Estimación de la edad en que las hembras de anguila (A. anguilla) de la Albufera de Valencia realizan su migración reproductiva

ONE-HUNDRED AND TWENTY EUROPEAN EEL FEMALES WERE CAPTURED IN THEIR REPRODUCTIVE MIGRATION FROM THE ALBUFERA LAGOON (VALENCIA, SPAIN). OTOLITHS WERE EXTRACTED AND PROCESSED, AND MEAN FEMALES AGE, 9.09±0.17 YEARS, WAS DETERMINED BY COUNTING ANNUAL OTOLITH RINGS. FEMALES SHOWED MORPHOMETRIC PARAMETERS SIMILAR TO THOSE DESCRIBED IN MIGRATORY FISH FROM OTHER POPULATIONS. ALBUFERA EELS SHOWED A HIGHER GROWTH RATE THAN OTHER POPULATIONS FROM THE NORTH OF EUROPE. THIS KIND OF RESULTS MUST BE CONSIDERED FOR THE ESTABLISHMENT OF MANAGEMENT PLANS OF THIS SPECIES

Estimación de la edad en que las hembras de anguila (A. anguilla) de la Albufera de Valencia realizan su migración reproductiva

ONE-HUNDRED AND TWENTY EUROPEAN EEL FEMALES WERE CAPTURED IN THEIR REPRODUCTIVE MIGRATION FROM THE ALBUFERA LAGOON (VALENCIA, SPAIN). OTOLITHS WERE EXTRACTED AND PROCESSED, AND MEAN FEMALES AGE, 9.09±0.17 YEARS, WAS DETERMINED BY COUNTING ANNUAL OTOLITH RINGS. FEMALES SHOWED MORPHOMETRIC PARAMETERS SIMILAR TO THOSE DESCRIBED IN MIGRATORY FISH FROM OTHER POPULATIONS. ALBUFERA EELS SHOWED A HIGHER GROWTH RATE THAN OTHER POPULATIONS FROM THE NORTH OF EUROPE. THIS KIND OF RESULTS MUST BE CONSIDERED FOR THE ESTABLISHMENT OF MANAGEMENT PLANS OF THIS SPECIES

LADES: a software for constructing and analyzing longitudinal designs in biomedical research.

One of the most important steps in biomedical longitudinal studies is choosing a good experimental design that can provide high accuracy in the analysis of results with a minimum sample size. Several methods for constructing efficient longitudinal designs have been developed based on power analysis and the statistical model used for analyzing the final results. However, development of this technology is not available to practitioners through user-friendly software. In this paper we introduce LADES (Longitudinal Analysis and Design of Experiments Software) as an alternative and easy-to-use tool for conducting longitudinal analysis and constructing efficient longitudinal designs. LADES incorporates methods for creating cost-efficient longitudinal designs, unequal longitudinal designs, and simple longitudinal designs. In addition, LADES includes different methods for analyzing longitudinal data such as linear mixed models, generalized estimating equations, among others. A study of European eels is reanalyzed in order to show LADES capabilities. Three treatments contained in three aquariums with five eels each were analyzed. Data were collected from 0 up to the 12th week post treatment for all the eels (complete design). The response under evaluation is sperm volume. A linear mixed model was fitted to the results using LADES. The complete design had a power of 88.7% using 15 eels. With LADES we propose the use of an unequal design with only 14 eels and 89.5% efficiency. LADES was developed as a powerful and simple tool to promote the use of statistical methods for analyzing and creating longitudinal experiments in biomedical research

Effects of a diet lacking hufa on lipid and fatty acid content of intestine and gills of male gilthead seabream (Sparus aurata L.) broodstock at different stages of the reproductive cycle

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