Measure the Fish, Match the Water and Check for a Special Lake Rule Before Keeping It
Ohio does not use one minimum size for every fish. A largemouth bass may need to be 12 inches in a general inland water, 18 inches at Knox Lake, or outside a protected slot at another lake.
This practical guide separates statewide rules from Lake Erie, Ohio River, Pymatuning and site-specific regulations so anglers can make a fast keep-or-release decision at the water.
What Are Ohio’s General Fish Size Limits?
In general Ohio public waters, largemouth, smallmouth and spotted bass have a 12-inch minimum. Blue and flathead catfish have a special 35-inch trophy threshold, while channel catfish use a 28-inch threshold.
Most general inland walleye, sauger, saugeye, yellow perch, muskellunge and trout do not have a statewide minimum size in the annual table. However, Lake Erie, the Ohio River, Pymatuning Lake and many named inland waters impose separate minimums or protected size ranges.
Measure total length with the fish’s mouth closed and tail fin compressed. Never apply the general statewide table until you have searched for the exact lake, reservoir or river section.
Ohio Fish Size Rule Hierarchy
Check the regulations in this order. Stop when you find a rule naming the exact water and species.
Species identity
Confirm whether the fish is largemouth, smallmouth, spotted bass, saugeye, walleye, sauger, trout or another species.
Fishing district
Determine whether the water is statewide inland, Lake Erie, Ohio River or Pymatuning.
Named-water exception
Search the exact lake, reservoir, river section, wildlife-area pond or connecting river.
Date and posted rule
Lake Erie bass sizes change by date, and local posted restrictions may be stricter.
Check Whether an Ohio Fish Is Legal to Keep
Can you positively identify the species?
Smallmouth, spotted and largemouth bass can share waters. Walleye, sauger and saugeye also have different appearances.
What exact waterbody or river section?
Record the lake, reservoir, river, tributary, harbor, connecting channel or boundary-water unit.
Is the water listed under a special regulation?
A named-water minimum, protected slot or split limit overrides the statewide rule.
Does the size rule change by date?
Lake Erie black bass use a 14-inch or 18-inch minimum depending on the season period.
Was the fish measured correctly?
Close the mouth, place the head at the board stop and compress the tail fin for total length.
Is the fish inside a protected slot?
A fish can be longer than a general minimum and still be illegal when it falls inside a protected range.
Is the fish exactly on or extremely close to the line?
A properly measured fish meeting the minimum can qualify, but any uncertainty in fish position, ruler accuracy or tail compression creates risk.
Safe decision standard
Keep: species, water, date, daily limit and measurement are all clear.
Recheck: the fish is close to the legal length or the water may have a special rule.
Release: species is uncertain, fish is undersized, fish is inside a protected slot or possession is prohibited.
How to Measure a Fish Under Ohio Rules
Use a rigid measuring board whenever possible
-
Wet the measuring board.
A wet surface protects the fish’s slime coating and helps prevent dry abrasion. -
Place the fish on its side.
Keep the body straight rather than curved around the edge of a cooler or boat seat. -
Close the fish’s mouth.
An open mouth can create an inaccurate total-length reading. -
Place the front of the fish against the zero stop.
Do not begin at the first visible number if the board has an offset before zero. -
Compress the tail fin.
Gently bring the tail lobes together to obtain total length. -
Read the farthest tail point.
View the ruler directly from above to avoid an angled reading. -
Release borderline fish.
Do not stretch the fish, push the jaw forward or force the tail beyond its natural compressed position.
