Translation of "strenuously" into Indonesian

The men stretched a net between the boats; then the crews rowed strenuously in opposite directions, letting out the net as they encircled the fish.

Pria-pria itu menebar jaring di antara kedua perahu, kemudian para awak mendayung dengan kuat ke arah yang berlawanan, melebarkan jaring seraya mereka mengelilingi ikan-ikan tersebut.