Fish do not vanish when the season turns. They move, and the reason is usually temperature, salinity and bait. A catch log is the cheapest tool you own for turning that movement into a pattern you can actually plan around.
Water temperature controls how much a fish needs to eat and where it is comfortable. As the water cools, many species slide deeper or closer to shore where the sun warms the shallows. As it warms, they push into cooler water or feed at night instead.
Salinity shifts too, especially after rain and near shallow flats and outlets. Some species simply avoid the fresher band and move along the coast until it settles. Add the seasonal bait movement and you get a picture that changes every few weeks.
The practical effect: a spot that produced well in one month can be dead quiet two months later. That is the whole argument for writing it down instead of trusting memory.
Keep it short enough that you will actually keep doing it. Six fields, three minutes at the ramp:
Log the blanks too, and add one line on how the water felt: choppy, murky, full of life. Those small notes add up into a map you can read later instead of a list of dates.
Ten to fifteen trips is enough to see something. Look for repeats rather than one good day: which tide state keeps showing up on your better trips, what wind was blowing on the blanks, and whether one depth range is doing most of the work.
Change one variable per trip. If you change spot, bait and timing at once, the log tells you nothing, and you are back to guessing on the water.
If you have older notes, compare the same window a year back. Does the same week produce the same pattern? Repetition across a whole season beats a single brilliant trip.
If paper is the reason you stop logging, move it to your phone. The B7R app has a catch log for date, tide and spot, sitting next to its seasons and sea state sections, so the record builds as you plan the trip.
Before each trip, skim your last two weeks. As the season turns, the target species and the productive depth both shift, and a small adjustment to the plan saves fuel and time. Log the blank trips as well โ they carry the same information as the good ones.
Keep the plan flexible. If the log says your best bites came on the incoming tide at one depth, start there and work outward, instead of running the same circuit every weekend out of habit. Write the target species and tide window at the top of the notes.
Seasons move the fish, and a simple catch log moves your knowledge. Log it, read it, adjust the plan. B7R app is free on Google Play and keeps the catch log, seasons and fish guide in one place: https://play.google.com/store/apps/details?id=com.q8dm.b7r