Fisheries - Enviro Dynamics Namibia

More documents

Recommendations

Info

F I S H E R I E S , M A M M A L S A N D S E A B I R D S S P E C I A L I S T S T U D Y Figure 12. Distribution of fishing effort by the mid-water trawl fishery targeting horse mackerel in relation phosphate the Mining Licence Area (ML 170) for the years 2008 to 2009 Final Report Namibian Marine Phosphate (Pty) Ltd. Page 26
F I S H E R I E S , M A M M A L S A N D S E A B I R D S S P E C I A L I S T S T U D Y 3.4 SMALL PELAGIC PURSE-SEINE FISHERY The small pelagic purse-seine fishery is based on the Namibian stock of sardine (Sardinops sagax) and small quantities of juvenile horse mackerel. Commencing in 1947, the fishery is the largest by volume of landings and is operated predominantly from the port of Walvis Bay. The fishery grew rapidly until 1968 at which time the stocks collapsed. Fishing continued thereafter at a low level of effort, but the resource has not fully recovered It has since been reopened with 25,000 tonnes of sardine allocated in 2010 (the TACs allocated for sardine in recent years are shown in Figure 13). Recent biomass surveys have shown small aggregations of the stock located inshore of the 100 m isobath. TAC - Sardine ('000 tons) 140 120 100 80 60 40 20 0 Final Report Namibian Marine Phosphate (Pty) Ltd. 1991 1992 1993 1994 1995 1996 1997 1998 1999 Page 27 2000 2001 Year Figure 13. Total allowable catches of sardine for the years 1991 to 2010 The fleet consists of approximately 30 wooden, glass-reinforced plastic and steel-hulled vessels ranging in length from 21 m to 48 m. The targeted species are surface-shoaling and once a shoal has been located the vessel will steam around it and encircle it with a large net, extending to a depth of 60 to 90 m (Figure 14). Netting walls surround the aggregated fish, preventing them from escaping by diving downwards. These are surface nets framed by lines: a float line on top and lead line at the bottom. Once the shoal has been encircled the net is pursed, hauled in and the fish pumped on board into the hold of the vessel. It is important to note that after the net is deployed the vessel has no ability to manoeuvre until the net has been fully recovered on board and this may take up to 1.5 hours. Vessels usually operate overnight and return to offload their catch the following day. The environmental concerns associated with these fisheries are centred on the impacts of reduced abundance of the target species. Purse-seine fishing operations are very selective and this sector tends to have low discard rates (Atkinson and Sink 2008). 2002 2003 2004 2005 2006 2007 2008 2009 2010
Page 3 and 4: Final Report Namibian Marine Phosph
Page 5 and 6: Final Report Namibian Marine Phosph
Page 7 and 8: F I S H E R I E S , M A M M A L S A
Page 11 and 12: Tables and Figures F I S H E R I E
Page 13 and 14: 1 INTRODUCTION F I S H E R I E S ,
Page 27: F I S H E R I E S , M A M M A L S A
Page 37 and 38: 4.2 TURTLES F I S H E R I E S , M A
Page 45 and 46: 5 LEGISLATION F I S H E R I E S , M
Page 47 and 48: Extent Duration Intensity/ Magnitud
Page 79 and 80:
F I S H E R I E S , M A M M A L S A
Page 81 and 82:
10 CONCLUSIONS F I S H E R I E S ,
Page 83 and 84:
Page 85 and 86:
12 REFERENCES F I S H E R I E S , M
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101:
show all

Fisheries - Enviro Dynamics Namibia

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?