 | 1876 - 494 páginas
...shoal is entirely broken up, each fish taking an independent path and darting from one side of the tank to the other with an amount of agility scarcely to...on successfully at night, that being the time when the fish rise to the surface of the water, to feed on the innumerable organisms that there abound.... | |
 | 1876 - 802 páginas
...light the fish still retained their active habits, and it was noticeable that during these night-hours they were more than ordinarily alert for food, dashing...explain why " drift-net " fishing for herrings can be carried on successfully only at night, that being the time when the fish rise to the surface of... | |
 | 1876 - 1054 páginas
...shoal is entirely broken up, each fish taking an independent path and darting from one side of the tank to the other with an amount of agility scarcely to...on successfully at night, that being the time when the fish rise to the surface of the water, to feed on the innumerable organisms that there abound.... | |
| |
In the latter instance these movements are very quiet and uniform, the fish swimming"round their tank in one shoal and one continuous stream. At night, on the contrary, the shoal is entirely broken up, each fish taking an independent path and darting... 