Table S1. List of 157 Operational Taxonomic Units (OTU) found from ichthyoplankton collections taken in 2014 from Cabo Pulmo National Park. The results from NCBI's GenBank, including accession numbers, and the Barcode of Life Database, including sample ID, are shown as well as the percentage of identical sites (% Iden) that matched for each sequence. OTU NCBI Result Accession # % Iden Barcode of Life result Sample ID % Iden Acanthemblemaria macrospilus Acanthemblemaria macrospilus Calamus brachysomus Calamus brachysomus KJ012304 100.0 NO MATCH Carangoides orthogrammus Carangoides orthogrammus KU943780 99.0 NO MATCH Carangoides otrynter Caranx latus JQ841100 90.3 Carangoides otrynter Co-29-IMARPE 100.0 Caranx caninus Caranx caninus EU752066 99.8 NO MATCH Caranx sexfasciatus Caranx sexfasciatus KU199209 100.0 NO MATCH Carapus dubius Halichoeres pictus JQ839789 82.2 Carapus dubius 100.0 Cephalopholis panamensis Cephalopholis cruentata GU225173 94.8 Cephalopholis panamensis 99.8 Chanos chanos Chanos chanos LT669927 100.0 NO MATCH

The distributional diversity and assemblages of fish larvae in the Gulf of California indicated two main seasonal stages and two transitional periods: in winter, the tropical water mass is confined to the south-east portion of the mouth of the Gulf and larval fish assemblages are dominated by subtropical and temperate-subarctic species; in summer; tropical water invades the Gulf and assemblages are dominated by tropical species. Both seasonal stages are separated by transitional periods coinciding with strong latitudinal temperature gradients. During the autumn and spring transitional periods, the Gulf of California splits into three regions: a northern region where temperate and subarctic species spawn from autumn to spring, a southern region dominated by tropical and subtropical species year round and a central region where tropical and temperate assemblages merge. Seasonal changes in the location of the regions, as well as the borders between them, show expansion and contraction of the northern and southern faunas related to the general oceanic circulation patterns during the year. # 2004 The Fisheries Society of the British Isles

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Larval and juvenile Eucinostomus currani are described based on pigmentation, meristics and morphometric characteristics of 198 specimens collected in Bahı´a de La Paz and Ensenada de La Paz, B.C.S., Mexico. Diagnostic characteristics are the presence of head melanophores and several punctuate melanophores scattered over the lateral surface of the gut from early stages, a tricolour pigment pattern forming on the dorsal fin in postflexion stage and black stripes on the flanks of prejuveniles and juveniles.