Ohio Statewide Fish Size Limits for 2026–27
These rules apply to Ohio public waters unless Lake Erie, Ohio River, Pymatuning or a named site-specific regulation replaces them.
| Species or size group | Statewide minimum | Daily-limit connection | Practical keep-or-release rule |
|---|---|---|---|
| Blue and flathead catfish under 35 inches | No minimum | No statewide daily limit for fish under 35 inches | Check Ohio River, Pymatuning and local rules |
| Blue and flathead catfish 35 inches or larger | 35-inch threshold | Only one of each species statewide per day | Count large fish across every Ohio water visited that day |
| Channel catfish under 28 inches | No minimum | No statewide daily limit for fish under 28 inches | Check local lake and boundary-water rules |
| Channel catfish 28 inches or larger | 28-inch threshold | Only one statewide per day | Do not treat the threshold as a minimum required to keep smaller fish |
| Largemouth, smallmouth and spotted bass | 12 inches | Five singly or in combination | Search the lake name because many waters use 15-inch, 18-inch, split or slot rules |
| Muskellunge | No statewide minimum | One | Ohio River and Pymatuning use a 30-inch minimum |
| Striped, hybrid-striped and white bass | No general minimum | 30 combined; no more than four may exceed 15 inches | Measure larger fish and count the over-15-inch group separately |
| Trout | No statewide minimum | Five combined | Lake Erie uses 12 inches; some inland streams also use 12 inches |
| Walleye, sauger and saugeye | No statewide minimum | Six combined | Lake Erie and several inland reservoirs use 15 inches; the western Ohio River unit uses 14 inches |
| Yellow perch | No statewide minimum | 30 | Lake Erie has no minimum but uses zone-based daily limits |
How Ohio’s Large Catfish Size Rule Works
Channel catfish
Fish under 28 inches have no general statewide minimum or daily limit.
Only one channel catfish measuring 28 inches or longer may be possessed statewide per day.
Blue catfish
Fish under 35 inches have no general statewide minimum or daily limit.
Only one blue catfish measuring 35 inches or longer may be possessed statewide per day.
Flathead catfish
Fish under 35 inches have no general statewide minimum or daily limit.
Only one flathead measuring 35 inches or longer may be possessed statewide per day.
Lake Erie Fish Size Limits for 2026–27
| Species | Date or location | Minimum size | Important daily-limit rule |
|---|---|---|---|
| Largemouth, smallmouth and spotted bass | March 1–April 30, 2026 | 14 inches | Five combined |
| Largemouth, smallmouth and spotted bass | May 1–June 26, 2026 | 18 inches | One combined |
| Largemouth, smallmouth and spotted bass | June 27, 2026–February 28, 2027 | 14 inches | Five combined |
| Walleye, saugeye and sauger | 2026 Lake Erie season | 15 inches | Six combined under the announced 2026 limit |
| Trout and salmon | Lake Erie and the entire length of its creeks, rivers and tributaries | 12 inches | Two or five combined depending on date |
| Trout and salmon | Cold Creek upstream of State Route 2 | No minimum | Five combined |
| Striped, hybrid-striped and white bass | Open year-round | No minimum | No Lake Erie daily limit in the annual table |
| Yellow perch | West, Central and East zones | No minimum | Zone-based daily limits apply |
Ohio River Fish Size Limits
The Ohio River uses Western and Eastern agreement units. Boat location, shoreline and licensing state can determine which regulation applies.
| Species | Unit or jurisdiction | Minimum size | Daily limit |
|---|---|---|---|
| Largemouth, smallmouth and spotted bass | Western Unit — applicable Ohio regulations | 12 inches | Six combined |
| Largemouth, smallmouth and spotted bass | Eastern Unit — unified Ohio and West Virginia regulation | 12 inches | Six combined |
| Muskellunge | Western and Eastern unified regulations | 30 inches | Two |
| Walleye, sauger and saugeye | Western Unit unified regulation | 14 inches | Six combined |
| Walleye, sauger and saugeye | Eastern Unit — Ohio shoreline and Ohio tributary regulation | No Ohio minimum listed | Six combined |
| Black and white crappie | Ohio River agreement waters | No minimum | 30 combined |
| Striped, hybrid-striped and white bass | Unified agreement regulation | No minimum | 30 combined; no more than four over 15 inches |
Ohio Lakes With Special Bass Size Limits
Knox Lake
Largemouth, smallmouth and spotted bass have a five-fish combined daily limit and an 18-inch minimum.
