Freshwater is a vital and scarce resource on our planet with only 3% of the water on Earth being freshwater rivers and lakes, the rest being oceans. Freshwater rivers and lakes are formed when hollows are made in the Earth, such as when land collapses after a magma flow allowing for rainwater or melted snow to flow through and accumulate in the empty space. However, even though freshwater biomes are not expansive, they are still home to over 100,000 different species of plants and animals. Many amphibian species, such as turtles, frogs, and alligators, live in freshwater biomes. Mammals, such as otters and beavers, live in freshwater biomes too, with many more mammals stopping by a river or lake for a drink.

How are freshwater animals adapted to their environment?

Freshwater animals adapt to their environment through gills that obtain oxygen and allow them to live in rivers and streams in which the water is cooler and has a higher oxygen level. Freshwater animals also need to swim fast to catch food and utilize their environment to create their home.

Why are freshwater animals going extinct?

Freshwater animals are going extinct due to the creation of man-made elements that block migration routes for fish and disrupt habitats. The water withdrawal for human use also shrinks and degrades habitats as well as the draining of wetlands for development depletes habitats. Other reasons include overexploitation, pollution, and global warming.

How can we protect freshwater fish?

We can protect freshwater fish by establishing multiple solutions. These solutions include restricting the construction of dams and establishing protected wetlands. Other solutions to protect freshwater fish are regulating water withdrawal for human use and incentive for farming businesses to reduce the use of pesticides.

