"The need for conservation of fishery resources in aquatic ecosystems (marine, lentic and lotic) arise when the sustainable exploitation is jeopardized by irrational anthropogenic activities, like destroying and polluting the aquatic habitats, indiscriminate altering the natural ecosystems and overfishing leading to massacre of juveniles and brood stocks to maintain the future progeny.
This is exactly happened in case of fishery resources globally, and regionally. With the advent of industrial revolution at the beginning of twentieth century and the invention of oil-fired diesel engine...