Bigmouth buffalo
Encyclopedia
The bigmouth buffalo, Ictiobus cyprinellus, also known as the gourd head, redmouth buffalo, buffalo fish, bernard buffalo, roundhead, or brown buffalo, is a large species of the Catostomidae
or "sucker" family.
The bigmouth buffalo is a dull brownish olive color with dusky fins. Like other suckers it has a long dorsal fin
, but unlike others it has a large oblique and terminal mouth. It is the largest of the buffalo fish and reaches a length of more than 4 ft (1.2 m) and 65 lb (29.5 kg) in weight.
It is distributed from the Red River of the North
, Manitoba
, Canada
and North Dakota
, United States
to the Ohio River
and south in the Mississippi River
system to Texas
and Alabama
in the United States
. It lives in sluggish areas of large rivers and shallow lakes.
The bigmouth buffalo migrates upstream to spawn in the spring, usually April to June where it lays its eggs on plants to which they adhere. Bigmouth buffalo, unlike its close relatives the black and smallmouth buffalos, is a filter-feeder, using its very fine gill rakers to strain crustacean zooplankton from the water. It sometimes feeds near the bottom, using short up-and down movements to swirl the water and thus be able to filter from the water the plants and animals that hover near the bottom or rest lightly on it (Pflieger 1997). More than one male will assist in spawning by moving the female to the top of the water to help mix eggs and milt. Spawn is usually April–May.
The fish is vulnerable in shallow water and is often captured by spearing. It is commercially caught on trot lines, setlines, hoop and trammel nets, and seines. Though it has numerous small bones, its good flavor makes it one of the most valuable of the non-game freshwater fish.
which flows through Alberta
and the Qu'Appelle River
which flows through Saskatchewan
and Manitoba
into Lake Winnipeg
. Beginning in the northern United States they are native to Iowa, South Dakota and Minnesota, more southern states include eastern Texas and Oklahoma. The major drainages they are found in include Lake Erie, Ohio River, and Mississippi River drainages. From these drainages they are found into Arkansas, the Gulf region of Louisiana and down the Tennessee River into Alabama. The introduction of bigmouth has been largely done for commercial purposes. The regions include reservoirs within Arizona, North Dakota and Montana. The reservoirs in North Dakota and Montana are of the Missouri River drainage. Within California they have also been introduced to the aqueduct system of Los Angeles. The distribution has only increased in size so there is nothing determined to extirpate the bigmouth.
The optimum habitat for bigmouth buffalo requires highly vegetated and turbid waters. Turbidity levels of over 100 ppm are optimal, they also like muddy bottoms. A minimum total dissolved solids is 200 ppm during the growing season. During spring and summer there should be 50–75% pools, backwaters, and marsh areas and 25-75% littoral area and protected embayments during summer for the habitat to be suitable .
Bigmouth can be found in waters from 22.5–38.0°C but their preferred temperature is between 31-34°C. The optimal temperature for incubation and hatching of eggs is from 15-18°C but they can develop in temperatures reaching up to 26.7°C .
The bigmouth prefer slow-moving water that does not reach a velocity over 30 cm/sec. Salinity can be a problem for reproduction. Spawning can occur from 1.4-2.0 ppt of salinity which eggs and yearlings not being able to survive a salinity of over 9 ppt . The minimum dissolved oxygen during the spring and summer is 5 mg/l .
All of these factors in the ecology of bigmouth buffalo result in their seclusion to slow-moving vegetated/marshy areas in oxbows of rivers and reservoirs.
Catostomidae
Catostomidae is the sucker family of the order Cypriniformes. There are 80 species in this family of freshwater fishes. Catostomidae are found in North America, east central China, and eastern Siberia...
or "sucker" family.
The bigmouth buffalo is a dull brownish olive color with dusky fins. Like other suckers it has a long dorsal fin
Dorsal fin
A dorsal fin is a fin located on the backs of various unrelated marine and freshwater vertebrates, including most fishes, marine mammals , and the ichthyosaurs...
, but unlike others it has a large oblique and terminal mouth. It is the largest of the buffalo fish and reaches a length of more than 4 ft (1.2 m) and 65 lb (29.5 kg) in weight.
It is distributed from the Red River of the North
Red River of the North
The Red River is a North American river. Originating at the confluence of the Bois de Sioux and Otter Tail rivers in the United States, it flows northward through the Red River Valley and forms the border between the U.S. states of Minnesota and North Dakota before continuing into Manitoba, Canada...
, Manitoba
Manitoba
Manitoba is a Canadian prairie province with an area of . The province has over 110,000 lakes and has a largely continental climate because of its flat topography. Agriculture, mostly concentrated in the fertile southern and western parts of the province, is vital to the province's economy; other...
, Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
and North Dakota
North Dakota
North Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
, United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
to the Ohio River
Ohio River
The Ohio River is the largest tributary, by volume, of the Mississippi River. At the confluence, the Ohio is even bigger than the Mississippi and, thus, is hydrologically the main stream of the whole river system, including the Allegheny River further upstream...
and south in the Mississippi River
Mississippi River
The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...
system to Texas
Texas
Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
and Alabama
Alabama
Alabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
in the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
. It lives in sluggish areas of large rivers and shallow lakes.
