Ontario Fishing Size Limits: The Keeper Rules In Plain English
In Ontario, "size limits" are species-specific rules that define which fish you may keep; if a fish is outside the allowed size range (or exceeds the legal catch/possession limits), you must immediately release it.
Ontario fishing size limits: keeper rules
Ontario's recreational rules separate limits into catch limits, possession limits, and size restrictions, and you must follow all three simultaneously for each species and fishing context. The key practical takeaway for anglers is simple: if the fish doesn't meet the size rule (or you've hit your legal number), it can't be kept.
Ontario's regulations state that if you catch fish that exceed the size restrictions and/or the catch/possession limits, you must immediately release them. The Ontario Fishing Regulations Summary is the authoritative place where these limits are shown for each species.
How to read size limits fast
In the regulations summary, size limits are often expressed as ranges with special notes, like "none between" certain lengths for one licence category, and a different approach for another. When you see a size rule, treat it as a hard gate: even if you are under your daily catch number, you still cannot keep undersized or oversized fish if the size restriction forbids it.
- Match the licence type: sport fishing rules can differ from conservation fishing rules for the same species.
- Check the length measurement: Ontario uses length in centimetres (and the summary provides inch conversions alongside).
- Plan your livewell strategy: fish held for possible release must comply with applicable size limits and retain/catch limits, not just "overall" daily totals.
- Release immediately when required: Ontario is explicit that any fish exceeding the size/catch/possession limits must be released right away.
Typical keeper logic (what you can keep)
Ontario describes two common patterns: one licence category may have a length "gap" (meaning you cannot keep fish in a middle range), while another may allow "any size" but still restrict quantity. Either way, your "keep" decision must satisfy both the size restriction and the allowed number you may catch/retain.
- Identify the species and find its rule in the Ontario Fishing Regulations Summary.
- Confirm your licence category (sport vs conservation), because size/retain rules can change.
- Measure the fish length and compare to the published length rule (watch for "none between" or "not more than" notes).
- Verify catch & possession limits are not exceeded at any one time, not merely "over the day."
- Release immediately if disallowed to comply with Ontario's immediate release requirement.
Size limits examples (plain-English templates)
Ontario provides worked examples of how to interpret size restrictions, including cases where a sport licence has a prohibited mid-range and a maximum number that can be above a threshold length. Another pattern shows "any size" for a conservation licence, but with a strict limit on how many fish can be caught/retained.
| Species rule style | What it usually means | What you must do |
|---|---|---|
| "None between X-Y cm" (sport licence) | Fish in that length band can't be kept; only certain longer fish may be retained (subject to quantity notes). | Immediately release any fish caught in the forbidden band. |
| "Any size" (conservation licence) | Length may not be the restriction, but the number you can catch/retain is still limited. | Keep only within the permitted catch/possession quantity; release everything else. |
| At-one-time livewell limits | Even if you stay under daily totals, Ontario limits what you can hold for retain/release decisions at one time. | Only hold fish that comply with size limits and retain/catch limits, and live-release only if they'll survive. |
Livewell, release, and "waste" rules
Ontario's regulations summary includes conditions for fish held in a livewell, including that fish must comply with applicable size limits and that daily catch/retain limits for certain species are not exceeded at any one time. Ontario also emphasizes that anglers must monitor fish condition closely, and only fish likely to survive should be released.
Ontario warns that releasing a fish that will not survive, and allowing the flesh of that fish to be wasted, is an offence, and fish that are not live released count as part of your catch and possession limit. If you're planning a longer charter-style day on the water, this matters because your "how many fish I can carry" strategy is tied to both size rules and at-one-time limits.
"You must immediately release any fish that exceed the size restrictions and catch and possession limits."
FAQ
What are the most common questions about Ontario Fishing Size Limits The Keeper Rules In Plain English?
What counts as a "size limit" in Ontario?
It's the species-specific rule that restricts which lengths you may keep, and it must be followed together with catch limits and possession limits; fish outside the allowed size range must be immediately released.
If I'm under my daily catch limit, can I keep an oversized fish?
No-Ontario requires immediate release for any fish that exceed the size restrictions (even if you haven't hit your quantity yet), as well as any fish that exceed catch/possession limits.
Do size limits differ by licence type?
Yes. Ontario's summary shows that sport and conservation fishing licence rules can differ for the same species, including patterns like prohibited length ranges versus "any size" with a strict retain limit.
What if I caught the wrong size-do I have to keep going or can I release safely?
Ontario's requirement is to release immediately if the fish fails the size (or catch/possession) rules, and the regulations also stress careful handling so released fish are likely to survive.
How do at-one-time limits affect what I keep?
Ontario includes rules for what may be held at one time (including livewell limits for certain species like walleye or northern pike, and combined bass limits), meaning your holding and retention choices must stay compliant at any given moment-not just at the end of the day.
