Multispecies perspective for small-scale fisheries management: A trophic analysis of La Paz Bay in the Gulf of California, Mexico

Nitrogen isotopes in otoliths reconstruct ancient trophic position

“…Mature T. macdonaldi supposedly undergo a winter migration south following schools of sardine, returning in early spring to spawn in the Colorado River estuary (Flanagan and Hendrickson 1976), and thus the δ 15 N values in the adult stage should include the record of T. macdonaldi diet during migration. However, there is been no evidence of T. macdonaldi changing its feeding habits during migration, and is widely recognized as an apex predator in its adult stage (Morales-Zarate et al 2004;Sala et al 2004;Diaz-Uribe et al 2007;Lercari and Chavez 2007). Second, this system appears to be robust to interannual variation in source δ 15 N values.…”

“…Totoaba macdonaldi (totoaba) is a long-lived, apex predator (Morales-Zarate et al 2004;Sala et al 2004;Diaz-Uribe et al 2007;Lercari and Chavez 2007) that can reach up to 2 m in length (Flanagan and Hendrickson 1976). Totoaba were fished heavily from the 1940s until they were listed as endangered in 1975 (Flanagan andHendrickson 1976;Cisneros-Mata et al 1995).…”

Differential zooplankton aggregation due to relative vorticity in a semi-enclosed bay

“…1). The region plays an important ecological role because it is a feeding area, shelter area and habitat for various ecologically and economically important fisheries species, such as turtles, squid, and finfish (Díaz-Uribe et al, 2007). The bay communicates with the Gulf of California through two openings: Boca Grande (wide and deep) to the north and the San Lorenzo Channel to the east (shallow and narrow).…”

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“…Gill net is being considered among important fishing gears deployed by small-scale fishermen worldwide capable of matching large-scale fisheries in term of bycatch collection (Bundy and Pauly, 2001;Diaz-Uribe et al, 2007). Unfortunately, fish resources exploited by these fisheries are seldom studied and generally are not taken into account for assessment and management programs (Dıaz-Uribe et al, 2007).…”

“…Artisanal or small-scale fisheries are important worldwide contributing more than 25% of global marine landings (Food and Agriculture Organization of the United Nations, 2014), accounting for about 50% of the landings used as human food, and employing for 90% of the world's fishermen (McGoodwin, 1990;Dıaz-Uribe, 2007). Crab gill net is one of the most important fishing gear of blue swimming crab Portunus pelagicus (Linnaeus, 1758) in the Gulf of Thailand.…”