The bigmouth buffalo migrates upstream to spawn in the spring, usually April to June where it lays its eggs on plants to which they adhere. Bigmouth buffalo, unlike its close relatives the black and smallmouth buffalos, is a filter-feeder, using its very fine gill rakers to strain crustacean zooplankton from the water. It sometimes feeds near the bottom, using short up-and down movements to swirl the water and thus be able to filter from the water the plants and animals that hover near the bottom or rest lightly on it (Pflieger 1997). More than one male will assist in spawning by moving the female to the top of the water to help mix eggs and milt. Spawn is usually April–May.
The fish is vulnerable in shallow water and is often captured by spearing. It is commercially caught on trot lines, setlines, hoop and trammel nets, and seines. Though it has numerous small bones, its good flavor makes it one of the most valuable of the non-game freshwater fish.
Abstract
This is a description of a monitoring plan for the bigmouth buffalo, Ictiobus cyprinellus, and a short life history of the fish and previous management done. The bigmouth buffalo is naturally found throughout the United States from the Great Lakes south to Alabama and Louisiana drainages and west to Texas and Minnesota. They generally live in shallow lakes, large slow-moving rivers or swamps since they seem to be adept at dealing with these low oxygen type habitats. This species of buffalo spawn in rock and gravel (open substratum) and have pelagic free embryos which they lay sometime in the spring . Populations of the bigmouth buffalo are currently shown as stable . The bigmouth buffalo is a popular foodfish throughout the United States and has been introduced into multiple states. There does not seem to be any considerable impact on their population that would harm their population numbers drastically in the near future. There are certain ecological needs that the bigmouth have in order to live though. They prefer shallow, slow-moving water like flooded vegetation. Bigmouth buffalo are also susceptible to anchor parasites which can lead to secondary infections which can be harmful in poor water conditions . Future management plans may need to include a treatment of major bigmouth buffalo habitats for these parasites if they become more abundant. In some areas of its distribution bigmouth buffalo may present a problem with overpopulation, there have been studies done on the effectiveness of electrical barriers in Lake Heron to decrease the population . A way to maintain the current populations or decrease them will certainly be a potential management need in the future for certain areas if cases like Lake Heron become more common.Geographic distribution
The bigmouth's native and introduced distribution is confined to the countries of Canada and the United States of America. In Canada they inhabit the Milk RiverMilk River
-Rivers:Canada and the United States*The Milk River , a tributary of the upper Fraser River in Canada*The Milk River , United States*The Milk River , a tributary of the Missouri RiverJamaica*The Milk River...
which flows through Alberta
Alberta
Alberta is a province of Canada. It had an estimated population of 3.7 million in 2010 making it the most populous of Canada's three prairie provinces...
and the Qu'Appelle River
Qu'Appelle River
The Qu'Appelle River is a Canadian river that flows 430 km east from Lake Diefenbaker in southwestern Saskatchewan to join the Assiniboine River in Manitoba, just south of Lake of the Prairies, near the village of St. Lazare....
which flows through Saskatchewan
Saskatchewan
Saskatchewan is a prairie province in Canada, which has an area of . Saskatchewan is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, and on the south by the U.S. states of Montana and North Dakota....
and Manitoba
Manitoba
Manitoba is a Canadian prairie province with an area of . The province has over 110,000 lakes and has a largely continental climate because of its flat topography. Agriculture, mostly concentrated in the fertile southern and western parts of the province, is vital to the province's economy; other...
into Lake Winnipeg
Lake Winnipeg
Lake Winnipeg is a large, lake in central North America, in the province of Manitoba, Canada, with its southern tip about north of the city of Winnipeg...
. Beginning in the northern United States they are native to Iowa, South Dakota and Minnesota, more southern states include eastern Texas and Oklahoma. The major drainages they are found in include Lake Erie, Ohio River, and Mississippi River drainages. From these drainages they are found into Arkansas, the Gulf region of Louisiana and down the Tennessee River into Alabama. The introduction of bigmouth has been largely done for commercial purposes. The regions include reservoirs within Arizona, North Dakota and Montana. The reservoirs in North Dakota and Montana are of the Missouri River drainage. Within California they have also been introduced to the aqueduct system of Los Angeles. The distribution has only increased in size so there is nothing determined to extirpate the bigmouth.
Ecology
The bigmouth buffalo has numerous ecological needs. Diet is important in any organisms' ecology. The larval bigmouth are benthic feeders of copepods and cladocerans mostly but also eat phytoplankton and chironomids . The juveniles and adults are benthic and limnetic plankton feeders that also eat cladocera, copepods, algae, Chironomidae, ostracods, and other insect larvae and invertebrates depending on availability .The optimum habitat for bigmouth buffalo requires highly vegetated and turbid waters. Turbidity levels of over 100 ppm are optimal, they also like muddy bottoms. A minimum total dissolved solids is 200 ppm during the growing season. During spring and summer there should be 50–75% pools, backwaters, and marsh areas and 25-75% littoral area and protected embayments during summer for the habitat to be suitable .
Bigmouth can be found in waters from 22.5–38.0°C but their preferred temperature is between 31-34°C. The optimal temperature for incubation and hatching of eggs is from 15-18°C but they can develop in temperatures reaching up to 26.7°C .
The bigmouth prefer slow-moving water that does not reach a velocity over 30 cm/sec. Salinity can be a problem for reproduction. Spawning can occur from 1.4-2.0 ppt of salinity which eggs and yearlings not being able to survive a salinity of over 9 ppt . The minimum dissolved oxygen during the spring and summer is 5 mg/l .
All of these factors in the ecology of bigmouth buffalo result in their seclusion to slow-moving vegetated/marshy areas in oxbows of rivers and reservoirs.