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Fishery resources ppt

  1. FISHERY RESOURCES P.SHOBIYA Department of Fisheries University of Jaffna
  2.  It refers to elements of a natural aquatic resource which can be legally caught by fishing. It may sometimes be taken as including also the habitat of such resources.  It means any one or more stocks or species of fish and aquatic life. WHAT IS FISHERY RESOURCES? 2
  3.  “Fisheries” : the harvesting and farming of aquatic animals and plants, and the related industries, which include processing and distribution of the products.  “Resources” : various materials used by human beings in carrying out the activities of their productions.  “fisheries resources” : the fisheries biological aggregations being used presently or to be used in future by fishing activities. FISHERIES + REOURCES = FISHERIES RESOURCES 3
  5. LIVING AND NON – LIVING RESOURCES BIOTIC  Living part of the environment  Interdependence of all organisms living in the aquatic environment  Aquatic animals, Aquatic plants and Micro organisms ABIOTIC  Non living part of the environment  Tempertaure,light,water,soil,rocks,sali nity,pressure,substratum,etc. 5
  7. INVERTEBRATES : CNIDARIA • Cnidarians have radially symmetrical body. • There are two forms as Polyps and Medusa. 7
  8. INVERTEBRATES : ANNELIDA • Body is bilaterally symmetrical. • They are vermiform (worm-like body shape). • Body consists of segments. Therefore, known as segmented worms. 8
  9. INVERTEBRATES : MOLLUSCA • They are bilaterally symmetrical. • Soft bodied animals. • Possess a muscular foot. • Some Molluscs bear shells. 9
  10. INVERTEBRATES : ARTHROPODA • Arthropods are bilaterally symmetrical. • Their body possesses an external skeleton/exoskeleton. • All Arthropods have jointed appendages 10
  11. INVERTEBRATES : ECHINODERMATA • Spiny skin • A five part body • Water vascular system • Tube feet 11
  12. VERTEBRATES : PISCES • Body is invariably streamlined. • The body is covered with scales. • Has fins to swim through water and to balance while swimming. • Breathe using gills. 12
  13. VERTEBRATES : AMPHIBIA • Skin is thin, moist and glandular. No scales in the skin. • Some species use limbs for locomotion. • Respiration is carried out by lungs, through wet skin or mouth. 13
  14. VERTEBRATES : REPTILIA • Possess a dry skin with scales. No glands are present in the skin. • Use limbs for locomotion. But some reptiles are limbless. • Breathe using lungs. 14
  15. VERTEBRATES : AVES  Streamlined body is designed for flying.  Body is covered with feathers.  They do not have teeth but the beak is adapted for feeding.  Breathe using lungs 15
  16. VERTEBRATES : MAMMALS  Have lungs to breathe  Have hair  Bear live young  Presence of mammary gland 16
  17.  Source of food  Economy ,trade and transportation  Recreation  Biodiversity  Medical potential/drug  Climate  Fossil fuel and energy source IMPORTANCE OF FISHERY RESOURCES 17
  18.  Overfishing and by catch  Habitat damage  Climate change  Marine Pollution Drainage, Sewage, Eutrophication  Gear Loss and Ghost Fishing  Illegal fishing methods FISHERIES IMPACT ON RESOURCES 18
  19.  To maintain ecosystem health, integrity and sustainability.  Protect the productive potential of the system other than protecting an individual species or stock as a resource.  Make decision regarding balancing human needs with resource productivity requirements.  Species sustainability keeping biomass levels above levels where recruitment could be affected  Ecosystem sustainability Ensuring that any impacts on ecosystem structure and function are kept at acceptable levels THE NEED TO CONSERVE FISHERY RESOURCES 19
  20. Overfishing and by catch  Restricted entry to fishery, catch quotas, limits or requirements on gear, limits on fishing seasons, limits on fishing areas, no take areas, prohibitions on dumping or discarding gear.  Attempts to reduce or eliminate government subsidies  contributing to fishing over-capacity.  Government control programs based on minimizing ecosystem effects  Surveillance and compliance programs including VMS. CONSERVATION OF FISHERY RESOURCES 20
  21. Habitat damage  Limits on gear, limits on fishing areas, no-take areas.  Fixed mooring systems in sensitive (eg coral) environments.  Surveillance and compliance programs.  Protection of the catchment of high conservation value estuaries and rivers to maintain natural water flows and water quality. CONSERVATION OF FISHERY RESOURCES 21
  22. Climate change  International agreements, such as those focused on greenhouse gasses or chlorofluorocarbons or and the implementation programs which follow, including incentives, prohibitions and market-based schemes aimed at reducing GG emissions. CONSERVATION OF FISHERY RESOURCES 22
  23. Pollution  Focused on fixed point sources, mobile point sources and diffuse terrestrial sources – including dumping and emissions to air and water .  Controls on marine noise.  Controls focused on specific pollutants, such as plastics or highly toxic or radio-active substances.  Integrated coastal and river basin planning, including objectives to limit the passage of nutrients and other pollutants to the marine environment.  Surveillance and compliance programs. 23 CONSERVATION OF FISHERY RESOURCES

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