This paragraph seems so difficult-to-understand to me especially the underlined parts!
By protecting large areas from commercial fishing, we could once more see what 18th-century literature describes: vast shoals of fish being chased by fin and sperm whales, within sight of the English shore. This policy would also greatly boost catches in the surrounding seas; the fishing industry's insistence on scouring every inch of seabed, leaving no breeding reserves, could not be more demanding to its own interests.
"Fin and sperm whales" means "fin whales and sperm whales". " "Scouring" is literal. It emphasizes the destruction cuased by bad fishing techniques.
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"Fin and sperm whales" means "fin whales and sperm whales".
"Within sight of the English shore" means "in the sea so close to England that you can see them from land."
"Scouring" is literal. It emphasizes the destruction cuased by bad fishing techniques. The seabed is scrubbed until it is bare.
"Leaving no breeding reserves" is puzzling there. The scouring would leave nothing