2 ways to determine the sex of a trout

By Kent Klewein, Gink & Gasoline

Is that trout male or female?

One of the things I love most about being a part of Gink & Gasoline, is educating our readers. Today’s post, talks about two ways to determine the sex of a trout. Over the years, I’ve found that the majority of my clients have a hard time determining whether a trout they catch is a male or female. Below are two ways to quickly identify the sex of a trout.

1. Look at the mouth

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. Look at the anal fin

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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Originally published here.