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 is swelling around the vocal cords that causes difficulty breathing and is accompanied by a âbarkingâ cough. One of the most common causes of croup is a virus called parainfluenza.Who is at risk for croup? People of all ages are at risk for croup, but it is most common among infants and children between the ages of 3 months and 5 years. Some children are prone to croup and may get it several times.roup is swelling around the vocal cords that causes difficulty breathing and is accompanied by a âbarkingâ cough. One of the most common causes of croup is a virus called parainfluenza.