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1. One of best ways to distinguish the sex of a trout is to examine the mouth. Female trout all have a short rounded nose or upper jaw, while male trout have a more elongated snout. If your trout has a lower jaw with a kype, it's a male for sure. Although the mouth of a female trout will grow larger as it ages and increases in size, the mouth will never grow a kype (hooked lower jaw). Upon becoming sexually mature, male trout will begin to grow a pronounced kype. At first, it will just be a tell-tale sign, but as a male trout ages, its kype will become more pronounced. It's important to point out that even for trout that aren't sexually mature, an angler can look at the mouth of a trout and see either a uniform mouth with a short rounded nose (female), or a elongated snout with a slightly longer lower jaw (male).

2. Sexually mature male and female trout for both rainbows and browns have different looking anal fins. A male will have a slight convex anal fish "(", while a female trout's anal fin will be slightly concave ")". I'm not sure if cutthroat trout are in the same boat. I'll have to depend on the community who regularly catch them, to provide us their insight and confirm this.

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9y ago
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9y ago

The male rainbow trout has a long jaw and a pointy mouth while the female has a short jaw and a round mouth.

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12y ago

Female trout are larger than male trout.

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Q: How do you know if a trout is male or female?
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