3B is a top plan view of an embodiment having a shorter vent tube, for use with small fish;FIG. 4 is a bottom plan view when the vent tube is in its stored configuration;FIG. 5 is a first side elevational view when the vent tube is in its stored configuration;FIG. 6 is a second side view when the vent tube is in its stored configuration;FIG. 7 is a front elevational view of a first embodiment of t