years. The juvenile largemouth bass consumes mostly small bait fish, scuds, water fleas, copepods, small shrimp, and insects. Adults consume smaller fish (bluegill, banded killifish, minnows), shad, worms, snails, crawfish (crayfish), frogs, snakes, salamanders, bats and even small water birds, mammals, turtle hatchlings, and alligator hatchlings. In larger lakes and reservoirs, adult bass occupy deeper water than younger fish, and shift to a diet consisting almost entirely of smaller fish like shad, yellow perch, ciscoes, suckers, shiners, other cyprinids, freshwater silversides, and sunfish. It also consumes younger members of larger fish species, such as catfish, trout, walleye, white bass, striped bass, and even smaller black bass. Prey items can be as large as 50% of the bass's body length or larger.

Studies of prey utilization by largemouths show that in weedy waters, bass grow more slowly due to difficulty in acquiring prey. Less weed cover allows bass to more easily find and catch prey, but this consists of more open-water baitfish. With little or no cover, bass can devastate the prey population and starve or be stunted. Fisheries managers must consider these factors when designing regulations for specific bodies of water. Under overhead cover, such as overhanging banks, brush, or submerged structure, such as weedbeds, points, humps, ridges, and drop-offs, the largemouth bass uses its senses of hearing, sight, vibration, and smell to attack and seize its prey. Adult largemouth are generally apex predators within their habitat, but they are preyed upon by many animals while young, including great blue herons, larger bass, northern pike, walleye, muskellunge, yellow perch, channel catfish, northern water snakes, crappie, common carp, and American eels. Multiple species of kingfishers and bitterns feed on this bass, as well. Both the young and adult largemouths are targeted by the bald eagle.

Notably in the Great Lakes Region, *Micropterus salmoides* along with many other species of native fish have been known to prey upon the invasive round goby (*Neogobius melanostomus*). Remains of said fish have been found inside the stomachs of largemouth bass consistently. This feeding habit may impact the ecosystem positively, but more research must be conducted to verify this. It is illegal to use or possess live *Neogobius melanostomus* as bait in the Great Lakes Region. Largemouth bass usually reach sexual maturity and begin spawning when they are about a year old. Spawning takes place in the spring season when the water temperature first remains continuously above 60 °F (16 °C) for a sufficient period of time.[*specify*] In the northern region of the United States and Canada, this usually occurs anywhere from late April until early July. In the southern states, where the largest and healthiest specimens typically inhabit, this process can begin in March and is usually over by June. Males form nests by moving debris from the bottom of the body of water using their tails. These nests are usually about twice the length of the males, although this can vary. Bass prefer sand, muck, or gravel bottoms, but will also use rocky and weedy bottoms where there is cover for their nest, such as roots or twigs. After finishing the nest, the males swim near the nest looking for a female to mate with. After one is found, the two bass swim around the nest together, turning their bodies so that the eggs and sperm that are being released will come in contact on the way down to the nest. Bass will usually spawn twice per spring, with some spawning three or four times, although this is not as common. The male will then guard the nest until the eggs hatch, which can take about 2 to 4 days in the southern US and Northern Mexico, and slightly longer in the northern part of its native range. Finally, depending on the water temperature, the male will stay with the nest until the infant bass are ready to swim out on their own, which can be about two more weeks after they hatch. After this, the male, female, and newborns will switch to more of a summer mode, in which they then focus more on feeding.