University:
York University
Course:
SC/BIOL 2021 | Cell Biology
Academic year:

2019
Views:

297

Pages:

3
Author:

Nick T.

A Stock: An area where fish with similar growth rate, fecundity, and mortality date are found. Pelagic Fish: Purse nets. Demersal Fish: Bay trawls. By-catch: An ecological and economic issue. Creatures who aren't targeted but still caught. Can be the same species but undersized. To determine who is targeted: Need to know the life cycle. For various reasons, not all equally abundant: Larval and juvenile fish are important. Depend on temperature and development rate. When yolk sac is consumed, a larvae must quickly find a food source. Turbulence prevents effective eating for larvae. Recruitment increases # of spawners, but more larvae means more competition and less resources. Fish Stock Dynamics: Recruitment and growth increase biomass. L varies due to natural and fishing mortality. Fish and natural mortality reduce fish stock. CPUE = catch per unit effort. Assume that natural mortality is low. Recirculation Systems: Are costly. Shrimp Farming: Good, high-value crop. Conventional Shrimping: Done with nets, resulting in high by-catch loss. Technology: Has improved understanding of shrimp. White Shrimp Imports: Are quarantined. Female Shrimp: Making them have larger eyes and less mobile has increased successful breeding. Increasing Numbers: Increases chances of disease. Shrimp Origin: Unless stated, shrimp usually comes from Southeast Asia. Oysters: Probably come from Galveston. Hatcheries: Could be used for consumption but not successful for releasing.