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Region: PAC

Geographic Zones: Twin Rocks

Survey Types: Fish Only, Invertebrates Only, Fish & Invertebrates

Dates: 1/1/93 - 11/3/24

Total Surveys: 22

#Species Reported: 62

Average Species Reported on a Survey by Expert Surveyors: 15.67

Average Species Reported on a Survey by Novice Surveyors: 15.37

Survey Type: FO = Fish Only; IO = Invertebrates Only; FI = Fish & Invertebrates - How to interpret REEF data?
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Click a column header to sort by that column. Hold shift and click to sort by multiple columns

SurveysBottom Time
ExpertNovice
CodeNameFOIOFIFOIOFI(H:M)
4California102140517:03
42SOUTHERN CALIFORNIA102140517:03
4203Southern Channel Islands102140517:03
420302Catalina Island102140517:03
42030233Twin Rocks102140517:03
TOTALS102140517:03

Species

%SF = Sighting Frequency; DEN = Density Score - How to interpret REEF data?
Bar length corresponds to sighting frequency
Color saturation corresponds to density score
Click + to display species image and additional information.
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California Sheephead - Wrasse
(Bodianus pulcher)
SF: 95.45% | DEN: 2.81
Garibaldi - Damselfish
(Hypsypops rubicundus)
SF: 95.45% | DEN: 2.43
Kelp Bass - Sea Bass
(Paralabrax clathratus)
SF: 95.45% | DEN: 3.05
Senorita - Wrasse
(Oxyjulis californica)
SF: 95.45% | DEN: 3.62
Rock Wrasse - Wrasse
(Halichoeres semicinctus)
SF: 90.91% | DEN: 3.05
Blackeye Goby - Goby
(Rhinogobiops nicholsii)
SF: 81.82% | DEN: 2.67
Blacksmith - Damselfish
(Chromis punctipinnis)
SF: 81.82% | DEN: 3.61
Wavy Turban Snail - Mollusks
(Lithopoma undosum)
SF: 71.43% | DEN: 3.2
Bluebanded Goby - Goby
(Lythrypnus dalli)
SF: 68.18% | DEN: 2.6
Halfmoon - Sea Chub
(Medialuna californiensis)
SF: 63.64% | DEN: 2.07
Black Perch - Surfperch
(Embiotoca jacksoni)
SF: 59.09% | DEN: 1.85
Kelp Perch - Surfperch
(Brachyistius frenatus)
SF: 59.09% | DEN: 3.08
Opaleye - Sea Chub
(Girella nigricans)
SF: 59.09% | DEN: 2
Giant Kelp - Algae
(Macrocystis integrifolia / pyrifera)
SF: 57.14% | DEN: 3.75
Green Abalone - Mollusks
(Haliotis fulgens)
SF: 57.14% | DEN: 1.75
Giant Sea Bass - Wreckfish
(Stereolepis gigas)
SF: 54.55% | DEN: 2
California Golden Gorgonian - Cnidarians
(Muricea californica)
SF: 42.86% | DEN: 2
Crowned Urchin - Echinoderms
(Centrostphanus coronatus)
SF: 42.86% | DEN: 2.67
Red Rock Shrimp - Arthropods
(Lysmata californica)
SF: 42.86% | DEN: 2
Tube-dwelling Anemone - Cnidarians
(Pachycerianthus fimbriatus)
SF: 42.86% | DEN: 2.33
Pile Perch - Surfperch
(Rhacochilus vacca)
SF: 40.91% | DEN: 1.78
Giant Spined Star - Echinoderms
(Pisaster giganteus)
SF: 28.57% | DEN: 2
Masking/Sheep Crab - Arthropods
(Loxorthynchus crispatus (L. grandis))
SF: 28.57% | DEN: 1
