Abstract
Within the buffer zone of the Upper Gulf of California and Colorado River Delta Biosphere Reserve (established June 1993), the shrimp fishery is managed as a common and rational use resource, trying to minize the impact of fishing effort on both the resource and ecosystem. An analysis was thus made of potential catch quotas of Litopenaeus stylirostris using a dynamic model to estimate expected shrimp yield and future biomass that includes fishing season as a factor and catch per unit effort (CPUE) as abundance index. The CPUE of L. stylirostris declined in the 1990/91 season and tended to recover in 1995/96. The parameters of the biomass dynamic model were K = 21,323 t (±700 t, P < 0.05) and r = 1.18 (±0.1, P < 0.05). The estimated catchability was 0.00032 with a standard deviation of 0.25. Biomass was projected under three catch quota scenarios in the study area. Given the usefulness of establishing an annual catch limit for available biomass in the management of this resource, based on the scenarios analyzed, the adoption of quotas of 2200 and 2400 t for one fishing season is recommended, after which the effectiveness of this strategy should be assessed.
Highlights
Four species of penaeid shrimp are exploited in the Mexican Pacific: blue shrimp Litopenaeus stylirostris (Stimpson 1874), white shrimp L. vannamei (Boone 1931), brown shrimp Farfantepenaeus californiensis (Holmes 1900), and crystal or red shrimp F. brevirostris (Kingsley 1878)
Analysis of the captura por unidad de esfuerzo (CPUE) trend indicated a positive recovery for this index, which allows the assumption of a recovery in abundance if one considers that CPUE is proportional to abundance
Our results show that the carrying capacity for L. stylirostris is K = 21,323 t, and the intrinsic rate of population growth is r = 1.18
Summary
Four species of penaeid shrimp are exploited in the Mexican Pacific: blue shrimp Litopenaeus stylirostris (Stimpson 1874), white shrimp L. vannamei (Boone 1931), brown shrimp Farfantepenaeus californiensis (Holmes 1900), and crystal or red shrimp F. brevirostris (Kingsley 1878). They represent 70% of the national shrimp production, but only two of them are found in the Upper Gulf of California (UGC): blue and brown shrimp (Rodríguez de la Cruz 1981). The explicit objectives of the reserve are: (1) to preserve the ecosystems of the Sonoran Desert, the UGC, and the Colorado River Delta; (2) to provide permanent protection to unique species such as the totoaba, the Mexican porpoise called vaquita marina, the desert pupfish, and several bird species; (3) to regulate productive activities for the protection of natural resources; (4) to promote alternative economic activities to improve the quality of life of the resident population; (5) to advance scientific research and environmental education in the region; and (6) to recover and preserve the flora and fauna, as well as the environmental quality (Diario Oficial de la Federación, 10 June 1993)
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