The document discusses the issue of overfishing and its causes and impacts. Overfishing occurs when too many fish are caught, not allowing adequate time for fish populations to replenish. Worldwide fishing levels are two to three times more than oceans can sustainably support. As a result, at least 25% of fish stocks are overexploited or depleted. Overfishing also affects other marine life as fishing moves down the food chain, risking oceans dominated by small fish and invertebrates. Individuals can help by being aware of sustainable seafood options and choices.