Those, therefore, for which the season was close-time were invariably spared.
In sea-fishing a much larger net, sometimes enclosing more than 10,000 square yards, is employed.

This fishing is conducted chiefly at night, the electric lamp being then much more effective in attracting the prey, and lowered only a few inches below the surface.

Many large destructive creatures, unfit for food, generally of a nature intermediate between fish and reptiles, haunt the seas.

It is held unwise to exterminate them, since they do their part in keeping down an immense variety of smaller creatures, noxious for one reason or another, and also in clearing the water from carrion and masses of seaweed which might otherwise taint the air of the sea-coasts, especially near the mouths of large tropical rivers.

But these sea-monsters devour enormous quantities of fish, and the hunters appointed to deal with them are instructed to limit their numbers to the minimum required.