Fisheries surveys show Lakes with lots of bass, channel cats

Posted on: June 19, 2019 | Bob Frye | Comments

Fisheries surveys are interesting.

Fisheries surveys at a few lakes showed some real potential for largemouth bass fishing.
Bob Frye/Everybody Adventures

So you want to catch some fish, huh?

Well, here’s a tip. Start by casting your line where the fish are.

Pretty sage stuff there, I know. Confucius-esque, almost.

But if you want to catch fish, you’ve got to know what waters the fish call home and in what sizes and numbers.

The good news is, there’s a way to pin that down. Biologists with state fish and wildlife agencies each year survey lakes, streams and rivers to get a handle on fish populations. Not every water gets examined every year. Indeed, in many cases, they go years between looks.

But the survey reports are a starting point, a sort of CliffNotes for anglers.

And we’ve got them. Each week or so over the next few months, we’ll provide the lowdown on the latest fisheries surveys from across Pennsylvania.

Here’s episode #1.

Lower Twin Lake

Largemouth bass and channel catfish are the story here.

This 30-acre Westmoreland County park lake is home to a huge concentration of bass. Biologists caught 356 in 2017 and 295 in 2018, in less than an hour each time.

That catch rate ranks among the highest in the state.

The downside, historically, is that most of Lower Twin’s bass were small. Fish in the 8- to 11-inch range predominated a decade ago.

But perhaps things are changing.

Pennsylvania Fish and Boat Commission biologist noticed a “sharp” increase in fish longer than 12 and 15 inches in 2017 and 2018. Bass exceeding 20 inches and 5 pounds turned up both years.

As for catfish, the commission used to stock Lower Twin each year with fingerling catfish, ones measuring 2- to 3-inches long. In 2014 it also started releasing yearling fish in the 8- to 10-inch range.

All those fish were fin clipped in unique ways to see if bigger or smaller catfish better survive the lake’s predatory largemouth bass.

Not surprisingly, perhaps, bigger catfish survive better. And that’s set the stage for better fishing.

When surveyed in 2010, Lower Twin produced just one channel cat. When surveyed in 2018, it gave up 39. They ranged from 8 to 27 inches.

“Of the 39 fish captured, 32 fish were determined to have been fin clipped and 31 were stocked as yearlings,” said commission biologist Mike Depew.

Many of the yearlings from the 2014-15 stockings were already in the 16-20 inch size range, with some of the 2014 yearlings having grown into the 25-27 inch size range, he said.

As for the other fish in Lower Twin, well, that’s a mixed bag.

Biologists handled both black and white crappies, with a few large individuals reaching 14 inches. Most were smaller than 9, however.

The lake’s bluegills are generally small, too, though more than half of the pumpkinseeds exceed 7 inches.

A hidden gem might be the lake’s yellow perch. They aren’t as common as bluegills or crappies, but they do tend to be pretty decent. Sixty-four percent of the fish caught in the most recent survey were 9 inches or longer.

Upper Twin Lake

This 20-acre lake is the smaller Twin in Westmoreland’s Twin Lakes Park. It’s similar to its sibling in a couple of ways.

Namely, it, too, is full of largemouth bass and channel catfish.

But, in the case of the bass anyway, they’re not doing as well. Biologists handled 302 largemouths in 2017 and 184 in 2018. Both figures are up – and 2017’s considerably – from a decade ago.

Most of the fish remain between 8 and 11 inches, however. Fewer than 1 percent of those handled in 2017 and only 2 percent of those caught in 2018 exceeded 15 inches.

“More encouraging,” Depew said, is the situation with channel cats. When last surveyed in 2009, Upper Twin produced two channel cats. In 2018 it gave up 129, ranging from 7 to 27 inches.

Eighty-seven of those were stocked as yearlings, according to fin clips.

Of the remaining 42 fish, Depew said some were likely stocked as fingerlings prior to the study being initiated. But there may also be natural reproduction occurring.

Biologists noticed a lot of catfish congregating around structures known as catfish spawning boxes.

“Although one may assume that catfish fry from natural reproduction in the lake would be an easy target for predatory fish such as largemouth bass, the sheer number of fry produced, coupled with the behavioral characteristic that fry are guarded by the parental male catfish and protected from predators, may allow for better survival of these naturally reproduced fry than our stocked fingerlings,” Depew said.

Other stars at Upper Twin – to a degree anyway — are its white crappies and yellow perch. Neither are necessarily plentiful. Biologists caught just 25 black crappies and 37 perch in their nets.

But 92 percent of the crappies and 49 percent of the perch exceeded 9 inches.

Canonsburg Lake

This is a 76-acre Fish and Boat Commission-owned lake in Washington County. Like Upper and Lower Twin, it’s another lake where the commission is experimenting with stocking larger channel catfish.

And also like at those two, the effort here seems to be working.

Biologists surveyed Canonsburg in 2000 and 2012, getting 23 and 31 channel cats, respectively. By comparison, in 2018, they got 102 ranging in size from 3 to 23 inches.

“Furthermore, of the 102 fish captured, 68 were determined to have been fin clipped and 67 were stocked as yearlings,” Depew said.

Their larger size when released is the key, he said.

“The reason for the overwhelming success of the yearlings comes down to size. The dense population of small to medium sized largemouth bass can easily eat 2- to 3-inch fingerlings but only the largest fish can eat 8- to 10-inch yearlings,” Depew said.

And Canonsburg holds lots of bass, though not as many as before.

The total caught in 2018 (58) was down from both 2012 (93) and 2000 (88). But it still exceeds guidelines for a “big bass” lake, Depew said.

That’s good, because aside from channel cats and bass, Canonsburg offers little else in the way of quality fish.

Oh, you can go there and catch a lot of panfish, Depew said. Bluegills and black and white crappies are abundant.

But they’re almost uniformly small, rare being the one more than 7 inches.

“Competition with gizzard shad for food resources is likely affecting the size structure of the panfish populations in Canonsburg Lake,” Depew said.

Next week: A look at a number of lakes where muskies are and aren’t doing well.


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Bob Frye is the editor. Reach him at 412-838-5148 or See other stories, blogs, videos and more at

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