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The Oaxaca coast in Mexico has a narrowcontinental shelf and it reaches depths greater than 500meters near the coast; furthermore it consists of bays andsheltered areas, where high food availability is found. Eachweek, from March 2001 to December 2005, the unloadingareas of artisanal fisheries between the bays of Huatulco andPuerto Escondido in the Oaxaca coast were visited. Data onfishing gear and zones, as well as the species composition ofthe captures were taken. In the zone, three fishery unitsoperated: shark, pelagic and demersal. All three capturesharks in a direct or incidental way. At the studied region,419 organisms of S. lewini were registered; from August toSeptember newborn individuals (43.9%, 44 to 64 cm of totallength), young of the year (9.3% 65-75 cm Tl) and juveniles(30.3%, 75 to 168 cm Tl) were observed; pregnant femaleswere registered in March, May and June with a fecundityranging from 18 to 24 embryos (35 to 45 cm Tl). With respectto C. falciformis, 1314 individuals were registered. Newborns(4.7%, 65-71 cm Tl) and young of the year (3.8%, 72 to 80cm Tl) were observed from January to September; juveniles(65.4%, 80 to 170 cm Tl) were captured throughout the year;from January to November, 52 pregnant females wereobserved with embryos at different developmental stages. Thepresence of newborns, young of the year and pregnantfemales with embryos in advanced development condition,suggest that the coastal waters near the shoreline of theOaxaca coast are a spawning and nursery area for these sharkspecies.

revista de biología marina y oceanografía

Presencia de neonatos y juveniles del tiburón martillo Sphyrna lewini (Griffith &amp; Smith, 1834) y del tiburón sedoso Carcharhinus falciformis (Müller &amp; Henle, 1839) en la costa de Oaxaca, México