A dataset of seasonal fluctuations of molluscan populations from the southern Gulf of California subtropical arid zone.

The dataset contains insights into the molluscan diversity associated with seagrass and seasonal dynamics in a subtropical arid zone in the southern Gulf of California. The dataset includes the number of species, taxonomy, seasonal abundance data, trophic composition, biomass of molluscan, and biomass of seagrass (). This dataset is referenced in the study titled: "Diversity and seasonal variation of the molluscan community associated with the seagrass in a marine protected area in the southern Gulf of California" (Pérez-Estrada et al.

Reproductive biology of the bullseye puffer Sphoeroides annulatus: Gonadosomatic index and its suitability for estimating length at maturity.

This study aimed to describe updated information on the basic reproductive biology of Sphoeroides annulatus females and potential use of the gonadosomatic index as input data to assess length at 50% maturity ( ) and identify the breeding season. From April 2014 to December 2015, 767 females were analysed along the north-west coast of the Mexican Pacific Ocean. Both immature and mature females were represented in the total length ( ), which ranged from 81 to 440 mm, and the smallest mature female was 92 mm (new record for the species).

Inference for a discretized stochastic logistic differential equation and its application to biological growth.

In this paper, we present a method to adjust a stochastic logistic differential equation (SLDE) to a set of highly sparse real data. We assume that the SLDE have two unknown parameters to be estimated. We calculate the Maximum Likelihood Estimator (MLE) to estimate the intrinsic growth rate.

Length at Maturity, Sex Ratio, and Proportions of Maturity of the Giant Electric Ray, , in Its Septentrional Distribution.

The size at which a certain fraction of a fish population reaches sexual maturity is an important parameter of life history. The estimation of this parameter based on logistic or sigmoid models could provide different ogives and values of length at maturity, which must be analyzed and considered as a basic feature of biological reproduction for the species. A total of 305 individuals of () were obtained from artisanal fisheries in the Bahía de La Paz, Mexico.

Improving the gnomonic approach with the R-package to estimate natural mortality throughout different life stages.

Natural mortality () is defined as the rate of loss that occurs in a fish stock due to natural (non-fishing) causes and can be influenced by density-dependent or density-independent factors. Different methods have been used to estimate , one of these is the gnomonic approach. This method estimates rates by dividing the life cycle of a species into subunits of time that increase as a constant proportion of the time elapsed from birth up to the initiation of each subdivision.

Evidence of overfishing of geoduck clam from a length-based stock assessment approach.

Stock assessment of the geoduck clam in Mexico has been based on data-poor without consideration of the biological traits of the species, promoting a passive management strategy without biological reference points for its harvest and conservation, which results in limited advice regarding the sustainability of the fishery. The stock assessment was supported on an integrated catch-at-size assessment model. The model described the population changes, including recruitment, selectivity, fishing mortality, individual growth patterns and survival over time, providing management quantities for the geoduck clam fishery, such as biomass-at-length (total and vulnerable) and harvest rate-at-length.

Seagrass as a new habitat for the amphioxus (Cephalochordata, Branchiostomidae) in the southern Gulf of California, Mexico.

The first record of the amphioxus on seagrass patches of in the Gulf of California is reported. Sixty individuals (19 males, 18 females, and 23 undifferentiated) were collected in May 2017 at Bahía Balandra, Gulf of California, from subtidal seagrass patches at a depth of 0.5 m at low tide.

Modeling the temporal periodicity of growth increments based on harmonic functions.

Age estimation methods based on hard structures require a process of validation to confirm the periodical pattern of growth marks. Among such processes, one of the most used is the marginal increment ratio (MIR), which was stated to follow a sinusoidal cycle in a population. Despite its utility, in most cases, its implementation has lacked robust statistical analysis.

Seasonal variations of biochemical, pigment, fatty acid, and sterol compositions in female Crassostrea corteziensis oysters in relation to the reproductive cycle.

Wild female Crassostrea corteziensis oyster (n=245) were analyzed over one year to understand the main ecophysiological events associated to gonad development. Different indicators (mainly biochemical) were analyzed to infer: i) utilization and accumulation of energy reserves (e.g.

Molecular analysis of bacterial microbiota associated with oysters (Crassostrea gigas and Crassostrea corteziensis) in different growth phases at two cultivation sites.

Microbiota presumably plays an essential role in inhibiting pathogen colonization and in the maintenance of health in oysters, but limited data exist concerning their different growth phases and conditions. We analyzed the bacterial microbiota composition of two commercial oysters: Crassostrea gigas and Crassostrea corteziensis. Differences in microbiota were assayed in three growth phases: post-larvae at the hatchery, juvenile, and adult at two grow-out cultivation sites.