Which of the following fish are bred exclusively in the cold regions of India ? I. Catla. II. Tinca. III. Bhekti. IV. Trout. Choose the correct answer from the codes given below.

Tinca (tench) and Trout are cold-water species bred exclusively in cooler regions of India; reference sources list Tinca and Trout together as species reared in cold regions, making them the exclusive cold-water candidates in the given list . National fisheries classification identifies Trout under coldwater fisheries, further supporting Trout’s exclusive cold-region culture in India [1]. By contrast, Catla is an Indian major carp used in warm‑water freshwater polyculture (not restricted to cold regions) [3]. The other listed fish, Bhekti (identified in sources with warm/coastal affinities), is likewise not an exclusively cold‑region species . Therefore the correct pair bred exclusively in cold regions is II and IV (Tinca and Trout).

Sources

1. [1] https://nfdb.gov.in/PDF/Fish%20&%20Fisheries%20of%20India/1.Fish%20and%20Fisheries%20of%20India.pdf
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 9: Agriculture > BLUE REVOLUTION > p. 83
3. [3] https://www.fao.org/fishery/docs/CDrom/aquaculture/I1129m/file/en/en_catla.htm