The mating system in which both male and female fishes have multiple partners during breeding with little or no mating choice is called:

Correct option is B

→ Promiscuity refers to a mating system where both males and females mate with multiple partners without forming pair bonds.
→ Common in species where spawning occurs in groups or aggregations.
→ Ensures maximum genetic mixing and reproductive success.
Information Booster:
→ Seen in many pelagic fishes and broadcast spawners.
→ High egg and sperm release leads to external fertilization efficiency.
→ Reduces mate competition and increases fertilization probability.
Additional Information (Other Options):
(a) Polygyny: One male, multiple females.
(c) Polyandry: One female, multiple males.
(d) Monogamy: One male–one female pair bond.