1. There are over 370 species of sharks worldwide . fishery by - catch is the major threat to this species
  2. We are forced to conclude that the baiji is now likely to be extinct , probably due to unsustainable by - catch in local fisheries
  3. There are concerns that harvesting wild shrimp for aquaculture may deplete local shrimp populations or cause by - catch problems , hi addition , the use of wild shrimp poses a serious risk to the shrimp aquaculture industry because they may be carriers of virulent viruses . the life cycle of chinese shrimp has been closed , paving the way for the establishment of genetic improvement programs . the use of dna markers can contribute significantly to the development and implementation of genetic improvement programs


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