Freshwater Animals Guides
Browse through our curated Freshwater Animals Guides for additional categorizations, tips, details, variations, styles, and histories of Freshwater Animals. Guides provide additional insights into the unique properties and shared relationships between elements.
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7”-9” | 17.8-22.9 cm
5’-6.5’ | 1.5-2 m
50-125 lb | 22.7-56.7 kg
20-50 years
Alligator Gar
22.900
200.000
56.700
50.00
72000
3D
Alligator Gar
14”-19” | 37-48 cm
22”-29” | 56-74 cm
6.5’-8.5’ | 1.98-2.59 m
331-408 lb | 150-185 kg
25-30 years
Amazon River Dolphin
48.000
74.000
259.000
185.000
30.00
32200
3D
Amazon River Dolphin
1.6’-2’ | 50-62 cm
2.1’-2.7’ | 63-83 cm
8’-10’ | 2.4-3 m
573-1,058 lb | 260-480 kg
15-30 years
Amazonian Manatee
62.000
83.000
300.000
480.000
30.00
3900
3D
Amazonian Manatee
1.2”-2.4” | 3-6 cm
20”-40” | 51-102 cm
13-17 lb | 6-7.7 kg
15-40 years
American Eel
6.000
102.000
7.700
40.00
10000
3D
American Eel
8.5”-11.5” | 21.6-29.2 cm
5’-7’ | 1.52-2.13 m
60-200 lb | 27-91 kg
20-30 years
American Paddlefish
29.200
213.000
91.000
30.00
21000
3D
American Paddlefish
5”-6.75” | 12.7-17.1 cm
19”-24” | 48-61 cm
3-8 lb | 1.4-3.6 kg
6-10 years
American Shad
17.100
61.000
3.600
10.00
4500
3D
American Shad
1.2”-3.1” | 3-8 cm; 5.1” | 13 cm (Max)
6”-16” | 15-41 cm; 24” | 61 cm (Max)
.44-6 lb | .2-2.7 kg
3-6 years
Apache Trout
8.000
41.000
2.700
6.00
3460
3D
Apache Trout
2.5”-4” | 6.4-10.2 cm
12”-20” | 30.5-51 cm
2-4 lb | .9-1.8 kg
5-10 years
Arctic Grayling
10.200
51.000
1.800
10.00
3500
3D
Arctic Grayling
6.5”-9” | 16.5-22.9 cm
28”-40” | 71-102 cm
8-12 lb | 3.6-5.4 kg
5-13 years
Atlantic Salmon
22.900
102.000
5.400
13.00
13000
3D
Atlantic Salmon
12”-18” | 30.5-46 cm
11.4”-17.7” | 29-45 cm (Disc)
6.6-13.2 lb | 3-6 kg
8-10 years
Atlantic Stingray
46.000
45.000
6.000
10.00
1705
3D
Atlantic Stingray
10.2”-13.8” | 26-35 cm; 26” | 66 cm (Max)
6’-8’ | 1.83-2.44 m; 15’ | 4.57 m (Max)
198-794 lb | 90-360 kg
30-60 years
Atlantic Sturgeon
35.000
244.000
360.000
60.00
4340
3D
Atlantic Sturgeon
Baiji
19800
11”-20” | 27-52 cm
13”-24” | 32-61 cm
4.5’-8.5’ | 1.37-2.59 m
287-375 lb | 130-170 kg
24-30 years
Baiji
52.000
61.000
259.000
170.000
30.00
19800
3D
Baiji
8.3”-18.9” | 21-48 cm; 41” | 104 cm (Max)
4.7’-10.75’ | 1.42-3.28 m; 24’ | 7.32 m (Max)
573-3,307 lb | 260-1,500 kg
50-118 years
Beluga Sturgeon
48.000
328.000
1500.000
118.00
29800
3D
Beluga Sturgeon
1.5”-3.75” | 3.8-9.5 cm
4”-11” | 10-28 cm
3-4 lb | 1.4-1.8 kg
7-15 years
Black Crappie
9.500
28.000
1.800
15.00
6800
3D
Black Crappie
1.8”-3” | 4.5-7.5 cm
9”-14.6” | 23-37 cm
.4-.5 lb | .18-.2 kg
9-11 years
Bloater
7.500
37.000
0.200
11.00
3800
3D
Bloater
2.6”-3.9” | 6.5-10 cm
11”-16” | 28-41 cm
.5-.6 lb | .2-.3 kg
6-8 years
Blueback Herring
10.000
41.000
0.300
8.00
2240
3D
Blueback Herring
3”-6.5” | 7.6-16.5 cm
7”-16” | 18-41 cm
