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<p class=MsoNormal>The sun is finally back and a harmful “bloom”
(or better, “event”) of <i>Chaetoceros convolutus</i> is occurring
today in central Puget Sound where sampled near Bainbridge Island, especially
in Port Blakely. Kevin Bright reports concentrations up to 30 cells/ml
(30,000 cells/liter) which is more than sufficient to kill wild or farmed fish
after some exposure period, but so far there are no reports of either. The
extent of <i>C. convolutus</i> events are very difficult to measure, as the
concentrations do not produce obvious changes in water clarity or water quality
parameters like D.O. or pH. Harmful <i>Chaetoceros </i>are more harmful
if the chains are longer as apparently they wedge more efficiently among the
gill lamellae. Harmful <i>Chaetoceros</i> cells are often mixed to many
tens of meters depth in Puget Sound, such as occurs periodically in North Hood
Canal but not necessarily Dabob Bay where surface blooms of very high density
have been recorded. The first recorded fish mortalities with this species
were with ling cod in British Columbia held in pens, but the Strait of Georgia
is much more vertically stratified than most of Puget Sound due to the Fraser
Rv. discharge. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>Heterosigma</i> blooms were reported again last Friday along
the west coast of Bainbridge Island during an fixed wing aircraft survey by
Megan Black, and we were told that it stretched across the sound toward
Seattle. Sampling by Liz Tobin at Brownsville Marina ( western side
of the channel Bainbridge Island to Kitsap Peninsula channel) the prior day yielded
no cells of the alga but a mixed community of mostly dinoflagellates, some
small flagellates and a just few diatoms<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>With the sudden hot weather this week, expect the unexpected
and please post your observations or results to SoundHABs. Tides become
larger near the end of the week, which may help a bit. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I don’t mind transcribing reports, but better to have
them first hand, so please share your observations. (!)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>All prior postings are available in a SoundHAB archive system
that may help HAB scientist begin to understand bloom dynamics in our area.
Otherwise, there are few records. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If you want to see a real functioning HAB monitoring system,
subscribe to the California <a href="mailto:habs@sccwrp.org">habs@sccwrp.org</a>
system. They are building an amazing database with quantitative postings almost
every day from a large area of the coastline. However, they don’t differentiate
Chaetoceros into fish killers, subgenus Phaeoceros vs. non fish killers, Hyalochaete
types, which is not difficult but useful. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Jack<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>J.E. Jack Rensel Ph.D.<o:p></o:p></p>
<p class=MsoNormal>Rensel Associates Aquatic Sciences<o:p></o:p></p>
<p class=MsoNormal>cell: 360-631-6538<o:p></o:p></p>
<p class=MsoNormal>jackrensel@att.net<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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