skipped spawning

sexually mature fish that do not spawn every year. The reasons vary but usually relate to poor conditions. However the reason can be increased food availability which is then used for growth, as well as decreased food availability not providing enough energy for egg growth. The condition is seen early in life, in those fish that spawned in the previous year(s), when fishing mortality at spawning grounds was high, when natural mortality at feeding grounds was low, and when the cost of migration was too high in terms of mortality and energy requirements