fish hepatic parenchyma is divided into lobules

macrophotograph photomacrography close liver fish anatomy extreme structure organs freshwater fishes anatomical animals pike esox lucius jackfish jack gar common pickerel hepatic chawdron guts entrails garbage inside interior bejesus parts body intestines splanchnology entrail bowels humbles purtenance umbles gib ichthyology study schooling biology airbladder sound fishmaw pneumatocyst maw air bladder pneumatophore maintaining buoyancy