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.
Causes and Risk Factors for Croup. In most cases, croup develops from a cold or flu virus. In rare cases, a bacterial infection (e.g., Mycoplasma pneumoniae, Streptococcus pneumoniae [types of bacteria that can cause pneumonia]), allergy (e.g., pollen), or inhaled irritant (e.g., food particle) can cause croup.