A freshly caught silver on the sand
Silver surfperch, Hyperprosopon ellipticum

I’ve made the case that color matters to surfperch in the wild and I demonstrated this by showing that given a choice, silver surfperch, Hyperprosopon ellipticum, take orange colored lures at rates higher than you would expect by chance alone. If you want to read about why color might matter to surfperch, and the details of my experiment, check out Choices, Choices…Everywhere.

On sand
Staghorn sculpin, Leptocottus armatus

While I was exploring lure color preference in silver surfperch, plenty of staghorn sculpins, Leptocottus armatus, also made choices about my lures. I show the results below. As you can see from the the photo above, staghorns blend into the sandy background on outer shores beaches. They have small eyes, the sexes are similar, they have external fertilization, and neither sex shows off any colorful adornments such as bright spots or fins. So they are a very different from the surfperches they share the beaches with from June to September. If you want to read more about staghorns, check out A Camoflaged Big-mouth on Summer Shores and Cammo Rules!

36829493894_e7098e0e9b_b
Colorful soft plastic lures

Here are the lures I presented to fish in the wild: black, yellow, red, orange, and pumpkinseed (the brown lure with black specks).

37540185691_26bc53660c_b
Bay ghost shrimp, Neotrypaea californiensis

And there was one other choice, bait, a chunk of bay ghost shrimp, Neotrypaea californiensis. These crustaceans are commonly sold as bait where they are known as sand shrimp. As far as I know, all fish love them.

Chart showing take rates of black, red, yellow, p-seed, and orange lures, and bait
Staghorn sculpin take rates for colored lures and bait

Fifty-eight staghorns committed to my presentations and, superficially, the results look similar to what we saw with the silver surfperch. One exception is that bait did a lot better with staghorns than with silvers. With their large gape and attitude about food this isn’t a surprise. Pumpkinseed and orange lures were slightly over-represented and black and red lures were under-represented compared to what we would expect by chance. However, the signal isn’t very strong and I can’t really reject the idea that all of this is quite independent of color.

Is the weak signal a sign that there is no lure preference in staghorns? Or was there something else about my design that might have made any preference hard to detect? To test this I repeated my experiment on a smaller scale with several refinements. First, I improved the presentation, removing any beads or other adornments near the lures that might have influenced choice. Next, I got rid of bait…what a silly idea that was. I also standardized some things about how long lures were in the water and how I recorded notes, and finally, I swapped out the flecked pumpkinseed lure for a very similar brown (flesh-colored) lure without flecks.

Chart of take rates of black brown, orange, and red lures
Staghorn sculpin take rates for colored lures

In my refined experiment black is still under-represented but this time red is over-represented compared to the chance expectation, but once again the signal is not strong and I can’t reject the idea that the choices staghorns are making are independent of color. Other than the apparent dislike of black lures in both experiments, the patterns of lure color choice seem to be weak and unstable. Thus, staghorns seem to lack the orange bias seen in silver surfperch and maybe color doesn’t matter when cammo rules. How do these results compare to your predictions about lure choice by staghorns?

Note: I updated the images and lightly edited the text on October 7, 2017. If you like the color preference stuff, you might be interested in To Bite, or Not to Bite, which follows up on the work presented here.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s