Baked Bean Ascidian
- Peak month
- September
- Records since 2000
- 8,072
- Scientific name
- Dendrodoa grossularia
Light Bulb Tunicate
- Peak month
- June
- Records since 2000
- 7,424
- Scientific name
- Clavelina lepadiformis
Star Ascidian, Star tunicate, Golden star sea-squirt
- Peak month
- August
- Records since 2000
- 6,456
- Scientific name
- Botryllus schlosseri
Dirty Sea-squirt
- Peak month
- September
- Records since 2000
- 5,013
- Scientific name
- Ascidiella aspersa
Yellow sea-squirt, Tube sea-squirt, Sea vase
- Peak month
- June
- Records since 2000
- 4,422
- Scientific name
- Ciona intestinalis
Ascidia mentula
- Peak month
- August
- Records since 2000
- 3,939
- Group
- Sea squirts
Colonial Seasquirt
- Peak month
- July
- Records since 2000
- 2,785
- Scientific name
- Morchellium argus
Aplidium punctum
- Peak month
- June
- Records since 2000
- 2,619
- Group
- Sea squirts
Diplosoma spongiforme
- Peak month
- August
- Records since 2000
- 2,224
- Group
- Sea squirts
Gas Mantle Ascidian
- Peak month
- September
- Records since 2000
- 1,998
- Scientific name
- Corella parallelogramma
Hairy sea-squirt
- Peak month
- September
- Records since 2000
- 1,872
- Scientific name
- Ascidiella scabra
Neptune's Heart Sea Squirt
- Peak month
- July
- Records since 2000
- 1,825
- Scientific name
- Phallusia mammillata
Lissoclinum perforatum
- Peak month
- September
- Records since 2000
- 1,798
- Group
- Sea squirts
Didemnum maculosum
- Peak month
- August
- Records since 2000
- 1,713
- Group
- Sea squirts
Orange Sea Grapes
- Peak month
- July
- Records since 2000
- 1,707
- Scientific name
- Stolonica socialis
Ascidia virginea
- Peak month
- August
- Records since 2000
- 1,669
- Group
- Sea squirts
Ascidian
- Peak month
- July
- Records since 2000
- 1,550
- Scientific name
- Styela clava
Botrylloid
- Peak month
- September
- Records since 2000
- 1,358
- Scientific name
- Botrylloides leachii
Orange-tipped sea squirt
- Peak month
- July
- Records since 2000
- 1,182
- Scientific name
- Corella eumyota
Polycarpa pomaria
- Peak month
- June
- Records since 2000
- 1,094
- Group
- Sea squirts
Pyura tessellata
- Peak month
- September
- Records since 2000
- 1,017
- Group
- Sea squirts
Compound sea squirt
- Peak month
- September
- Records since 2000
- 958
- Scientific name
- Diplosoma listerianum
Aplidium turbinatum
- Peak month
- July
- Records since 2000
- 955
- Group
- Sea squirts
Polycarpa scuba
- Peak month
- July
- Records since 2000
- 952
- Group
- Sea squirts
Football Ascidian
- Peak month
- July
- Records since 2000
- 827
- Scientific name
- Diazona violacea
Dwarf Ascidian
- Peak month
- September
- Records since 2000
- 753
- Scientific name
- Perophora listeri
Polyclinum aurantium
- Peak month
- July
- Records since 2000
- 746
- Group
- Sea squirts
Pyura microcosmus
- Peak month
- September
- Records since 2000
- 704
- Also known as
- a sea squirt
Polycarpa fibrosa
- Peak month
- June
- Records since 2000
- 674
- Group
- Sea squirts
Ascidia conchilega
- Peak month
- August
- Records since 2000
- 659
- Group
- Sea squirts
Sea Grapes, Molgula, Sea squirts
- Peak month
- September
- Records since 2000
- 636
- Scientific name
- Molgula manhattensis
Orange lights seasquirt
- Peak month
- June
- Records since 2000
- 527
- Scientific name
- Pycnoclavella aurilucens
Sea Strawberry
- Peak month
- September
- Records since 2000
- 518
- Scientific name
- Aplidium elegans
Lesser Gooseberry Sea Squirt
- Peak month
- September
- Records since 2000
- 511
- Scientific name
- Distomus variolosus
Aplidium nordmanni
- Peak month
- July
- Records since 2000
- 443
- Group
- Sea squirts
Distaplia rosea
- Peak month
- July
- Records since 2000
- 436
- Group
- Sea squirts
Perophora japonica
- Peak month
- July
- Records since 2000
- 403
- Group
- Sea squirts
Archidistoma aggregatum
- Peak month
- June
- Records since 2000
- 310
- Group
- Sea squirts
Botrylloides diegensis
- Peak month
- July
- Records since 2000
- 302
- Group
- Sea squirts
Trididemnum cereum
- Peak month
- September
- Records since 2000
- 260
- Group
- Sea squirts
Pin head sea squirt
- Peak month
- July
- Records since 2000
- 257
- Scientific name
- Pycnoclavella stolonialis
Didemnum vexillum
- Peak month
- April
- Records since 2000
- 244
- Group
- Sea squirts
Botrylloides violaceus
- Peak month
- July
- Records since 2000
- 243
- Group
- Sea squirts
Asterocarpa humilis
- Peak month
- September
- Records since 2000
- 224
- Group
- Sea squirts
Molgula complanata
- Peak month
- August
- Records since 2000
- 215
- Group
- Sea squirts
Polysyncraton bilobatum
- Peak month
- September
- Records since 2000
- 186
- Group
- Sea squirts
Pyura squamulosa
- Peak month
- June
- Records since 2000
- 186
- Group
- Sea squirts
Synoicum incrustatum
- Peak month
- May
- Records since 2000
- 186
- Group
- Sea squirts