Temperature tolerance and hypoxia tolerance within and among the species of Ribbon fish

Mrs. Nagma Tamkeen; Dr.S. Rangoonwala; Dr.Ansariya Rana

Volume : V, Issue : VIII, August - 2016

Temperature tolerance and hypoxia tolerance within and among the species of Ribbon fish

Mrs. Nagma Tamkeen, Dr. S. Rangoonwala, Dr. Ansariya Rana

Abstract :

 Climate change and its influence on ecosystems, requires evaluation of species and their ability to cope with the changing temperatures. In fishes, performance failure at high temperature is associated to thermal tolerance CTmax (critical maximum temperature) and hypoxia tolerance supporting OCLTT concept (oxygen and capacity limited thermal temperature). Ribbon fish occurs widely along the Khar– Danda sea coast 18.96�Š N &72.82�Š E of the western sea coast of Mumbai,Maharashtra,.It is represented in Indian water by six species out of which four species namely Trichiurus lepturus, Trichiurus savala (Cuvier) Eplurogamus maticus (Gray) and Eplurogamus intermides (Gray) are common to Mumbai coast of Maharashtra. Gupta (1967), James (1967), Rao et al (1977). The Temperature here varies between 25°C to 35°C . Due to climate change it has increased to a maximum of 41.3°C in March 2011(Highest in decade). The species have been greatly affected by thermally limited oxygen delivery(26,30) which closely matches with environmental temperature of the place). It has ought a decrease in their population , growth pattern and aerobic performance Thus the warming sea will be the first step to cause extinction of the marine life(11, 37). The difference between the demand for oxygen and the capacity of oxygen supply to tissues is the first mechanism to restrict animal tolerance to thermal extremes.