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.
There are several viruses that can cause croup. Seventy-five percent of cases come from parainfluenza viruses (the common cold). Other viruses that may cause croup include adenovirus (another group of common cold viruses), respiratory syncytial virus (RSV), the most common germ affecting young children, and measles.Croup may also be caused by allergies, exposure to inhaled irritants, or bacterial infections.ther viruses that may cause croup include adenovirus (another group of common cold viruses), respiratory syncytial virus (RSV), the most common germ affecting young children, and measles.