Young Allis Shad Alosa alosa (Clupeidae) Would Not Be Euryphagous: An Assessment of Juvenile Diet and Prey Selectivity under Riverine-Type Conditions

Table 1

Biometrics (TL and fresh weight), Fulton’s K condition index (mean ± SD), and vacuity rate of Alosa alosa captured in the rearing artificial rivers R1 and R2 at one and two months old in 2018 and 2019, with the corresponding number of individuals captured.

Age	One month old			Two months old
Years	2018	2019		2018	2019
Rivers	R1	R1	R2	R1	R1	R2
Number of individuals	25	30	30	25	31	30
Total length TL (mm)	23.49 ± 1.53	22.76 ± 1.73	16.83 ± 2.37	44.25 ± 2.41	34.04 ± 3.78	22.33 ± 4.15
Weight (g)	0.06 ± 0.02	0.04 ± 0.02	0.01 ± 0.01	0.52 ± 0.09	0.21 ± 0.08	0.08 ± 0.08
Fulton’s K	0.47 ± 0.09	0.34 ± 0.06	0.29 ± 0.08	0.59 ± 0.05	0.50 ± 0.05	0.62 ± 0.14
Vacuity rate (%)	12	56.7	73.3	0	0	73.3

Note that the data from R2 will be excluded from the further analysis of prey selectivity because of the very low growth of the fish and the high vacuity rate of the stomachs.