1-2.6 lb | .5-1.2 kg
5-10 years
Bluegill
16.500
41.000
1.200
10.00
33000
3D
Bluegill
2”-5.5” | 5-14 cm
10”-26” | 25-66 cm
.6-6.6 lb | .3-3 kg
5-15 years
Brook Trout
14.000
66.000
3.000
15.00
24000
3D
Brook Trout
5”-7” | 12.7-17.8 cm
24”-34” | 61-86 cm
3-9 lb | 1.4-4 kg
5-12 years
Bull Trout
17.800
86.000
4.000
12.00
5600
3D
Bull Trout
2”-4.5” | 5-11.4 cm
12”-24” | 30.5-61 cm
2-7 lb | .9-3.2 kg
15-25 years
Channel Catfish
11.400
61.000
3.200
25.00
19000
3D
Channel Catfish
5.5”-8.5” | 14-21.6 cm
24”-36” | 61-91 cm
30-40 lb | 13.6-18.1 kg
5-9 years
Chinook Salmon
21.600
91.000
18.100
9.00
17000
3D
Chinook Salmon
6”-10” | 15.2-25.4 cm
24”-40” | 61-102 cm
8-22 lb | 3.6-10 kg
3-7 years
Chum Salmon
25.400
102.000
10.000
7.00
6200
3D
Chum Salmon
4.5”-7.5” | 11.4-19 cm
18”-30” | 46-76 cm
8-35 lb | 3.6-16 kg
2-4 years
Coho Salmon
19.000
76.000
16.000
4.00
20000
3D
Coho Salmon
3.7”-5.9” | 9.5-15 cm; 11.4” | 29 cm (Max)
2’-3’ | 61-91 cm; 6’ | 183 cm (Max)
40-79 lb | 18-36 kg
40-50 years
Colorado Pikeminnow
15.000
91.000
36.000
50.00
1200
3D
Colorado Pikeminnow
.2”-.3” | .5-.75 cm
.8”-1.2” | 2-3 cm
.14-.21 oz | 4-6 g
6-12 months
Devil’s Hole Pupfish
0.750
3.000
0.006
1.00
12700
3D
Devil’s Hole Pupfish
1.6”-2.75” | 4-7 cm
24”-39” | 61-99 cm
3-8 lb | 1.4-3.6 kg
15-20 years
European Eel
7.000
99.000
3.600
20.00
9500
3D
European Eel
6.25’-8’ | 1.91-2.44 m
6.6’-8.5’ | 2-2.6 m (Disc)
794-1,323 lb | 360-600 kg
5-10 years
Giant Freshwater Stingray
244.000
260.000
600.000
10.00
2620
3D
Giant Freshwater Stingray
3.5”-5.1” | 9-13 cm
59”-79” | 1.5-2 m
44-62 lb | 20-28 kg
20-40 years
Giant Mottled Eel
13.000
200.000
28.000
40.00
1050
3D
Giant Mottled Eel
54.0"-78.0" (4’6"-6'6") | 1.4-2 m
114.0"-168.0" (9’6"-14’) | 2.9-4.3 m
3,100-8,800 lb | 1,500-4,000 kg
40-50 years
Hippopotamus
200.000
430.000
4000.000
50.00
84000
3D
Hippopotamus
3.1”-4.1” | 8-10.5 cm
15”-19” | 38-48 cm
1.5-2.5 lb | .7-1.1 kg
20-40 years
Humpback Chub
10.500
48.000
1.100
40.00
1550
3D
Humpback Chub
16”-19” | 42-49 cm
19”-22” | 48-56 cm
7’-8.17’ | 2.13-2.49 m
154-243 lb | 70-110 kg
18-26 years
Indus River Dolphin
49.000
56.000
249.000
110.000
26.00
4500
3D
Indus River Dolphin
3.1”-4.7” | 8-12 cm
39”-51” | 99-130 cm
6.6-8.8 lb | 3-4 kg
15-20 years
Japanese Eel
12.000
130.000
4.000
20.00
7800
3D
Japanese Eel
1.8”-4.9” | 4.5-12.5 cm
8”-22” | 20-56 cm
5-10 lb | 2.3-4.5 kg
5-14 years
Lahontan Cutthroat Trout
12.500
56.000
4.500
14.00
2260
3D
Lahontan Cutthroat Trout
5.5”-11” | 14-28 cm
36”-72” | 91-183 cm
30-100 lb | 13.6-45.4 kg
55-150 years
Lake Sturgeon
28.000
183.000
45.400
150.00
7300
3D
Lake Sturgeon
4”-7” | 10.2-17.8 cm
20”-36” | 51-91 cm
4-22 lb | 1.8-10 kg
10-40 years
Lake Trout
17.800
91.000
10.000
40.00
14000
3D
Lake Trout
4”-8” | 10.2-20.3 cm
15”-30” | 38-76 cm
1.8-30 lb | .8-13.6 kg
15-20 years
Largemouth Bass
20.300
76.000
13.600
20.00
42000
3D
Largemouth Bass
