The largemouth bass (Micropterus nigricans) is a carnivorousfreshwaterray-finned fish in the Centrarchidae (sunfish) family, native to the eastern and central United States, southeastern Canada and northern Mexico.[4][5][3] It is known by a variety of regional names, such as the widemouth bass, bigmouth bass, black bass, bucketmouth, largie, Potter's fish, Florida bass, Florida largemouth, green bass, bucketmouth bass, green trout, Gilsdorf bass, Oswego bass, LMB, and southern largemouth and northern largemouth.[6]
The largemouth bass was first described by French naturalist Bernard Germain de Lacépède in 1802. Recent studies[which?] have concluded that the correct binomial name for the Florida bass is Labrus salmoides, while the oldest available binomial for the largemouth bass is Cuvier's Huro nigricans.[citation needed] It is the largest species of the black bass, with a maximum recorded length of 29.5 inches (75 cm) and an unofficial weight of 25 pounds 1 ounce (11.4 kg).
The largemouth bass was first formally described as Labrus salmoides in 1802 by the French naturalist Bernard Germain de Lacépède with the type locality given as the Carolinas.[12] Lacépède based his description on an illustration of a specimen collected by Louis Bosc near Charleston, South Carolina. Recent phylogenomic studies, however, place the type locality given by Lacépède as within the range of the Florida bass (M. floridanus) and outside that of the largemouth bass. This study concludes that Lacépède's name is the correct binomial for the Florida bass and that the oldest available binomial for the largemouth bass is Cuvier's Huro nigricans, which has a type locality of Lake Huron which is within the range of the largemouth bass.[13]
Description
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.[14] The upper jaw (maxilla) of a largemouth bass extends beyond the rear margin of the orbit.[15]
The largemouth bass is the largest of the black basses, reaching a maximum recorded overall length of 29.5 in (75 cm)[16] and a maximum unofficial weight of 25 lb 1 oz (11.4 kg).[16]Sexual dimorphism is found, with the female larger than the male.
Largemouth bass prefer habitats with abundant littoralvegetation and generally maintain relatively small home ranges in lakes.[17] They have an average lifespan of 10 to 16 years in the wild.[18]
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,[23] including great blue herons, larger bass, northern pike, walleye, muskellunge, yellow perch, channel catfish, northern water snakes, crappie, common carp, and American eels.[21] Multiple species of kingfishers and bitterns feed on this bass, as well. Both the young and adult largemouths are targeted by the bald eagle.[21]
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.[24]
Spawning
Largemouth bass usually reach sexual maturity and begin spawning when they are about a year old.[25] 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.[26] 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.[25] 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.[27] 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 two to four 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.[25]
Largemouth bass are keenly sought after by anglers and are noted for the excitement of their 'fight', meaning how vigorously the fish resists being hauled into the boat or onto shore after being hooked. The fish will often become airborne in their effort to throw the hook, but many say that their cousin species, the smallmouth bass, is even more aggressive.[28] Anglers most often fish for largemouth bass with lures such as Spinnerbait, plastic worms (and other plastic baits), jigs, crankbaits, and live bait, such as worms and minnows. A recent trend is the use of large swimbaits to target trophy bass that often forage on juvenile rainbow trout in California. Fly fishing for largemouth bass may be done using both topwater and worm imitations tied with natural or synthetic materials. Other live baits, such as frogs or crawfish, can also be productive. Large golden shiners are a popular live bait used to catch trophy bass, especially when they are sluggish in the heat of summer or in the cold of winter.[29] Largemouth bass usually hang around big patches of weeds and other shallow water cover. These fish are very capable of surviving in a wide variety of climates and waters. They are perhaps one of the world's most tolerant freshwater fish.[citation needed]
The world record largemouth according to the IGFA is shared by Manabu Kurita and George W. Perry. Kurita's bass was caught from Lake Biwa in Japan on July 2, 2009, and weighed 10.12 kilograms (22 lb 5 oz) Perry's bass was caught on June 2, 1932, from Montgomery Lake in Georgia and weighed 10.09 kilograms (22 lb 4 oz). This record is shared because the IGFA states a new record must beat the old record by at least 2 ounces.[30]
