Meaning in auttum weather is harsher and it is not so easy to fish unless you have a good ability. In may (spring) the water is warmer and all fish are swiming around .

2) “It is good that we do not have to try to kill the sun or the moon or the stars. It is enough to live on the sea and kill our true brothers” (75).

3) On man vs. nature: “The clouds were building up now for the trade wind and he looked ahead and saw a flight of wild ducks etching themselves against the sky over the water, then blurring, then etching again and he knew no man was ever alone on the sea.” (61)

i think you can figure out the meaning of number 2 and 3. they are not so hard. It just takes a little imagination