3.5”-6.5” | 8.9-16.5 cm
28”-48” | 71-122 cm
10-40 lb | 4.5-18.1 kg
15-30 years
Muskellunge
16.500
122.000
18.100
30.00
10000
3D
Muskellunge
Muskrat
106000
4.5”-6.7” | 11.5-17 cm
10”-15” | 25-38 cm
1.5-4.5 lb | .7-2 kg
2-4 years (wild); up to 10 years (captivity)
Muskrat
17.000
38.000
2.000
10.00
106000
3D
Muskrat
14.2”-16.9” | 36-43 cm
29”-35” | 74-89 cm
25-75 lb | 11.3-34 kg
10-15 years (wild); 15-25 years (captivity)
North American Beaver
43.000
89.000
34.000
25.00
3500
3D
North American Beaver
2.25”-3.75” | 5.7-9.5 cm
16”-26” | 41-66 cm
1.5-4 lb | .7-1.8 kg
10-25 years
Northern Pike
9.500
66.000
1.800
25.00
30000
3D
Northern Pike
3.5”-7.1” | 9-18 cm
30”-60” | 76-152 cm
80-100 lb | 36-45 kg
40-70 years
Pallid Sturgeon
18.000
152.000
45.000
70.00
1620
3D
Pallid Sturgeon
4.5”-7” | 11.4-17.8 cm
20”-30” | 51-76 cm
2-8 lb | .9-3.6 kg
4-11 years
Rainbow Trout
17.800
76.000
3.600
11.00
19000
3D
Rainbow Trout
3.5”-7.1” | 9-18 cm
1.6’-3’ | 48-91 cm
6.6-13.2 lb | 3-6 kg
35-50 years
Razorback Sucker
18.000
91.000
6.000
50.00
840
3D
Razorback Sucker
14’-23’ | 4.25-7 m (Male); 7.5’-11’ | 2.30-3.35 m (Female)
880-2200 lb | 400-1000 kg (Male); 180-220 lb | 82-100 kg (Female)
70-100 (wild); 100-120 (captivity)
Saltwater Crocodile
700.000
1000.000
120.00
31000
3D
Saltwater Crocodile
2.4”-3.1” | 6-8 cm
11.5’-13.1’ | 3.5-4 m
29-60 lb | 13-27 kg
10-40 years
Slender Giant Moray
8.000
400.000
27.000
40.00
90
3D
Slender Giant Moray
2.5”-6.5” | 6.4-16.5 cm
10”-27” | 25-69 cm
.8-12 lb | .4-5.4 kg
5-15 years
Smallmouth Bass
16.500
69.000
5.400
15.00
26000
3D
Smallmouth Bass
5.5”-15.5” | 14-39.4 cm
20”-55” | 51-140 cm
5-70 lb | 2.3-32 kg
20-30 years
Striped Bass
39.400
140.000
32.000
30.00
32000
3D
Striped Bass
Walleye
58000
4.5”-8.5” | 11.4-21.6 cm
22”-42” | 56-107 cm
3-7 lb | 1.4-3.2 kg
15-25 years
Walleye
21.600
107.000
3.200
25.00
58000
3D
Walleye
2.1’-2.8’ | 65-85 cm
2.8’-3.6’ | 85-110 cm
10’-13’ | 3-4 m
794-1,653 lb | 360-750 kg
20-30 years
West African Manatee
85.000
110.000
400.000
750.000
30.00
260
3D
West African Manatee
2.3’-3.5’ | 70-107 cm
2.8’-4.3’ | 85-130 cm
10’-14.75’ | 3-4.5 m
794-1,190 lb | 360-540 kg
25-30 years
West Indian Manatee
107.000
130.000
450.000
540.000
30.00
5200
3D
West Indian Manatee
1.6”-2.4” | 4-6 cm; 3.5” | 9 cm (Max)
8”-12” | 20-30 cm; 18” | 46 cm (Max)
2-3.3 lb | .9-1.5 kg
6-8 years
Westslope Cutthroat Trout
6.000
30.000
1.500
8.00
1505
3D
Westslope Cutthroat Trout
2.5”-5.5” | 6.4-14 cm
10”-18” | 25-46 cm
2-5 lb | .9-2.3 kg
4-9 years
White Bass
14.000
46.000
2.300
9.00
15000
3D
White Bass
1”-2.5” | 2.5-6.4 cm
4”-10” | 10-25 cm
.5-1 lb | .2-.5 kg
7-13 years
Yellow Perch
6.400
25.000
0.500
13.00
12000
3D
Yellow Perch
Lahontan Cutthroat Trout (Oncorhynchus clarkii henshawi)
Dimensioned comparison drawing of the Lahontan Cutthroat Trout compared to an average person and other freshwater fish