Southern Sea Palm - Algae
(Eisenia arborea)
SF: 28.57% | DEN: 2.5
Spiny Lobster - Arthropods
(Panulirus interruptus)
SF: 28.57% | DEN: 2.5
Warty Sea Cucumber - Echinoderms
(Parastichopus parvimensis)
SF: 28.57% | DEN: 2
Bat Ray - Eagle Ray
(Myliobatis californica)
SF: 27.27% | DEN: 1.17
California Scorpionfish - Scorpionfish
(Scorpaena guttata)
SF: 27.27% | DEN: 1.17
Rubberlip Seaperch - Surfperch
(Rhacochilus toxotes)
SF: 27.27% | DEN: 1.33
Topsmelt - Silverside
(Atherinops affinis)
SF: 27.27% | DEN: 3.33
C-O Sole - Righteye Flounder
(Pleuronichthys coenosus)
SF: 22.73% | DEN: 1.6
Giant Kelpfish - Clinid
(Heterostichus rostratus)
SF: 18.18% | DEN: 1.75
Pacific Sardine - Herring
(Sardinops sagax)
SF: 18.18% | DEN: 4
Brown Gorgonian - Cnidarians
(Muricea fruticosa)
SF: 14.29% | DEN: 2
California Sea Cucumber - Echinoderms
(Parastichopus californicus)
SF: 14.29% | DEN: 2
Christmas Tree Worm - Annelids
(Spirobranchus spinosus)
SF: 14.29% | DEN: 3
Cobalt Sponge - Poriferans
(Hymenamphiastra cyanocrypta)
SF: 14.29% | DEN: 0
Oarweed - Algae
(Laminaria farlowii)
SF: 14.29% | DEN: 3
Pink Abalone - Mollusks
(Haliotis corrugata)
SF: 14.29% | DEN: 1
Purple Urchin - Echinoderms
(Strongylocentrotus purpuratus)
SF: 14.29% | DEN: 2
Red Gorgonian - Cnidarians
(Leptogorgia chilensis)
SF: 14.29% | DEN: 1
Red Sea Urchin - Echinoderms
(Mesocentrotus franciscanus)
SF: 14.29% | DEN: 3
Southern Staghorn Bryozoan - Bryozoans
(Diaperoforma californica)
SF: 14.29% | DEN: 3
Strawberry Anemone - Cnidarians
(Corynactis californica)
SF: 14.29% | DEN: 1
Two-spot Octopus - Mollusks
(Octopus bimaculatus)
SF: 14.29% | DEN: 2
Kelp Rockfish - Scorpionfish
(Sebastes atrovirens)
SF: 13.64% | DEN: 2.33
Tubesnout - Tubesnout
(Aulorhynchus flavidus)
SF: 13.64% | DEN: 3
Angel Shark - Angel Shark
(Squatina californica)
SF: 9.09% | DEN: 1
California Moray - Moray
(Gymnothorax mordax)
SF: 9.09% | DEN: 1
Island Kelpfish - Labrisomids
(Alloclinus holderi)
SF: 9.09% | DEN: 1.5
Painted Greenling - Greenling
(Oxylebius pictus)
SF: 9.09% | DEN: 1
Sargo - Grunt
(Anisotremus davidsoni)
SF: 9.09% | DEN: 1.5
Black Rockfish - Scorpionfish
(Sebastes melanops)
SF: 4.55% | DEN: 3
Cabezon - Sculpin
(Scorpaenichthys marmoratus)
SF: 4.55% | DEN: 1
Horn Shark - Bullhead Shark
(Heterodontus francisci)
SF: 4.55% | DEN: 1
Jack Mackerel - Jack
(Trachurus symmetricus)
SF: 4.55% | DEN: 4
Jacksmelt - Silverside
(Atherinops californiensis)
SF: 4.55% | DEN: 3
Juvenile (YOY) Rockfish - Unidentified - Scorpionfish
(Sebastes sp. (YOY))
SF: 4.55% | DEN: 3
Olive Rockfish - Scorpionfish
(Sebastes serranoides)
SF: 4.55% | DEN: 2
Scalyhead Sculpin - Sculpin
(Artedius harringtoni)
SF: 4.55% | DEN: 1
Silversides spp. - Silverside
(Atherinidae spp.)
SF: 4.55% | DEN: 4
Striped Seaperch - Surfperch
(Embiotoca lateralis)
SF: 4.55% | DEN: 3