9 results on '"RENÁN, Ximena"'
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2. Age‐based life history of three groupers in the southern Gulf of Mexico.
- Author
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Renán, Ximena, Brulé, Thierry, Galindo‐Cortes, Gabriela, and Colás‐Marrufo, Teresa
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LIFE history theory , *GROUPERS , *STOCK prices , *FISH mortality , *FISHERY laws , *EPINEPHELUS - Abstract
The three most important grouper fishery species in southern Gulf of Mexico, Epinephelus morio, Mycteroperca bonaci and Mycteroperca microlepis, do not have life history parameters data reported such as growth, age and natural mortality essential to management. Individuals from the three species were captured in the Campeche Bank (CB) at different times from 1988 to 2001. Sagittae were thin‐sectioned to count annuli: n = 1081 for E. morio, n = 920 for M. bonaci and n = 251 for M. microlepis. Otoliths from the three species exhibited successive opaque and translucent bands deposited with an annual frequency, occurring between January and April for E. morio and M. bonaci, and between January and March for M. microlepis. Estimated age in the three grouper species ranged from 0+ to 20 years. The most frequent ages were 7–10 years for E. morio and 8–12 years for M. bonaci and M. microlepis. The von Bertallanfy Growth Function model parameters (L∞, K and t0) were consistent with reported growth patterns for Epinephelidae family species, as established by growth performance Ф' (near 3). The CB groupers appear to reach maximum ages over 13 years with K values between 0.09 and 0.12 year−1, indicating all three studied species displayed relatively slow growth rate and medium longevity. Lifespan values ranged from 13 to 33 years for E. morio, from 18 to 30 years for M. bonaci and from 17 to 33 years for M. microlepis. A50 was 6.1 years for E. morio and 5.5 years for both M. bonaci and M. microlepis. Age at which all females were mature was 8 years for M. bonaci and 10 years for E. morio and M. microlepis. P50 was 9.3 years for E. morio, 13.6 years for M. bonaci and 11.6 years for M. microlepis. Age at which 100% of individuals were male was 13 years for E. morio, 19 years for M. bonaci and 15 years for M. microlepis. Values of M at age exhibited an exponential decrease with age for all three species, but overall values were 0.13 year−1 for E. morio, 0.14 year−1 for M. bonaci and 0.17 year−1 for M. microlepis. For the three species size at age varied by geographical distribution area, but particularly for E. morio the discrepancy in average size between published studies may be the consequence of the fishing effort exerted on the stock and/or the lack of regulation for the fishery prior to 2001; after this stock biomass fell below the reference limit point and was declared overexploited. Resource managers could use the information provided in this study as a reference, representing pre‐overexploitation values, to evaluate the current status of these populations and ensure sustainable management actions for the CB grouper fisheries. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
3. Potential Impact of Climate Change on Fish Reproductive Phenology: A Case Study in Gonochoric and Hermaphrodite Commercially Important Species from the Southern Gulf of Mexico.
- Author
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Brulé, Thierry, Renán, Ximena, and Colás-Marrufo, Teresa
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CLIMATE change , *SEXUAL cycle , *SEX differentiation (Embryology) , *PHENOLOGY , *PLANT phenology - Abstract
In tropical regions, temperature is the fundamental environmental factor controlling the reproduction-related physiological activities of fish. Tropical fish are particularly sensitive to climate change since they develop in a relatively stable thermal environment. A review was done to assess the potential effect of temperature rise on reproduction and population structure in the commercially important hermaphrodite grouper and wrasse species, and in gonochoric snapper species in the southern Gulf of Mexico. Temperature increase can disturb the aromatase synthesis and/or activity, which can affect the reproductive cycle and sexual differentiation in all studied species and the sexual inversion process in sequential hermaphrodites. Moreover, a mistiming or discontinuity in spawning seasonality could occur, with an alteration in the sex ratio in favor of males and a consequent reduction in populations' fecundity. Furthermore, if the level of fishing exploitation enhances species' sensitivity to environmental changes, then the stock of red grouper Epinephelus morio would be more affected by temperature increases than other species because it is the only fish population in the Campeche Bank currently assessed as overexploited. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