Strong cultural pressure among largemouth bass anglers encourages the practice of catch and release, especially the larger specimens, mainly because larger specimens are usually breeding females that contribute heavily to future sport fishing stocks. Largemouth bass respond well to catch and release, with a very high survival rate after release, especially if the fish is handled with care and is loosely hooked in the side or top of the mouth.[citation needed] However, if the fish swallows the hook, survival odds greatly decrease. [citation needed] Largemouth bass have a white, slightly mushy meat, lower quality than that of the smallmouth bass, bluegill, yellow perch, crappie or walleye. Small largemouth, of 10–14 inches, can contain higher quality meat, especially during the spring.[citation needed]
Given largemouth bass' prevalence across North America and their accessibility to the everyday angler, largemouth bass are often viewed as an introductory fish. Fishing for largemouth bass can help beginner anglers transition away from traditional "worm on a hook" angling towards fishing with artificial lures and strategies. It is often the case that recreational fishermen become "addicted to fishing" shortly after they make largemouth bass their target species. [citation needed] The cultural implications of largemouth bass are quite significant, as there are even competitions and tournaments specifically targeting largemouth bass in North America.
Invasive species
The largemouth bass has been introduced into many other regions and countries due to its popularity as a sport fish and tolerance to urban environments. It causes the decline, displacement or extinctions of species in its new habitat through predation and competition,[31] for example in Namibia. They are also an invasive species in the Canadian province of New Brunswick, and are on the watch list across much of the far northern US and Canada. In colder waters, these fish are often a danger to native fish fry such as salmon and trout.[32] They have also been blamed for the extinction of the Atitlan grebe, a large waterbird which once inhabited Lake Atitlan, Guatemala.[33] In 2011, researchers found that in streams and rivers in the Iberian Peninsula, juvenile largemouth bass were able to demonstrate trophic plasticity, meaning that they were able to adjust their feeding habits to obtain the necessary amount of energy needed to survive. This allows them to be successful as an invasive species in relatively stable aquatic food webs.[34] Similarly, a study done in Japan showed that the introduction of both largemouth bass and bluegill into farm ponds have caused increases in the numbers of benthic organisms, resulting from the predation on fishes, crustaceans, and nymphal odonates by the bass.[35] The largemouth bass has been causing sharp decreases in native fish populations in Japan since 1996, especially in bitterling fish in Lake Izunuma-Uchinuma.[36]
Conservation
To better understand the effects of angling on largemouth bass populations, researchers have studied physiological variation in the largemouth bass. One study found that in areas where angling was high, there was a significant effect on bass physiology. In stress tests, bass from protected areas had increased cortisol responsiveness compared to those in the highly active fisheries.[37] The largemouth bass in Freshwater Protected Areas also had a higher aerobic scope, potentially providing them with more energy for growth, reproduction, and responding to environmental change.[37] Another study found that maternal exposure to the stress hormone cortisol resulted in a lower responsiveness to angling stressors in their progeny.[38] These studies in tandem provide evidence that repeated exposure to stress hormones and high angling pressure can bring out suboptimal phenotypes in largemouth bass populations.
^"State Freshwater Fish", Florida State Symbols, Florida Department of State, retrieved May 8, 2019
^"Official Alabama Fresh Water Fish". Official Symbols and Emblems of Alabama. Alabama Department of Archives and History. November 17, 2003. Retrieved May 7, 2019.
^Redfern, Julia (October 15, 2017). "Effects of maternal cortisol treatment on offspring size, responses to stress, and anxiety-related behavior in wild largemouth bass (Micropterus salmoides)". Physiology and Behavior. 180: 15–24. doi:10.1016/j.physbeh.2017.08.001. PMID28782525. S2CID38768461.
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