The Lahontan Cutthroat Trout (Oncorhynchus clarkii henshawi) is endemic to Lake Lahontan in northern Nevada. It prefers the slow, meandering cool waters in lakes, rivers, and streams. You can recognize it by the black spots evenly distributed on its body, which may be green, red, or silver. It has a trout shape and between the tail fin and dorsal fin is a small adipose fin. The dorsal fin, on the other hand, is positioned behind the middle of the back. Males are more colored than females, and during spawning, the fish show bright red colors on the gill cover and under the jaw.

Lahontan Cutthroat Trout have a total length between 8”-22” (20-56 cm) and body height of 1.8”-4.9” (4.5-12.5 cm). The typical weight of the Lahontan Cutthroat Trout is in the range of 5-10 lb (2.3-4.5 kg). Lahontan Cutthroat Trout have lifespans between 5-14 years.

Set of scaled elevation drawings of the Lahontan Cutthroat Trout
The Lahontan Cutthroat Trout (Oncorhynchus clarkii henshawi) is endemic to Lake Lahontan in northern Nevada. It prefers the slow, meandering cool waters in lakes, rivers, and streams. You can recognize it by the black spots evenly distributed on its body, which may be green, red, or silver.

Lahontan Cutthroat Trout have a total length between 8”-22” (20-56 cm) and body height of 1.8”-4.9” (4.5-12.5 cm). The typical weight of the Lahontan Cutthroat Trout is in the range of 5-10 lb (2.3-4.5 kg). Lahontan Cutthroat Trout have lifespans between 5-14 years.

Set of scaled elevation drawings of the Lahontan Cutthroat Trout
Lahontan Cutthroat Trout (Oncorhynchus clarkii henshawi)
Height:
1.8”-4.9” | 4.5-12.5 cm
Width:
Length:
8”-22” | 20-56 cm
Depth:
Weight:
5-10 lb | 2.3-4.5 kg
Area:
Scientific Name
Oncorhynchus clarkii henshawi
Lifespan
5-14 years

Drawings include:

Lahontan Cutthroat Trout side elevation, front

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Razorback Sucker (Xyrauchen texanus)
Comparison illustration of the size of a Razorback Sucker to other freshwater fish and a typical person

The Razorback Sucker (Xyrauchen texanus) is identified by the keel between its head and dorsal fin. This sharp-edged bulge gives rise to its name. This predorsal keel is also used to distinguish it from juveniles, which lack keel. You will mostly see it in the Colorado River Basin. This fish is long-lived and prefers to spawn in the deep waters of the river. The upper part of the fish is olive or brown-black, while the lower part is lighter yellow. It is relatively large, with females being longer and more robust. It has elongated filaments, long snouts, long, rounded, ventrally compressed heads, and males show longer anal and pelvic fins.

Razorback Suckers have a total length between 1.6’-3’ (48-91 cm) and body height of 3.5”-7.1” (9-18 cm). The typical weight of the Razorback Sucker is in the range of 6.6-13.2 lb (3-6 kg). Razorback Suckers have lifespans between 35-50 years.

Scaled collection of drawings of Razorback Sucker in various poses
The Razorback Sucker (Xyrauchen texanus) is identified by the keel between its head and dorsal fin. This sharp-edged bulge gives rise to its name. This predorsal keel is also used to distinguish it from juveniles, which lack keel. You will mostly see it in the Colorado River Basin.

Razorback Suckers have a total length between 1.6’-3’ (48-91 cm) and body height of 3.5”-7.1” (9-18 cm). The typical weight of the Razorback Sucker is in the range of 6.6-13.2 lb (3-6 kg). Razorback Suckers have lifespans between 35-50 years.

Scaled collection of drawings of Razorback Sucker in various poses
Razorback Sucker (Xyrauchen texanus)
Height:
3.5”-7.1” | 9-18 cm
Width:
Length:
1.6’-3’ | 48-91 cm
Depth:
Weight:
6.6-13.2 lb | 3-6 kg
Area:
Scientific Name
Xyrauchen texanus
Lifespan
35-50 years

Drawings include:

Razorback Sucker side elevation, front

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North American Beaver
Dimensioned size comparison illustration of the North American Beaver compared to an average person

Scientifically known as Castor canadensis and known best for its dam building, the North American Beaver is a semi-aquatic rodent physically distinguished by its broad, flat tail. It is identified as the largest rodent in North America and the second largest in the world just behind the capybara.

The purpose of dam building is to create a deep pond in which the beaver can establish its home. The dam is constructed across streams and consists of a pile of sticks with underwater entrances as the beaver is a skillful swimmer. The home or burrow is then made out of sticks and twigs as well.

North American Beavers have a height of 14.2”-16.9” (36-43 cm), body length between 29”-35” (74-89 cm), and an overall weight in the range of 25-75 lb (11.3-34 kg). The tail length of a North American Beaver is 7.9”-13.8” (20-35 cm). North American Beavers have a typical lifespan of 10-15 years in the wild and up to 15-25 years in captivity.

Collection of scaled drawings of the North American Beaver in various standing poses
Scientifically known as Castor canadensis and known best for its dam building, the North American Beaver is a semi-aquatic rodent physically distinguished by its broad, flat tail. It is identified as the largest rodent in North America and the second largest in the world just behind the capybara.

North American Beavers have a height of 14.2”-16.9” (36-43 cm), body length between 29”-35” (74-89 cm), and an overall weight in the range of 25-75 lb (11.3-34 kg). The tail length of a North American Beaver is 7.9”-13.8” (20-35 cm). North American Beavers have a typical lifespan of 10-15 years in the wild and up to 15-25 years in captivity.

