Influence of temperature on the respiratory rate of Nile Tilapia, Oreochromis niloticus (Pisces: Cichlidae) in the laboratory

Ahmed S Dan-Kishiya,John R Solomon,Umar A Alhaji,Hadi S Dan Kishiya

doi:10.22458/urj.v8i1.1617

Abstract

Tilapia, Oreochromis niloticus, (Linneaus, 1758) is an important aquaculture species in Nigeria and other parts of the world. We obtained specimens (3,5-13,00 cm total length; 1,7 to 49 g) from Jabi Reservoir, Nigeria, and exposed them to 18-38o C. The frequency of opercular beats (i.e.respiratory rate) was determined from videos. At room temperature (28o C), the average frequency of opercular beats per minute for the weight groups of 1, 7 – 3,3; 4,0 – 7,0; 11,0 – 20 and 40 – 49g were 218, 190, 167 and 119 respectively. It decreased to 153, 137, 94 and 77 beats respectively when the water temperature was lowered to 18o C. It subsequently increased to 283, 267, 209 and 136 beats respectively when water temperature was raised to 38o C (p<0, 05).

Highlights

RESUMEN: La Influencia de la temperatura sobre la frecuencia respiratoria de la tilapia del Nilo, Oreochromis niloticus (Pisces: Cichlidae) en el laboratorio
The study by Mustapha (2009) in Oyun Reservoir while in Eleiyele (Olaniran, 2003), Osinmo (Komolafe & Arawomo, 2008) and Lower Usuma Reservoir (Dan-Kishiya, 2012) confirmed the dominancy of tilapias in Nigerian waters but due to global warming, there is the tendency of this unique fishery resource to suffer environmental effects such as temperature
The opercular beats increased with the increasing temperature and reduced with increase in both length and weight (Table 1)

Summary

Introduction

RESUMEN: La Influencia de la temperatura sobre la frecuencia respiratoria de la tilapia del Nilo, Oreochromis niloticus (Pisces: Cichlidae) en el laboratorio. A temperatura ambiente (28°C), la frecuencia media de latidos operculares por minuto para los grupos según el peso de 1,7 a 3,3; 4,0 a 7,0; 11,0 a 20 y de 40 a 49 g fueron 218, 190, 167 y 119 respectivamente. Posteriormente cuando la temperatura del agua dismuyó a 18 oC la frecuencia de latidos disminuyó a 153, 137 , 94 y 77 golpes , respectivamente. Cuando la temperatura del agua se aumento a 38°C, los latidos aumentaron a 283, 267, 209 y 136, respectivamente (p

Methods

Results

Conclusion