Santa Cruz Wharf
Wednesday, August 13, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Common
– Alexandrium: Rare
– Dinophysis: Common
– Margalefidinium: Rare
* Impressions *
Another cool and overcast morning at the wharf. Phytoplankton biomass was similar to last week and the assemblage remains a mix of diatoms and dinoflagellates. Dinophysis and Pseudo-nitzschia were the most abundant. Both size classes of Pseudo-nitzschia were observed this week. No P. multiseries were detected, but there were P. australis and Alexandrium counts increased again this week.
Dinoflagellates:
C: Dinophysis
C: Prorocentrum
P: Akashiwo
P: Ceratium
P: Protoperidinium
R: Alexandrium
R: Margalefidinium
R: Polykrikos
R: Boreadinium
R: Oxyphysis
R: Gymnodinium
R: Noctiluca
Diatoms:
C: Pseudo-nitzschia
P: Eucampia
P: Guinardia
R: Chaetoceros
R: Ditylum
R: Thalassionema
R: Lauderia
R: Detonula
R: Dactyliosolen
R: Rhizosolenia
R: Stephanopyxis
R: Thalassiothrix
R: Coscinodiscus
R: Licmophora
R: Asteromphalus
Other:
R: Phaeocystis
* Environmental Information *
Time: 8:45 am
Collector: M. Conci
Water Conditions (SCW)
Water Temperature: 15.7 C
Water Conditions: Calm
Water Color/Code: Green, 10GY 2/4 (#30)
Water Visibility: 6 ft
Tide: Falling, Low – 7:32, 0.8 ft
Surf Report: SW swell, 4-6 ft
NDBC buoy 46236
– Significant wave height: 0.9 m
– Swell height/direction: 0.7 m, SW
– Wind wave height/direction: 0.7 m, WNW
Weather Conditions (KudelaHawk)
Sky: Overcast
Air Temperature: 57.6 F (14.2 C)
Wind: 1 mph, N
Solar radiation: 107 watts/m^2
Monterey Wharf II
Wednesday, August 13, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Common
– Alexandrium: Rare
– Dinophysis: Present
– Margalefidinium: Rare
* Impressions *
This morning, conditions were cloudy and misting. The water surface was calm with a slight breeze. The water appeared more green than last week, with a visibility of 3.5 m. Diatoms dominated the water column. Phytoplankton biomass increased from last week. Pseudo-nitzschia and Chaetoceros were common (10 – 49%). Prorocentrum, Guinardia, Ditylum, Eucampia, Dinophysis, Akashiwo sanguinea, and Protoperidinium were present (1 – 9%). The HAB species that were observed in the water this morning included Pseudo-nitzschia, Alexandrium, Dinophysis, Cochlodinium, and Akashiwo sanguinea.
Dinoflagellates:
P: Akashiwo sanguinea
P: Prorocentrum spp.
P: Dinophysis spp.
R: Ceratium spp.
R: Gonyaulax spinifera
P: Protoperidinium spp.
R: Alexandrium spp.
R: Gyrodinium spp. (pink tipped)
R: Polykrikos spp.
R: Cochlodinium spp.
R: Oxyphysis
R: Pyrophacus spp.
R: Amylax
Diatoms:
C: Chaetoceros spp.
R: Thalassiosira spp.
R: Coscinodiscus spp.
C: Pseudo-nitzschia spp.
P: Ditylum spp.
P: Guinardia spp.
R: Pleurosigma spp.
R: Thalassionema spp.
R: Skeletonema spp.
R: Tropidoneis spp.
R: Lauderia spp.
R: Navicula spp.
R: Cylindrotheca spp.
R: Licmophora spp.
R: Leptocylindrus spp.
R: Asterionellopsis spp.
R: Dactyliosolen spp.
R: Proboscia spp.
R: Detonula spp.
P: Eucampia
R: Lioloma
R: Actinoptuchus
Zooplankton:
R: fecal pellets, nauplii, tintinnids, calanoids, fish larvae, eggs
R: Oligiotrich
* Environmental Information *
TIME: 0733 PT
COLLECTOR: Hannah McGrath
Water Temperature: 15.4°C
Water Conditions: calm surface
Water Color: 10GY 2/4
Visibility: 3.5 m
Tide: Falling, 0.26 m, low at 0743h
Sky: cloudy/misting, 100% cloud
Air Temperature: 13.89°C
Wind: offline, 1.79m/S
Rare (R): <1% ~~~ Present (P): 1 – 9% ~~~ Common (C): 10 – 49% ~~~ Abundant (A): >= 50%