Five bass combined, each at least 15 inches
Two bass under 15 inches and two bass 15 inches or longer
Two bass under 14 inches and one bass 20 inches or longer
Five bass daily, but none may be taken in the protected range
Ohio Waters With a 9-Inch Crappie Minimum
Black and white crappie have a 30-fish combined daily limit and a 9-inch minimum in the following listed waters:
Ohio Inland Waters With a 15-Inch Walleye, Saugeye and Sauger Minimum
The following waters use a six-fish combined daily limit and a 15-inch minimum for walleye, saugeye and sauger:
Berlin
Measure walleye, saugeye and sauger before placing them in a livewell or on a stringer.
C.J. Brown
The 15-inch minimum replaces the general inland no-minimum-size row.
LaDue
Count all three species together toward the six-fish limit.
Lake Milton
The rule includes the Mahoning River connecting Berlin Lake and Lake Milton.
Mosquito Creek Lake
Do not apply the statewide no-minimum rule at this listed lake.
West Branch
Fish must reach the 15-inch minimum when the site-specific rule applies.
Ohio Trout Size Limits by Stream
| Water | Daily limit | Minimum size | Important note |
|---|---|---|---|
| Mad River and its tributaries | Two | 12 inches | Measure trout before retaining |
| Clear Fork of the Mohican River in Richland County | Two | 12 inches | The county section matters |
| Clear Creek — specified Fairfield and Hocking County reach | Two | No minimum | Follow the bridge-to-bridge boundary in the official rule |
| Clear Fork of the Mohican River in Ashland County | Two | No minimum | Do not apply the Richland County 12-inch rule automatically |
| Ashtabula, Chagrin, Grand and Conneaut rivers and tributaries | Brook trout possession prohibited | Release all brook trout | The prohibition is species-specific |
Pymatuning Lake Fish Size Limits
| Species | Minimum size | Daily limit | Practical note |
|---|---|---|---|
| Black and white crappie | 9 inches | 20 combined | Different from the general Ohio River crappie rule |
| Largemouth and smallmouth bass | 12 inches | Five combined | Spotted bass is not listed in this Pymatuning row |
| Muskellunge | 30 inches | Two | Do not use the statewide no-minimum muskie rule |
| Walleye | 15 inches | Six | Measure before retaining |
| All other fish | None under the Pymatuning table | No limit under that table | Protected-species and method rules still apply |
Minimum Sizes, Protected Slots and Split Limits Explained
Fish must reach the stated length
A 15-inch minimum generally means a properly measured fish must be at least 15 inches before it may be retained.
Example: Lake Erie walleye.
Fish inside the range must be released
A bass can be longer than the statewide minimum yet remain protected because its length falls inside a lake-specific range.
Example: listed waters protecting bass between 12 and 15 inches.
The daily bag is divided by size
An angler may keep only a stated number below one length and a stated number at or above another length.
Example: two bass under 14 inches and one bass 20 inches or longer.
Practical Ohio Fish Measurement Scenarios
An 11¾-inch largemouth bass from a general inland lake
The statewide black-bass minimum is 12 inches. The fish is undersized and must be released unless a different rule provides otherwise.
Action: release it immediately and avoid rounding the measurement upward.
A 16-inch Lake Erie smallmouth caught on June 1
The May 1–June 26 Lake Erie minimum is 18 inches, so the fish cannot be retained.
Action: release it even though it exceeds Ohio’s general inland 12-inch bass minimum.
A 15-inch walleye from Mosquito Creek Lake
Mosquito Creek Lake uses a 15-inch site-specific minimum. A fish that properly measures exactly 15 inches may meet the minimum.
Action: remeasure carefully and release it if the mouth, tail or board position creates doubt.
