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The Flannelmouth Sucker (Catostomus latipinnis) is a large, robust freshwater fish belonging to the family Catostomidae. It is characterized by its large, fleshy lips, subterminal mouth, and relatively large, dark scales. This species is well-adapted to the turbulent, often silty, waters of its native river systems.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Dorsal surface typically dark olive to brownish-gray, fading to a lighter, often yellowish or silvery-white belly. Fins are usually dusky. Spawning males may develop a reddish lateral band and nuptial tubercles.
- Scale type
- cycloid
- Mouth position
- subterminal
- Distinctive features
- Large, fleshy, papillose lips with numerous folds and papillae, particularly on the lower lip, giving it a 'flannel-like' appearance., Subterminal mouth, adapted for bottom feeding., Relatively large scales for a sucker species, with 60-75 scales in the lateral line., Dorsal fin typically has 11-13 rays., Caudal peduncle is relatively deep.
- Dorsal fin
- Single dorsal fin, typically with 11-13 soft rays, positioned mid-body.
- Tail fin
- Moderately forked caudal fin.
- Pectoral fin
- Large and somewhat rounded pectoral fins, positioned low on the body.
- Distinctive fins
- Pelvic fins are abdominal, located well behind the pectoral fins. All fins are generally dusky.
Identification Tips
Mouth and Lips
Observe the large, fleshy, and highly papillose (bumpy) lips, especially the lower lip, which is deeply incised and appears 'flannel-like'. This is the most distinguishing feature.
Scales
Count the scales along the lateral line; Flannelmouth Suckers typically have 60-75 scales, which are relatively large compared to other suckers in its range.
Dorsal Fin Rays
Count the soft rays in the dorsal fin; usually 11-13, which can help differentiate it from some other sucker species.
Body Shape and Coloration
Note the elongated, robust body and the typical dark olive to brownish-gray dorsal coloration with a lighter belly.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderately deep sections of rivers, often in depths of 1-5 meters, but can be found deeper.
- Environment
- Prefers large, clear to turbid rivers and larger streams with moderate to swift currents. Commonly found over gravel, cobble, or bedrock substrates, but also utilizes sandy and silty areas. Requires access to riffles for spawning and deeper pools for overwintering.
- Geographic range
- Native to the Colorado River basin and its major tributaries in the southwestern United States, including parts of Arizona, Colorado, New Mexico, Utah, and Wyoming. Its range has been somewhat reduced due to habitat alteration and dam construction.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 500 gallons
- Temperature: 10-22°C (50-72°F)
- pH level: 7.0-8.5
- Hardness: 10-25 dGH
- Compatibility: Generally peaceful with other large, non-aggressive fish. Not suitable for typical home aquariums due to size and specific habitat requirements.
- Special requirements: Requires very large tanks with strong filtration and high oxygenation. Substrate should be sand or fine gravel. Mimic natural riverine conditions with strong currents and hiding places among rocks and driftwood. Not typically kept in home aquaria due to size and specialized needs.
Wild Information
- Conservation status: least concern
- Seasonality: Spawns in spring (typically April to June) when water temperatures rise. Active year-round, though less active in colder months.
- Market price: N/A
- Commercial importance: none
- Taste: Often described as bony and having a muddy flavor, though some find it palatable when prepared correctly.
- Texture: Flaky, but with numerous small bones.
- Cooking methods: Smoking, Frying (after scoring to break up bones), Grinding for patties
- Nutritional value: Good source of protein and omega-3 fatty acids, similar to other freshwater fish.
Key Facts
Bottom Feederbehavior
Flannelmouth Suckers are primarily benthic feeders, using their specialized mouth to scrape algae and detritus from rocks and ingest small invertebrates from the substrate.
Long-Livedinteresting
This species can live for a considerable time, with individuals documented to live over 20 years in the wild.
Ecological Roleinteresting
As a detritivore and herbivore, the Flannelmouth Sucker plays a crucial role in nutrient cycling and maintaining the health of river ecosystems by consuming algae and organic matter.
Spawning Migrationsbehavior
Adult Flannelmouth Suckers undertake significant upstream migrations to spawn in gravel riffles during the spring, often traveling long distances.
Indicator Speciesinteresting
Their presence and health can serve as an indicator of the overall ecological condition of the Colorado River system.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: Flannelmouth Suckers are harmless to handle. They can be slippery due to mucus, so a firm but gentle grip is recommended. Always wet hands before handling fish to protect their slime coat. No sharp spines or venomous glands.
Similar Species
Bluehead Sucker
Catostomus discobolus
The Bluehead Sucker has a smaller, less papillose lower lip that is not deeply incised. Its head is often bluish, especially in spawning males, and it typically has fewer lateral line scales (55-65).
White Sucker
Catostomus commersonii
The White Sucker has a smaller mouth and lips with fewer, less prominent papillae. Its scales are generally smaller and more numerous (60-80 in the lateral line), and its body is typically more slender.
Desert Sucker
Catostomus clarkii
The Desert Sucker has a smaller, more rounded head and a less robust body. Its lips are less fleshy and papillose than the Flannelmouth Sucker, and it typically has fewer lateral line scales (55-65).
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Cypriniformes
- Family
- Catostomidae
- Genus
- Catostomus
- Species
- latipinnis
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