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.
Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Croup) that could possibly cause Croup includes: 1  Viral respiratory infection. 2  Common cold. 3  Laryngitis. 4  Laryngotracheobronchitis. 5  Bacterial respiratory infection-less common than viral. 6  Diphtheria.