A 30-inch channel catfish from a general inland water
Channel catfish do not need to reach 28 inches to be legal. The 28-inch threshold limits the number of large fish.
Action: the angler may retain only one channel catfish at least 28 inches statewide that day.
A group has five hybrid-striped bass longer than 15 inches
The statewide combined limit permits no more than four striped, hybrid-striped or white bass over 15 inches.
Action: the fifth fish over 15 inches cannot be retained by that angler.
A 13½-inch bass from a protected-slot lake
The fish falls inside the listed protected 12–15-inch range.
Action: release it even though it is longer than the general 12-inch minimum.
A crappie curls while being measured on the ice
A curved fish can appear shorter or longer depending on tape placement.
Action: use a flat rigid board, straighten the body and measure total length from above.
Ohio Fish Size Limit Trip Checklist
-
Write down the exact waterbody.
Include the reservoir, river section, tributary, harbor, lake zone or connecting channel. -
List the species you may retain.
Include similar species that are counted together. -
Search for a site-specific rule.
Do this even when you already know the general statewide minimum. -
Check the fishing date.
Lake Erie bass size limits change during the regulation year. -
Prepare a rigid measuring board.
Confirm that zero begins at the board stop and that the markings are readable. -
Save the official table offline.
Keep a screenshot showing the species, water, minimum size and daily limit. -
Assign one person to measure group catches.
Consistent measurement reduces disagreement and rushed decisions. -
Recheck the livewell.
Confirm every retained fish remains legal before leaving the water.
Common Ohio Fish Size Limit Mistakes
Using the statewide bass minimum everywhere
Many named lakes use 15-inch, 18-inch, split or protected-slot rules.
Using Lake Erie rules above a tributary boundary
The Lake Erie district ends at specific bridges, roads or dams.
Measuring with the mouth open
Ohio’s official diagram requires the mouth closed.
Leaving the tail spread naturally
The tail fin should be compressed when determining total length.
Measuring around the fish’s curve
A flexible tape following the body is not the same as straight total length.
Rounding up a short fish
An 11¾-inch fish does not become a legal 12-inch fish through rounding.
Confusing trophy thresholds with minimum sizes
Smaller channel, blue and flathead catfish are not prohibited by the statewide large-fish threshold.
Ignoring a protected slot
A fish may exceed the statewide minimum but remain illegal because it falls inside a protected range.
Counting species separately when the rule combines them
Black bass, walleye groups, trout groups and striped-bass groups may share one combined limit.
Using Fish Ohio award sizes as legal minimums
Fish Ohio recognition lengths are trophy-program qualifications, not harvest-size regulations.
Using an old screenshot
Lake Erie limits, site-specific regulations and property rules can change.
Keeping an unidentified protected fish
Endangered fish and protected brook trout must be released regardless of apparent size.
Ohio Division of Wildlife Contact, Address and Map
Contact ODNR when the fish is near a slot boundary, the water has more than one name, the boat crossed a Lake Erie or Ohio River boundary, or the regulation table appears unclear.
Ohio Division of Wildlife
614-265-6300
wildinfo@dnr.ohio.gov
Monday through Friday, 8 a.m. to 5 p.m.
2045 Morse Road, Building G
Columbus, OH 43229
Official Ohio Fish Size Limit Resources
2026–27 Ohio Fishing Regulations
Why use it: the official booklet contains statewide, Lake Erie, Ohio River, Pymatuning and site-specific size tables.
After opening: check the statewide table and then search the exact waterbody name for an exception.
Open the official 2026–27 regulation PDFCurrent Ohio fishing regulations page
Why use it: ODNR publishes current annual regulations, Lake Erie updates and special-regulation notices.
After opening: check for newer announcements or corrected limits posted after the booklet was printed.
Check current Ohio fishing regulationsOhio Administrative Code sport-fishing rules
Why use it: the Administrative Code provides detailed legal rules behind the annual summary.
