ANAESTHETIC EFFECTS OF SODIUM BICARBONATE AT DIFFERENT CONCENTRATIONS ON AFRICAN CATFISH (Clarias gariepinus) JUVENILES

Year 2016, , 151 - 158, 21.04.2016

Cecilia Muthoni Githukia Elijah Migiro Kembenya Mary A. Opiyo

https://doi.org/10.3153/JAEFR16017

Abstract

In
the present study, anaesthetic effects of different sizes (5, 10, 15, 20, 25,
30, 35 and 40g) of African catfish (Clarias gariepinus) juveniles was
investigated at different concentrations (0/control, 10, 15, 20, 25, 30, 35,
40, 45, 50 g/L) of sodium bicarbonate. Juveniles were bath immersed in each of
the different concentrations of sodium bicarbonate solution for 5 minutes and
recovery times in clean aerated water was established. Juveniles took
between 0.67 to 5.44 minutes to reach full anaesthesia and 0.66 to 4.25 minutes
to recover fully from anaesthesia. An inverse exponential relationship was observed between
sodium bicarbonate concentrations and induction time, whereas exponential
relationship was observed between sodium bicarbonate concentrations and
recovery time. Size of C. gariepinus juveniles significantly affected the induction time (P < 0.05)
with smaller juveniles getting to full anaesthesia faster than bigger juveniles
at the same concentration of sodium bicarbonate. In addition, recovery time was
size dependent where smaller C. gariepinus juveniles took significantly longer time (P < 0.05) to recover
from anaesthesia than bigger juveniles. All juveniles reached anaesthesia and
recovered in less than 5 minutes except for 30 g juveniles at 15g/L of sodium
bicarbonate which was anaesthetized at 5.44 minutes.

Keywords

Immersion, Induction, Recovery, Anaesthesia

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