The Bahía Magdalena lagoon complex (BMLC) is an extremely productive and biologically diverse embayment on the Pacific coast of Baja California Sur, Mexico, and one of the most important fishing ports in the state. Local hydrologic conditions are largely determined by the differential influence of the California Current and California Countercurrent, with upwelling also affecting the physical characteristics of west–central Bahía Magdalena. Because of its subtropical location and variable hydrology, the BMLC is considered a transitional zone between temperate and tropical faunal regions. Tropical species are dominant among most taxa, especially in Bahía Almejas, but species composition is highly variable and coupled with environmental conditions.

The vermilion rockfish (Sebastes miniatus) is part of an extended group of fish species named rockcods or rockfishes that are distributed in waters of the Californias. This species is a common and popular fish caught by the commercial and recreational fishers. This study shows the results of the vermilion rockfish monitoring from the recreational fishing at San Quintín, Baja California, México during 2005. A total of 71 boats were counted from one-day (Saturday) monthly visits, and a total of 1,026 vermilion rockfish was registered, 60.4% of those were measured and weighed. Catches were highest during April (25.9 ± 3.7 SE vermilions per boat), lowest (5.8 ± 3.9 SE) in November and for the overall year averaged 14.5 ± 1.3 SE. The sizes of vermilions rockfish were from 240 mm TL caught in November, and the biggest (680 mm TL) in December; the annual mean size was 448 mm TL (±2.4 mm SE). The recreational fishing at San Quintín, B.C. targeted almost all adult vermilion rockfishes, with only five individuals, of those measured, under the first maturity size (310 mm TL).

In 2004, the organophosphorus pesticide, diazinon, was phased-out for all residential uses in the United States. The objective of this study was to determine the temporal trend of diazinon levels in the Chollas Creek, CA watershed since the phase-out of this pesticide. Stormwater samples from Chollas Creek were collected during seven storm events in 2006–2007. The median diazinon level for all samples was 0.13 µg/L. Statistical analysis using the Kruskal-Wallis test revealed no statistically significant (p=0.765) spatial difference among any of the sampling sites. Correlational analysis (using the Spearman's rho test) revealed that there was no significant association between antecedent dry days and median diazinon levels (p=0.383, rho=0.393). Additionally, no association between storm event precipitation (p=0.355, rho=−0.414), median storm event intensity (p=0.585, rho=−0.252), or annual cumulative precipitation (p=0.760, rho=0.143) was observed. Trend analysis of diazinon levels (1998–2005) showed that levels in this watershed have declined with a negative slope of 0.0002 µg/L per year, and statistical analysis (using the Mann-Whitney U test) showed there was a significant decline in levels after the pesticide's phase-out in 2004 (p<0.05).