After opening: review Chapter 1501:31-13 for sport fishing, site-specific limits, Lake Erie and Ohio River rules.
Read Ohio’s official sport-fishing rulesLake Erie reports, forecasts and limits
Why use it: Lake Erie walleye and yellow perch daily limits are announced annually.
After opening: confirm the walleye limit, perch zone and current report before launching.
Check Lake Erie reports and limitsFish Ohio recognition program
Why use it: this program lists trophy-recognition lengths for qualifying catches.
After opening: use the measurements only for recognition eligibility, not as legal harvest minimums.
Review Fish Ohio qualifying lengthsOhio fishing license information
Why use it: size limits apply whether the angler uses a paid license, age exemption, private-water exemption or Free Fishing Days.
After opening: confirm the correct fishing privilege before the trip.
Review Ohio fishing license requirementsOhio Fish Size Limit FAQs
What is the minimum bass size in Ohio?
The general inland minimum for largemouth, smallmouth and spotted bass is 12 inches. Lake Erie, the Ohio River and many named inland waters use different minimums, split limits or protected slots.
What is the 2026 Lake Erie bass size limit?
The minimum is 14 inches from March 1 through April 30, 18 inches from May 1 through June 26, and 14 inches again from June 27, 2026 through February 28, 2027.
What is the Ohio walleye size limit?
General inland waters have no statewide walleye minimum unless a special rule applies. Lake Erie and listed inland waters such as Berlin, C.J. Brown, LaDue, Lake Milton, Mosquito Creek Lake and West Branch use a 15-inch minimum.
What is the Lake Erie walleye minimum size?
Lake Erie walleye, saugeye and sauger have a 15-inch minimum size. The announced 2026 daily limit is six fish combined.
Is there a minimum crappie size in Ohio?
There is no general statewide crappie minimum, but numerous listed lakes and reservoirs use a 9-inch minimum. Pymatuning Lake also uses a 9-inch crappie minimum.
How do I measure a fish legally in Ohio?
Measure total length with the fish’s mouth closed and tail fin compressed. Place the head against the zero stop on a straight measuring board and read the farthest tail point from directly above.
Can I keep a fish that measures exactly the minimum length?
A fish that is properly measured at the stated minimum may meet the minimum-size requirement. Because slight positioning or ruler errors can change a borderline reading, releasing an uncertain fish is the safer choice.
What does an Ohio protected slot limit mean?
A protected slot requires fish within the stated length range to be released. Fish outside the protected range may be kept only when the daily limit and every other regulation are satisfied.
What are Ohio’s large catfish size limits?
Ohio permits only one channel catfish measuring 28 inches or longer, one blue catfish measuring 35 inches or longer and one flathead catfish measuring 35 inches or longer statewide per day. These are large-fish thresholds rather than minimum sizes for smaller catfish.
What is the Ohio River walleye size limit?
The Western Ohio River agreement unit uses a 14-inch minimum for walleye, sauger and saugeye. The Eastern Unit can use different rules depending on the angler’s location and jurisdiction.
What are the Pymatuning Lake fish size limits?
Pymatuning uses a 9-inch crappie minimum, 12-inch largemouth and smallmouth bass minimum, 30-inch muskellunge minimum and 15-inch walleye minimum.
Do Ohio Free Fishing Days remove fish size limits?
No. Free Fishing Days remove the license-purchase requirement for eligible Ohio residents, but minimum sizes, protected slots, daily limits, seasons and fishing-method rules continue to apply.
Editorial verification: Ohio’s 2026–27 Fishing Regulations, statewide size table, Lake Erie rules, Ohio River agreements, Pymatuning rules, site-specific waters and current 2026 Lake Erie limit announcement were reviewed on July 27, 2026.
Independent information notice: OhioFishingLicense.website is an independent informational resource and is not operated by the Ohio Department of Natural Resources. This guide provides general educational information, not legal advice. Current statutes, administrative rules, emergency orders, posted signs and official ODNR guidance control.