Santa Cruz Wharf
Wednesday, April 23, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Present
– Alexandrium: Rare
– Dinophysis: None
– Margalefidinium: None
* Impressions *
It was a cool and overcast morning at the wharf. Phytoplankton biomass decreased from last week along with a decrease in dinoflagellate abundance. Net tow was mostly diatoms and Skeletonema was the most abundant this week. Pseudo-nitzschia decreased in abundance this week and the P. australis counts dropped an order of magnitude. The Alexandrium concentration decreased as well.
Dinoflagellates:
R: Akashiwo
R: Protoperidinium
R: Alexandrium
R: Ceratium
R: Prorocentrum
R: Gymnodinium
R: Noctiluca
R: Polykrikos
R: Boreadinium
R: Amylax
Diatoms:
A: Skeletonema
P: Pseudo-nitzschia
P: Eucampia
P: Thalassiosira
P: Thalassionema
R: Chaetoceros
R: Guinardia
R: Detonula
R: Lauderia
R: Asterionellopsis
R: Pleurosigma
R: Asteromphalus
R: Ditylum
R: Licmophora
R: Paralia
R: Rhizosolenia
R: Coscinodiscus
R: Tropidoneis
R: Entomoneis
* Environmental Information *
Time: 8:30 am
Collector: M. Conci
Water Conditions (SCW)
Water Temperature: 12.7 C
Water Conditions: Calm
Water Color/Code: Green, 10GY 3/4 (#29)
Water Visibility: 5 ft
Tide: Falling, High – 7:02, 4.2 ft
Surf Report: NW swell, 4-5
NDBC buoy 46236
– Significant wave height: 1.8 m
– Swell height/direction: 0.8 m, WNW
– Wind wave height/direction: 1.7 m, WNW
Weather Conditions (KudelaHawk)
Sky: Overcast
Air Temperature: 51.4 F (10.8 C)
Wind: 1 mph, SSW
Solar radiation: 138 watts/m^2
Monterey Wharf II
Wednesday, April 23, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Common
– Alexandrium: Rare
– Dinophysis: Rare
– Margalefidinium: None
* Impressions *
The wharf this morning was chilly and cloudy with a slight drizzle. The surface of the water was relatively calm and covered with melting ice from a truck unloading fish. There were lots of birds. The water this week was more blue than last week with a visibility > 5.0m. Diatoms dominated the water column. Chaetoceros, Skeletonema, Thalassiosira, and Pseudo-nitzschia were common (10-49%). Thalassionema and Asterionellopsis were present (1-9%) The HAB species that were observed in the water this morning included Pseudo-nitzschia, Dinophysis and Akashiwo sanguinea.
Dinoflagellates:
R: Akashiwo sanguinea
R: Dinophysis spp.
R: Ceratium spp.
R: Gonyaulax spinifera
R: Protoperidinium spp.
R: Alexandrium spp.
R: Gyrodinium spp. (pink tipped)
R: Polykrikos spp.
R: Pyrophacus spp.
R: Amylax
Diatoms:
C: Chaetoceros spp.
C: Thalassiosira spp.
R: Coscinodiscus spp.
C: Pseudo-nitzschia spp.
R: Ditylum spp.
R: Guinardia spp.
R: Pleurosigma spp.
R: Rhizosolenia spp.
P: Thalassionema spp.
C: Skeletonema spp.
R: Tropidoneis spp.
R: Lauderia spp.
R: Navicula spp.
R: Cylindrotheca spp.
P: Asterionellopsis spp.
R: Stephanopyxis spp.
R: Detonula spp.
R: Eucampia
R: Entomoneis
Others:
R: Dictyocha spp.
Zooplankton:
R: fecal pellets, nauplii, tintinnids, calanoids, fish larvae, eggs
R: oligiotrich
* Environmental Information *
TIME: 0822 PT
COLLECTOR: Hannah McGrath
Water Temperature: 13.0°C
Water Conditions: calm
Water Color: 5G 2/6
Visibility: > 5.0 m
Tide: Falling, 1.31m, low at 1355 h
Sky: cloudy/dark, 100% cloud
Air Temperature: 11.11°C
Wind: offline, 3.58 m/S
Rare (R): <1% ~~~ Present (P): 1 – 9% ~~~ Common (C): 10 – 49% ~~~ Abundant (A): >= 50%