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.
What is croup? Croup is a disease caused by a virus, bacteria, allergies, and inhaled irritants that leads to swelling in the airways and problems breathing. A child may have stridor, which is a high-pitched sound usually heard when the child breathes in (inspiration). What causes croup? Croup is most commonly caused by viruses. It is sometimes, but rarely, caused by bacteria, allergies, or reflux from the stomach. Croup is caused by a variety of different viruses. The most common virus is the parainfluenza virus. Other viruses may include: Respiratory syncytial virus (RSV) Influenza virus. Measles. Adenovirus. Enteroviruses