TABLE 1.

Environmental parameters at the Leixões Port for each of the sampled days.

Parameters spring	Day 1	Day 2	Day 4	Day 7	Day 10	Day 14	Day 21	Day 25	Day 30
pH	7.31	7.52	7.51	7.67	7.21	7.56	7.21	7.09	7.21
Temperature (°C)	16.1	16.5	16.6	17.5	17.5	18.2	18.6	16.3	16.5
PSU	31.1	31.2	29.6	29.8	32.5	30.9	31.5	29.7	30.2
Daylength (hours: minutes)	14:46	14:47	14:50	14:54	14:59	15:02	15:07	15:08	15:08
Parameters Winter	Day 1	Day 2	Day 4	Day 7	Day 10	Day 14	Day 21	Day 25	Day 30
pH	7.65	7.87	7.91	7.92	7.91	7.94	7.92	7.91	7.85
Temperature (°C)	13.3	13.6	13.6	13.3	14.0	13.5	13.9	13.9	13.5
PSU	30.7	31.3	33.3	32.5	33.0	32.9	29.3	31.7	32.1
Daylength (hours: minutes)	10:19	10:22	10:27	10:34	10:42	10:52	11:11	11:22	11:35