Canadian Fishing Industry? Changes in Equipment that lead to a HUGE increase in the

[Sophia A]

amount of East Coast Cod? Hey everyone!!
I have a huge geo. assignment but i don't know one question....

22.) What happened to the cod catch from 1950 to 1960? Explain what changes to fishing equipment might have occured to cause this pattern.

Well that was the question...
In the chart, in 1950, 400 fishes were caught and in 1960, 800 fish were caught... so what changes in the fishing equipment. My teacher told us to keep in mind that after World War 2, they're a lot of technological advances and i have no clue... Can you please help me???

BEST ANSWER WILL BE GIVEN FOR THE MOST DETAILES ANSWER AND PLEASE PUT YOU SOURCE ( teacher, own knowledge, guess, 100% sure ect..)

I greatly appreciate ANY answers and i truly value everyone's time and thought into this question and reading it too. Thank you SOOO Much!