Cage culture was initiated in: - Solved MCQ | Agrigyan

Silver carp (Hypophthalmichthys molitrix) is an efficient pelagic microphagous phytoplanktivorous filter-feeder equipped with specialized sponge-like fused gill rakers capable of filtering particles down to 4–10 microns. It is stocked in ponds and reservoirs to graze down excessive microalgal blooms.

Gracilaria is an economically vital genus of marine Red Algae (Rhodophyta). It is cultivated commercially along Indian coasts (such as in Tamil Nadu and Gujarat) as a primary source of industrial phycocolloid Agar-agar (agarophyte).

In integrated fish-cum-duck farming systems, layer ducks (such as Khaki Campbell or Indian Runner) attain sexual maturity and initiate egg laying at approximately 24 weeks of age (around 6 months). They lay 200–300 eggs per year under good management.

Optimal stocking density of carps is determined by the combination of: (1) Targeted harvest yield/size, (2) Pond carrying capacity (governed by natural productivity, aeration, water depth, and feeding rate), and (3) Species composition and behavioral feeding niches (surface, column, and bottom feeders in polyculture).