Fishery resources ppt

It gives an description about aquatic fauna

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

4. Living & non - living resources 4

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,salinity,pressure,substratum,etc. 5

6. AQUATIC ANIMALS 6

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 H ave 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