Geoduck seed maintenance @ Manchester

Hollie pulled the geoduck seed up from the dock at Manchester, removed them from the buckets, and put them back in the OA system (see Geoduck Refresher). I’ve been helping to maintain the seed once a week or so via taking water quality measurements, algae concentrations, and feeding:

August 3rd

I added 5gal of CM & 609; density was relatively low in each, so I did not dilute the algae with seawater.

Water quality measurements: water sampled and capped from bins 1-6 and measured T, S & pH simultaneously for each sample, beginning with bin #1. Then, repeated with bins 7-12

1: 19.01C/28.5 sal/-62.5mv
2: 18.69C/28.6sal/-61.9mv
3: 18.93C/28.7sal/-61.7mv
4: 19.37C/28.6sal/-61.3mv
5: 19.19C/28.5sal/-61.5mv
6: 19.65C/28.8sal/-61.5mv
7: 19.24C/28.5sal/-40.3mv
8: 19.16C/28.6sal/-39.0mv
9: 19.11C/28.5sal/-38.9mv
10: 19.38C/28.7sal/-38.3mv
11: 19.43C/28.6sal/-38.9mv
12: 19.27C/28.6sal/-38.1mv

Algae concentrations in bins, cells/mL: duplicate coulter counter readings of same sample; samples were shaken mix prior to readings
1: 6,219/6,140
2: 9,211/10,447
3: 6,843/6,756
4: 6,851/7,030
5: 7,237/7,173
6: 7,904/7,741
7: 10,160/10,005
8: 5,651/5,850
9: 7,439/5,997
10: 4,753/4,800
11:  10,171/10,013
12: 8,121/7,997

August 10th

Water quality measurements: same process as 8/3

1: 18.86C/28.7 sal/-59.8mv
2: 18.56/28.6/-60.3
3: 18.65/28.7/-60.2
4: 18.89/28.7/-59.6
5: 18.71/28.7/-59.8
6: 18.93/28.7/-60.1
7: 18.89/28.7/-38.3
8: 18.85/28.7/-37.5
9: 18.94/28.7/-36.7
10: 19.38/28.8/-35.5
11: 19.05/28.7/-37.1
12: 19.16/28.8/-36.8

August 11th:

I cleaned the algae header today, but had to put the 10gal of remaining algae back in there because there was such a short supply of dense algae in the hatchery. I added 5 gal of 609, but no more diatoms were available to add to the tank.

Algae concentrations in inflowing water (multiple readings of same sample):

Blank: 402 cells/ml / 361
SW: 821 / 849
1: 42,316 / 38,883 / 38,786
2: 35,226 / 35,409 / 35,315
3: 36,533 / 36,857 /36,993
4: 42,129 /38,314 / 38,205
5: 38,747 / 38,708 / 38,519
6: 38,052 / 36,337 / 36,456
7: 32,370 / 32,431 / 32,362
8: 32,498 / 31,401 / 32,202
9: 29,256 / 31,952 / 29,240
10: 31,281 / 30,853 / 31,296
11: 31,520 / 31,363 / 31,551
12: 31,452 / 31,113 / 31,085