4. Assessing the Speciation of Lutjanus campechanus and Lutjanus purpureus through Otolith Shape and Genetic Analyses.
- Author
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Marval-Rodríguez, Angel, Renán, Ximena, Galindo-Cortes, Gabriela, Acuña-Ramírez, Saraí, Jiménez-Badillo, María de Lourdes, Rodulfo, Hectorina, Montero-Muñoz, Jorge L., Brulé, Thierry, and De Donato, Marcos
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OTOLITHS , *GENETIC speciation , *MOLECULAR shapes , *GENETIC variation , *MITOCHONDRIAL DNA , *MORPHOMETRICS - Abstract
Based on their morphological and genetic similarity, several studies have proposed that Lutjanus campechanus and Lutjanus purpureus are the same species, but there is no confirmed consensus yet. A population-based study concerning otolith shape and genetic analyses was used to evaluate if L. campechanus and L. purpureus are the same species. Samples were collected from populations in the southwestern Gulf of Mexico and the Venezuelan Caribbean. Otolith shape was evaluated by traditional and outline-based geometric morphometrics. Genetic characterization was performed by sequencing the mtDNA control region and intron 8 of the nuclear gene FASD2. The otolith shape analysis did not indicate differences between species. A nested PERMANOVA identified differences in otolith shape for the nested population factor (fishing area) in morphometrics and shape indexes (p = 0.001) and otolith contour (WLT4 anterior zone, p = 0.005 and WLT4 posterodorsal zone, p = 0.002). An AMOVA found the genetic variation between geographic regions to be 10%, while intrapopulation variation was 90%. Network analysis identified an important connection between haplotypes from different regions. A phylogenetic analysis identified a monophyletic group formed by L. campechanus and L. purpureus, suggesting insufficient evolutionary distances between them. Both otolith shape and molecular analyses identified differences, not between the L. campechanus and L. purpureus species, but among their populations, suggesting that western Atlantic red snappers are experiencing a speciation process. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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5. Epinephelus morio Valenciennes, 1828 (Epinephelidae).
- Author
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RENÁN, Ximena, COLÁS-MARRUFO, Teresa, and BRULÉ, Thierry
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EPINEPHELUS , *ATLANTIC cod , *REEF fishes - Published
- 2023
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6. Age and Stock Analysis Using Otolith Shape in Gags from the Southern Gulf of Mexico.
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Renán, Ximena, Montero‐Muñoz, Jorge, Garza‐Pérez, Joaquin R., and Brulé, Thierry
- Abstract
On Campeche Bank (CB) in the southern Gulf of Mexico, GagsMycteroperca microlepisare captured as part of a sequential multispecies fishery. Limited scientific data suggest that the Gag is the third most important commercial species in the region, contributing 21% (total weight) of the overall grouper catch. Neither age nor stock data are currently available for Gags in this region, making it impossible to determine how this species is affected by current fishing practices. Such information is vital for the CB stock since it acts as a genetic source for a mixed Gag population on the west Florida shelf through a constant unidirectional flow of larvae. The goal of this study was to generate baseline age and stock structure data for Gags on CB. Age was quantified from otoliths by counting the number of annuli (indicated by the number of opaque zones from the otolith core to the margin) in thin sections. Otolith shape was analyzed by using discrete wavelet transforms, linear otolith morphometrics, and shape indices. In each of 198 specimens, age was determined based on examination of the right sagittal otolith, and shape analysis was conducted on the left sagittal otolith. Individual age ranged from 4 to 17 years, and otolith opaque band deposition occurred annually between December and February. Using principal components analysis and linear discriminant analysis, two distinct groups were identified (discrimination success = 98%), indicating the presence of substructure in the CB stock of Gags. Otolith analysis clearly assisted in achieving a better understanding of the CB Gag stock and in identifying the complexity within the stock, demonstrating that otolith analysis is a useful tool in characterizing fish populations. The study results highlight the urgent need for Gag stock assessment in this region and for the application of a cautious approach to fishery management given the immense gaps in biological data for this species. Received January 13, 2016; accepted July 18, 2016 Published online October 7, 2016 [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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7. Confirmation of functional hermaphroditism in six grouper species (Epinephelidae: Epinephelinae) from the Gulf of Mexico.
