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S\~lmrnlng speeds of the late-stage, pelaglc larvae of coral-leef flshes were measured in situ near Llzard Island on Australia's Great Barrler Reef, and Ranglroa Atoll, Tuamotu Islands, French Polynes~a dunng 1995-96 Larvae were captured w ~ t h llght traps and crest nets, and released indiv~dually In open water They were then followed by SCUBA d ~ v e r s , normally for 10 mm, and their speed was measured w ~ t h a m o d ~ f ~ e d plankton-net flow meter and a stop watch Swlmmlng speeds of 260 lalvae of 50 specles In 15 famll~es of mostly perclform reef f ~ s h e s are presented Most measurements were for pomacentnds (8 genera 16 specles, 127 ~ n d ~ v i d u a l s ) , apogonids (1 genus, -5 specles, 18 1nd1vlduals), chaetodontids (3 genera. 8 specles, 49 ~ndlviduals) , lethrlnlds (1 genus, -4 specles, 11 lndivlduals), nemipterlds ( l genus, 2 specles, 10 ~ndlvlduals) , serranlds (2 genera, 2 specles, 14 md~vlduals) and acanthurlds (2 genera, -4 specles 13 ~ n d ~ v l d u a l s ) Numbers of lndlvlduals per specles ranged from 1 to 25 Speeds were remarkably hlgh for such small flshes (0 7 to 5 5 cm) Average speed was 20 6 cm S ' (ranqe 2 to 65), or 13 7 body lengths s ' (range 2 to 34) SE fol specles wlth n > 4 ranged from 0 8 to 5 3 cm s ' 14 1 to 25 0"0 of mean speed), but speed of the fastest lndlvldual ot each specles averaged 144 "/o of mean speed A taxonom~c component was evident, with apogonlds the slowest (2 to 13 cm S l ) , followed by nemipterlds (10 cm s ' ) Speed of pomacentr~ds and chaetodontlds varled wldely among specles (7 to 35 cm s '), whereas acanthunds, lethrlnlds and se r r an~ds were fast ( l 9 to 55 cm S-') Except for apogonlds and nem~ptel-lds, nearly all specles had mean swlmming speeds greater than average ambient current speeds In the L~zard Island area Mean speed was positively correlated wlth size (slope 8 2, r2 = 0 43) when all taxa were lncluded but was not correlated wlth slze for the Pomacentndae and Chaetodontidae when each were considered alone The speeds reported here combined wlth data on swimming endurance recently reported by Stobutzk~ & Bellwood (1997. Mar Ecol Prog Ser 149 35-41) reveal remarkable swlmnling ab lh t~es for late-stage pelaglc larvae of coral-reef flshes whlch could e ~ t h e r gleatly enhance d~spersa l or eliminate it

In situ swimming speeds of the late pelagic larvae of some Indo-Pacific coral-reef fishes