Maturation and spawning of Indian mackerel

Abstract

The relation between body length and mature ovary is curvilinear whereas
a straight line relation exists between the weight of the fish and weight of
the ovary. Mackerel is a prolific breeder. Ova diameter studies indicated the
presence of 6 batches of ova in the mature ovary at a time, the first batch
ripening in a short period. Histological studies revealed the presence of early
perinucleolar oocytes even in partially spawned ovaries, suggesting a
continuous oogenesis and production of more than six batches of ova. Intensive
spawning takes place from April to July. Monsoon and upwelling with
consequent replenishment of nutrients effect a plankton bloom in the surface
waters causing a spurt in the reproductive output of mackerel resulting in
intensive spawning, reduced larval mortality and better recruitment