Isthmus Reef
★★★★☆
(1,297)
Isthmus Reef is a popular dive site on Catalina Island reachable only by boat. It’s a great site for open water students and newer divers due to its sheltered location and shallow depth.
There is an abundance of kelp fish species including garibaldi, sheepshead, senorita wrasse, and kelpfish. There are also plenty of sea urchins, sea stars, and gobies.
Dive Activity & Environmental Conditions
Top Wildlife Sightings
Most frequently spotted marine life based on dive logs
#1
Garibaldi Damselfish
183
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#2
Spiny Lobster
74
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#3
Lobster
40
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#4
Grouper/Basslets
24
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#5
Sea Lion
13
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#6
Octopus
4
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#7
Seal
3
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
#8
Stingrays
3
Total Sightings
J
F
M
A
M
J
J
A
S
O
N
D
