When selecting the appropriate size swimbait for varying water temperatures, there are several factors to consider. These factors include the combination of the lake you're fishing, the size of the bass in the lake, water temperature, water visibility, and the average depth that the fish are using at that time of year.
In colder water temperatures, such as during the dead of winter, it seems that bass prefer a smaller profile swimbait. This could be due to the fact that fish are less active and less willing to chase larger baits. A smaller swimbait, around 2.8 to 3 inches, may be more effective during these super cold times of the year.
As the water temperature starts to rise during the pre-spawn period, typically when it increases by about five to ten degrees, the size of the baitfish also increases. This is when larger swimbaits, around 5 inches or larger, can be more effective. Gizzard shad and threadfin shad, which are common baitfish, tend to grow larger during this time.
Additionally, the type of swimbait can also play a role in selecting the appropriate size. Hollow body swimbaits, like the Spark Chad, can be effective when fish are a bit more finicky and the water temperatures are below 50 degrees. These smaller swimbaits, around 3 inches, have a smaller profile and less action.
It's important to note that these guidelines are not set in stone and can vary depending on the specific fishing conditions and the preferences of the bass in a particular lake. It's always a good idea to experiment with different sizes and observe the fish's response to determine what works best in a given situation.
If you have any specific questions or need further clarification, please let me know.