Breeding in Indian Major Carps in relation to climate change

The hatchery survey data over time scale (1990-2011) collected from the fish breeding states was compiled and a stand alone software in the form of E-atlas was developed for Bihar and Odisha states. The e-altas integrates surveyed data in a real time map.

The latest primary information on the hatcheries,fish species cultured, area, onset of breeding, period of breeding, spawn output etc. and some anlysed data are presented dynamically on GIS platform. The e-atlas, depicts the advancement of onset of breeding as well as breeding period of inland fish over the years. The spatial differentiation visualised will help planners in developing adaptation strategies for inland fisheries to climate induced changes.

Gonadal maturity stages of Indian major carps in relation to climate variables:

Monthly fish sample analysis of the morphometric characteristics, gonadal maturity stages , Gonado somatic index (GSI) and related climatic parameters revealed that the reproductive maturity of Indian Major Carps (Labeo rohita, Catla catla and Cirrhinus mrigala) has advanced by one month and the duration of spawning has also extended. The highest GSI value for L. rohita and C. catla were recorded in June - July and for C. mrigala during May & June in West Bangal. The mean maximum temperature was high during May to July with maximum rainfall range of 250-300 mm during June - July. The GSI value increase from May onwards with increasing temperature toward maximum in May with highest rainfall range 250-300mm during July-August in Madhya Pradesh, where as highest GSI value was recorded during June-August with a maximum rainfall range of 300-350mm during June-September in Odisha. In Andhra Pradesh, high GSI value of C. catla, L. rohita and C. mrigala was recorded during the months of April - July, with higher temperature range and high rainfall (500-650mm) during May-June.