The video shows the injection of an African catfish (Clarias gariepinus) female. You may notice the small-medium size of female broodstock, the place of injection (dorsal part) and covering fish eyes as a means of calming. Anesthesia may be required especially in larger broodstock.
Note: the credit of these video clips goes to colleagues who participated in aquaculture training courses organized by the Egyptian International Centre for Agriculture (EICA). I am trying to identify the colleagues who donated me these clips and I will personalize the credits if I am successful in my attempt.