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BRULÉ, Thierry, CABALLERO-ARANGO, Doralice, RENÁN, Ximena, and COLÁS-MARRUFO, Teresa
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INTERSEXUALITY ,SYMPATRIC speciation ,BIOLOGICAL classification ,SPECIES hybridization - Abstract
Copyright of Cybium: International Journal of Ichthyology is the property of Societe Francaise d'Ichtyologie (SFI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
8. Growth stanzas in an Epinephelidae-Lutjanidae complex: considerations to length-weight relationships.
- Author
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Renán, Ximena, Trejo-Martínez, Jorge, Caballero-Arango, Doralice, and Brulé, Thierry
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LUTJANIDAE , *FISH growth , *GROWTH rate , *SEXUAL maturity in fishes , *LIFE spans - Abstract
Growth stanzas or abrupt changes in growth rates are present throughout the life span of fish. Identifying growth stanzas will help to adequately described growth taking into account that fishes are indeterminate growers. In this study, we used length-weight (L-W) relationships to analyze the growth stanzas in the Grouper-Snapper complex of Southern Gulf of Mexico. For this, the type of sexuality, sex and different sexual maturity phase were considered in the analyses of three species of gonochoric Snappers (Lutjanidae) and six species of protogynous hermaphrodite Groupers (Epinephelidae). Welch ANOVA tests were carried out to determine the existence of differences in length and weight between juveniles and adults per sex. According to the observed differences, L-W relationship parameters (a and b), standard error (SE b) and coefficients of determination (R²) were calculated for all species separately by sex and sexual maturity phase. Snappers' juvenile-females b-value ranged from 2.44-2.77, juvenile-males from 2.16-2.94, adult-females from 2.63-2.80 and adult-males from 2.63-2.98. Groupers' b-value ranged for juvenile-females 2.66-3.20, adult-females from 2.73-3.31 and for adult-males 2.93-3.29. For each relationship b-value was t-tested (t-Student) to explore differences from the allometric coefficient (b=3), which indicated changes in body form. Hypothesis test, for regression slopes (b) between Snappers' juvenile-females vs. adult-females and juvenile-males vs. adult-males and Groupers' juvenile-females vs. adult-females and adult-females vs. adult-males, indicated different growth stanzas related to gonadal development for Snappers, and to gonadal development and sex change in Groupers. The identification of growth stanzas is crucial to avoid an overestimation or misleading growth rate which is used in fisheries management to establish some target reference points, such as maximum sustainable yield or yield-per-recruit. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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9. DIET OF JUVENILE GAG MYCTEROPERCA MICROLEPIS FROM A NON-ESTUARINE SEAGRASS BED HABITAT IN THE SOUTHERN GULF OF MEXICO.
- Author
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Brulé, Thierry, Mena-Loría, Andy, Pérez-Déaz, Esperanza, and Renán, Ximena
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MARINE science research ,GAG (Fish) ,MYCTEROPERCA ,ANIMAL nutrition - Abstract
The article presents a study which evaluated diet composition in juvenile jag, Mycteroperca microlepsis from a nearshore open marine seagrass bed on the north coast of the Yucatán Peninsula. Percentage frequency of occurrence, percentage number, percentage weight, and a dietary index were used in analyzing stomach contents from 322 juveniles. It was found that diet composition and ontogenetic changes in juvenile diet were the same.
- Published
- 2011
- Full Text
- View/download PDF
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