From avril to july

G. Smith, The Laboratory of School of Arts containing a large collection of valuable secrets, experiments, and munual operations in Arts and Manufactures, vol. II, Londres,
C. Whittingham, 1810, p. 301.

Cadis-worm, or cod-bait, found under loose stones in shallows rivers: they are yellow, bigger than a gentle, with a black or blue head, and are in season from April to July. Keep them in flannel bags.