Rock Bass Lakes in Ontario

Government fish surveys have recorded rock bass in 532 Ontario lakes, 22% of the 2,365 lakes in this atlas with sport-fish records.

Lakes: 532
Recorded since 2010: 357
Median size: 5.12 km²
Median max depth: 24 m
Latest record: 2918

Where rock bass is most consistently recorded

Ranked by consistency: the lower bound of a 95% confidence interval on the share of the lake’s surveys that found it. A lake where 18 of 20 surveys found it ranks above one where 1 of 1 did. Lakes known only from stocking come last.

#	Lake	Surveys	Last record	Max depth m	Area km²
1	Lake CouchichingSimcoe	53 of 60	2013		47.1
2	Gillies LakeBruce	20 of 21	2012	32	2.17
3	Leggat LakeFrontenac	22 of 24	2014	18	1.82
4	Little LakeSimcoe	27 of 31	2020	10	4.01
5	Pearl LakeCochrane	19 of 21	2019		0.27
6	Little Basswood LakeAlgoma	25 of 29	2019	10	2.17
7	Katchewanooka LakePeterborough	31 of 37	2014		3.62
8	Big Salmon LakeFrontenac	7 of 7		40	1.62
9	Lower Island LakeAlgoma	14 of 16	2021	8	0.58
10	Cloud LakeThunder Bay	17 of 20	2015	15	4.03
11	Little LakePeterborough	29 of 37	2015		0.59
12	Nine Mile LakeParry Sound	16 of 19	2014	12	2.17
13	Gloucester PoolMuskoka	41 of 55	2014	27	13
14	White LakeRenfrew	34 of 46	2014	9	23.8
15	Shelden LakeAlgoma	25 of 33	2013	21	1.44
16	Mink LakeRenfrew	14 of 17	2010	12	5.53
17	Elbow LakeFrontenac	13 of 16	2012	9	1.29
18	McDonald LakeCochrane	5 of 5	2019		0.12
19	Pecors LakeAlgoma	5 of 5	2012	28	3.5
20	Island LakeDufferin	102 of 161	2018		1.62
21	Britain LakeBruce	10 of 12	1973		1.14
22	Crowe LakeHastings	30 of 43	2014	15	10.4
23	St. George LakeYork	12 of 15	1995		0.1
24	McKenzie LakeNipissing	14 of 18	2009	27	3.12
25	Sparrow LakeMuskoka	30 of 44	2014	12	11.2
26	Miller LakeBruce	22 of 32	2012	6	3.17
27	Minnow LakeGreater Sudbury / Grand Sudbury	4 of 4			0.21
28	Lake TemagamiNipissing	68 of 113	2018	73	240
29	Cordova LakePeterborough	21 of 31	2015	12	2.69
30	Four Mile LakeKawartha Lakes	15 of 21	2009	18	7.56
31	Ahmic LakeParry Sound	29 of 45	2014	24	16.6
32	Constance LakeAlgoma	10 of 13	2010	15	1.19
33	Long LakeSimcoe	13 of 18	2012	12	4.16
34	Fairy LakeHalton	32 of 51	2011		0.25
35	Kennisis LakeHaliburton	20 of 30	2010	73	15
36	Lake MuskokaMuskoka	73 of 130	2019		122
37	Black Donald LakeRenfrew	20 of 31	2009	43	30.6
38	Farren LakeLanark	12 of 17	2010	21	1.76
39	Belmont LakePeterborough	29 of 48	2014	16	7.85
40	Kamaniskeg LakeHastings	40 of 70	2014	40	22.1
41	Lake RosseauMuskoka	32 of 55	2021	89	65.7
42	Little Chiblow LakeAlgoma	33 of 57	2013	37	6.59
43	Quirke LakeAlgoma	53 of 97	2016	102	20.7
44	Mississagua LakePeterborough	17 of 27	2013	44	7.2
45	Anima Nipissing LakeTimiskaming	48 of 88	2014	73	20.6
46	Lake ManitouManitoulin	33 of 58	2011	49	106
47	Brule LakeFrontenac	18 of 29	2010	55	5.81
48	Spiers LakeMuskoka	3 of 3	2007		3.19
49	Louise LakeGrey	3 of 3	1983		0.36
50	Third Depot LakeFrontenac	3 of 3			0.87

Top 50 of 532 lakes. Download the full list (CSV). Source: Ontario’s Aquatic Resource Area survey summaries and fish stocking records (Ministry of Natural Resources, OGL-Ontario). Data as of October 9, 2026. A record means a survey caught or observed the species, not that it is abundant today.

Rock Bass Lakes in Ontario

Where it is found

Where rock bass is most consistently recorded

Other fish in Ontario