Collection of scaled drawings of the North American Beaver in various standing poses
North American Beaver
Height:
14.2”-16.9” | 36-43 cm
Width:
Length:
29”-35” | 74-89 cm
Depth:
Weight:
25-75 lb | 11.3-34 kg
Area:
Tail Length
7.9”-13.8” | 20-35 cm
Scientific Name
Castor canadensis
Lifespan
10-15 years (wild); 15-25 years (captivity)

Drawings include:

North American Beaver side elevation (standing), front (standing), side (sitting), back (sitting)

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Channel Catfish

The Channel Catfish (Ictalurus punctatus) are also referred to as “Channel cat” and belong to the family Ictaluridae. The fish spearheaded the rapid expansion of aquaculture in the United States. The Channel Catfish is found mainly in fresh and salty water worldwide, though was originally native to the northern and eastern United States.

The Channel Catfish is a cavity nester, preferring areas of limited light conditions and a sedentary lifestyle. The Channel Catfish is identified by its cross-sectional cylindrical body that lacks scales, dorsal and pectoral fins spotting sharp and hard spin, barbels around the mouth for tasting and smelling, and prefers to feed at night.

Channel Catfishs have a total length between 12”-24” (30.5-61 cm), body height of 2”-4.5” (5-11.4 cm), and an overall weight in the range of 2-7 lb (.9-3.2 kg). The typical lifespan of the Channel Catfish is 15-25 years.

Scaled collection of drawings of Channel Catfish in front and side poses
The Channel Catfish (Ictalurus punctatus) are also referred to as “Channel cat” and belong to the family Ictaluridae. The fish spearheaded the rapid expansion of aquaculture in the United States. The Channel Catfish is found mainly in fresh and salty water worldwide.

Channel Catfishs have a total length between 12”-24” (30.5-61 cm), body height of 2”-4.5” (5-11.4 cm), and an overall weight in the range of 2-7 lb (.9-3.2 kg). The typical lifespan of the Channel Catfish is 15-25 years.

Scaled collection of drawings of Channel Catfish in front and side poses
Channel Catfish
Height:
2”-4.5” | 5-11.4 cm
Width:
Length:
12”-24” | 30.5-61 cm
Depth:
Weight:
2-7 lb | .9-3.2 kg
Area:
Scientific Name
Ictalurus punctatus
Lifespan
15-25 years

Drawings include:

Channel Catfish side elevation, front

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Walleye
Measured comparison illustration of the size of a Walleye to a typical person

The Walleye (Sander vitreus) are members of the family Percidae native to most freshwater bodies in Canada and the Northern United States. Its name comes from its eyes that are pointed upwards. These freshwater fish are nocturnal and prefer to travel in shallow waters.

Walleyes are one of the most commonly stocked game fish, distinguished by a big mouth with sharp teeth, long and thin bodies with gold or olive color patterns, and a white underside. They also have five or more color bands crossed on their backs. Besides, the Walleye has two dorsal fins (one spiny and another soft-rayed) and migrate to tributary streams to breed.

Walleyes have a total length between 22”-42” (56-107 cm), body height of 4.5”-8.5” (11.4-21.6 cm), and an overall weight in the range of 3-7 lb (1.4-3.2 kg). The typical lifespan of the Walleye is 15-25 years.

Scaled collection of drawings of Walleye in front and side poses
The Walleye (Sander vitreus) are members of the family Percidae native to most freshwater bodies in Canada and the Northern United States. Its name comes from its eyes that are pointed upwards. These freshwater fish are nocturnal and prefer to travel in shallow waters.

Walleyes have a total length between 22”-42” (56-107 cm), body height of 4.5”-8.5” (11.4-21.6 cm), and an overall weight in the range of 3-7 lb (1.4-3.2 kg). The typical lifespan of the Walleye is 15-25 years.

Scaled collection of drawings of Walleye in front and side poses
Walleye
Height:
4.5”-8.5” | 11.4-21.6 cm
Width:
Length:
22”-42” | 56-107 cm
Depth:
Weight:
3-7 lb | 1.4-3.2 kg
Area:
Scientific Name
Sander vitreus
Lifespan
15-25 years

Drawings include:

Walleye side elevation, front

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