Santa Cruz Wharf
Wednesday, August 27, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Rare
– Alexandrium: Rare
– Dinophysis: Common
– Margalefidinium: Rare
* Impressions *
Overcast and cool at the wharf this morning. Water temp decreased 2C this week and the net tow was mostly dinoflagellates. Phytoplankton biomass increased and Prorocentrum was the most abundant. Pseudo-nitzschia were mostly delicatissima-size with a few seriata-size chains in the mix, but no P. australis or P. multiseries were detected. Alexandrium counts increase slightly this week.
Dinoflagellates:
C: Prorocentrum
C: Dinophysis
C: Ceratium
P: Protoperidinium
R: Akashiwo
R: Margalefidinium
R: Alexandrium
R: Polykrikos
R: Boreadinium
R: LRB
R: Oxyphysis
R: Gymnodinium
R: Gonyaulax
Diatoms:
R: Pseudo-nitzschia
R: Proboscia
R: Eucampia
R: Guinardia
R: Chaetoceros
R: Ditylum
R: Thalassiosira
R: Rhizosolenia
R: Thalassionema
R: Dactyliosolen
R: Pleurosigma
R: Entomoneis
R: Coscinodiscus
R: Licmophora
R: Asteromphalus
Other:
R: Dictyocha
R: Phaeocystis
* Environmental Information *
Time: 9:00 am
Collector: M. Conci
Water Conditions (SCW)
Water Temperature: 15.4 C
Water Conditions: Calm
Water Color/Code: Dark green, 5G 2/6 (#31)
Water Visibility: 7 ft
Tide: Rising, Low – 7:09, 1.6 ft
Surf Report: NW swell, 2-3 ft
NDBC buoy 46236
– Significant wave height: 0.7 m
– Swell height/direction: 0.3 m, SW
– Wind wave height/direction: 0.6 m, WNW
Weather Conditions (KudelaHawk)
Sky: Overcast
Air Temperature: 62.4 F (16.9 C)
Wind: 4 mph, W
Solar radiation: 199 watts/m^2
Monterey Wharf II
Wednesday, August 27, 2025
* Quick HAB Observations *
– Pseudo-nitzschia: Common
– Alexandrium: Rare
– Dinophysis: Rare
– Margalefidinium: Rare
* Impressions *
This morning, conditions were cloudy. The water surface was calm with a slight/to no breeze. The water appeared less yellow/green than last week, with a visibility of 5.0 m. Diatoms dominated the water column. Pseudo-nitzschia and Chaetoceros were common (10 – 49%). Eucampia, Akashiwo sanguinea, Cylindrotheca, Prorocentrum, 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:
R: Akashiwo sanguinea
P: Prorocentrum spp.
R: Dinophysis spp.
R: Ceratium spp.
P: Protoperidinium spp.
R: Alexandrium spp.
R: Scrippsiella 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.
R: Ditylum spp.
R: Guinardia spp.
R: Pleurosigma spp.
R: Rhizosolenia spp.
R: Thalassionema spp.
R: Skeletonema spp.
R: Hemiaulus spp.
R: Tropidoneis spp.
R: Lauderia spp.
R: Navicula spp.
P: Cylindrotheca spp.
R: Odontella spp.
R: Asteromphalus spp.
R: Asterionellopsis spp.
R: Dactyliosolen spp.
P: Eucampia
R: Lioloma
Others:
R: Dictyocha spp.
Zooplankton:
R: fecal pellets, nauplii, tintinnids, calanoids, fish larvae, eggs
R: Oligiotrich
* Environmental Information *
TIME: 0736 PT
COLLECTOR: Hannah McGrath
Water Temperature: 14.0°C
Water Conditions: calm
Water Color: 5GY 2/2
Visibility: 5.0 m
Tide: Rising, 0.49 m, high at 1348 h
Sky: cloudy, 100% cloud
Air Temperature: 15.00°C
Wind: offline, 0.89m/S
Rare (R): <1% ~~~ Present (P): 1 – 9% ~~~ Common (C): 10 – 49% ~~~ Abundant (A): >= 50%