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Table 1

Number of early germinal vesicle migration (EGVM) and hydrated (HYD) female Atlantic horse mackerels, Trachurus trachurus, sampled per hour in 2010 and 2013. The total length (TL) range is shown in brackets.

Time of day 2010 2013

             EGVM   HYD   HYD
00:00–1:00 3* (21–22 cm)
7:00−8:00 3 (23–26 cm) 5 (24–28 cm)
8:00−9:00 8 (24–34 cm) 9 (23–30 cm) 3 (29–31 cm)
9:00−10:00 3 (29–32 cm) 2 (30–31 cm) 4 (28–32 cm)
11:00−12:00 3 (22–25 cm) 18 (21–28 cm) 1 (25–26 cm)
12:00−13:00 2 (27–28 cm) 0
13:00−14:00 7 (22–28 cm) 2 (23–24 cm) 2 (25–37 cm)
14:00−15:00 16 (20–36 cm) 15 (21–29 cm)
15:00−16:00 1 (25–26 cm) 0 8 (30–34 cm)
16:00−17:00 14 (21–34 cm) 0 2 (27–31 cm)
17:00−18:00 6 (31–34 cm) 2 (27–32 cm) 2 (30–33 cm)
Total 63 (20–36 cm) 53 (21–32 cm) 25 (21–37 cm)
*

Two out of three HYD individuals sampled between 00:00–01:00 in 2013 were at the germinal vesicle break down stage, but for analysis purposes were merged with the HYD stage.

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