1. Spawn of J. hyalinus. Length of mass 10mm. Spawn laid in May in refrigerator at 9° C, three weeks after adult collected on Menai Strait in April 2011. Each white ovoid contains many ova.
2. Spawn of J. hyalinus. Length of mass 10mm. Spawn laid in May in refrigerator at 9° C, three weeks after adult collected on Menai Strait in April 2011. Each white ovoid contains many ova.

Spawn of J. hyalinus. Length of mass 10mm. Spawn laid in May in refrigerator at 9° C, three weeks after adult collected on Menai Strait in April 2011. Each white ovoid contains many ova.