Somehow, intensive aquaculture seems to have avoided the close scrutiny of the economics of diminishing returns. The basic costs for low management catfish production, feed ($630; $0.14/lb) and fingerlings ($225; $0.15/fish), would be $855/acre.ow density, autumn stocking in combination with temperature-based feeding substantially increased channel catfish fingerling weight by the subesequent spring. The advanced spring fingerling size (0.19-lb) allowed production of a 1.45-lb food-fish (1343 fish/acre) in 180 days.
Overview. Croup or Acute Laryngotracheobronchitis (ALTB) is a viral infection of the throat (upper airway). The virus causes swelling of the voice box (larynx) and windpipe (trachea). The swelling narrows the airway and makes breathing hard.
Croup Causes. Croup is most commonly caused by a viral respiratory infection that is easily passed among children. Common viral causes include parainfluenza (responsible for the majority of infections), influenza, adenovirus, respiratory syncytial virus (RSV), and rhinovirus.roup Causes. Croup is most commonly caused by a viral respiratory infection that is easily passed among children. Common viral causes include parainfluenza (responsible for the majority of infections), influenza, adenovirus, respiratory syncytial virus (RSV), and rhinovirus.