Channel Catfish: 11 inches minimum total length limit (see Catfish below for possession limit).
Blue Catfish: 12 inches minimum total length limit (see Catfish below for possession limit).
Flathead Catfish: 14 inches minimum total length limit (see Catfish below for possession limit).
Catfish (blue, channel and flathead): The possession limit for catfish caught recreationally shall be 100. The 100 fish may be a single species, or a combination of blue, channel or flathead catfish. A recreational fisherman may possess a maximum of 25 undersize catfish of a single or combination of all three species within the 100 fish possession limit. The maximum possession limit for catfish caught in Toledo Bend Reservoir on a recreational license shall be 125 fish which may be any combination of species of catfish. A recreational fisherman may possess on Toledo Bend Reservoir, a maximum of 50 undersize catfish
which may be any combination of species of catfish.
Taken from:
http://www.wlf.state.la.us/fishing/recreational/freshwater/regulations/BTW I like to use at least 2 liter bottles (and a good fish will still sink that) but run them every couple hours at least.