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The d~stnbution and relative abundance of pilchard Sardinops sagax neop~lchardus eggs and larvae along the south coast of Western Australia were determined in July and December 1991 In July there were 2 sites of spawning activlty large numbers of Day 1 eggs were found along the inner shelf region, 2 to 6 km from the coast off the I n g George Sound region of Albany, with a further peak in the inner and mid shelf reglons off Bren~er Bay 150 km east of Albany Almost no eggs were found in the area west of Albany where the seasonally strong eastwards-tlowing Leeuwin Current was located close to the coastl~ne The peak In the concentration of Day 2 eggs was located some 40 km east of Albany, w ~ t h peaks in the abundance of the yolk-sac and post-larvae found 100 and 150 km east of Albany, respect~vely This vanation In the locat~on of the different p~lchard stages was consistent with an eastwards transport rate of 0 5 to 1 0 knots By contrast in Decembe~ , when the Leeuwin Current was weak, there was no evidence of unidirectional transport with the peaks in the abundance of all pilchard stages located in the Albany reglon The influences of the vana t~on in tiansport between spawnlng seasons on the structure of pilchard stocks in this area and the imphcat~ons for the management of the fishenes in t h ~ s region are discussed The value of using several boats for simultaneous sampling to provide a 'snapshot p~cture ' is demonstrated A companson of plankton towing methods showed higher relative catch rates for Day 1 pilchard eggs using vertical compared with oblique tows, 1~1th the reverse found for Day 2 eggs

Interseasonal variation in the transport of pilchard eggs and larvae off southern Western Australia