scholarly journals Spatial dynamics of the red grouper Epinephelus morio (Pisces: Serranidae) on the Campeche Bank, Gulf of Mexico

2013 ◽  
Vol 77 (2) ◽  
pp. 313-322 ◽  
Author(s):  
Jorge A. López-Rocha ◽  
Francisco Arreguín-Sánchez
Keyword(s):  
Gulf Of Mexico ◽  
Spatial Dynamics ◽  
Epinephelus Morio ◽  
Red Grouper

scholarly journals Modeling Discards in Stock Assessments: Red Grouper Epinephelus morio in the U.S. Gulf of Mexico

Fishes ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 7
Author(s):  
Kyle W. Shertzer ◽  
Erik H. Williams ◽  
Skyler R. Sagarese
Keyword(s):  
Gulf Of Mexico ◽  
Stock Assessment ◽  
Time Varying ◽  
Discard Mortality ◽  
Stock Assessments ◽  
Epinephelus Morio ◽  
Red Grouper ◽  
Management Advice ◽  
The U.S

To be as accurate as possible, stock assessments should account for discard mortality in fisheries if it occurs. Three common approaches to modeling discards in assessments are to lump dead discards with landings, treat dead discards as their own fleet, or link them conversely with landings through use of a retention function. The first approach (lumping) implicitly assumes that the selectivity of landings applies also to discards. In many cases, that assumption is false, for example, if discards comprise smaller fish than do landings. The latter two approaches avoid the assumption by modeling discards explicitly with their own selectivity pattern. Here, we examine these approaches to modeling discards. Using a simulation study, we demonstrate that the two approaches to modeling discards explicitly can provide identical results under both static and time-varying conditions. Then, using a stock assessment case study of red grouper Epinephelus morio in the U.S. Gulf of Mexico, we demonstrate that in practice the approaches to modeling discards can provide different outcomes, with implications for the resultant management advice. We conclude by comparing and contrasting the different approaches, calling for more research to elucidate which approach is most suitable under various sources of error typically encountered in discard data.

Ontogenetic spatial distributions of red grouper (Epinephelus morio) and gag grouper (Mycteroperca microlepis) in the U.S. Gulf of Mexico

2017 ◽  
Vol 193 ◽  
pp. 129-142 ◽  
Author(s):  
Arnaud Grüss ◽  
James T. Thorson ◽  
Skyler R. Sagarese ◽  
Elizabeth A. Babcock ◽  
Mandy Karnauskas ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Spatial Distributions ◽  
Epinephelus Morio ◽  
Red Grouper ◽  
Gag Grouper ◽  
The U.S ◽  
Mycteroperca Microlepis

scholarly journals Benthic Habitat Modification through Excavation by Red Grouper, Epinephelus morio, in the Northeastern Gulf of Mexico

2010 ◽  
Vol 3 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Felicia C. Coleman ◽  
Christopher C. Koenig ◽  
Kathryn M. Scanlon ◽  
Scott Heppell ◽  
Selina Heppell ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Habitat Modification ◽  
Benthic Habitat ◽  
Epinephelus Morio ◽  
Red Grouper ◽  
Northeastern Gulf Of Mexico

scholarly journals TEMPORAL VARIATION IN THE RED GROUPER, EPINEPHELUS MORIO, DEMOGRAPHIC STRUCTURE FROM SOUTHERN GULF OF MEXICO

2010 ◽  
Vol 2 ◽  
pp. 39
Author(s):  
Doralice Caballero-Arango ◽  
Thierry Brule ◽  
Jorge L. Montero-Muño ◽  
Teresa Colás-Marrufo
Keyword(s):  
Gulf Of Mexico ◽  
Sex Ratios ◽  
Demographic Structure ◽  
Size Frequency Distribution ◽  
Frequency Distributions ◽  
Size Frequency ◽  
Epinephelus Morio ◽  
Red Grouper ◽  
Bank Stock ◽  
Dependent Samples

Changes in the demographic structure of red grouper Epinephelus morio from the southern part of the Gulf of Mexico, were evaluated during periods when total catches, CPUE and annual yields of the specie decreased. Fishery-dependent samples (n = 1887) were obtained between August 1989 and February 2004 from the Campeche Bank, and size-frequency distributions by sex, sex ratios and sizes of sexual maturation and sex change were compared between three periods: P11989-1992 (n = 886); P21996-1998 (n = 413); and P32003-2004 (n = 588). The temporal stability of size-frequency distribution by sex, with males always being larger than females, and the sex ratios always biased towards females, were consistent with this species’ type of sexuality. Size for females and males, as well as sizes at first sexual maturity and at sex reversal all decreased from the oldest period to the more recent one and could be a consequence of the fishing intensity applied to this stock. The reductions in size of females and males associated with a relatively stable sex ratio and the lack of any drastic decrease in the number of males can be explained by this species’ reproductive ecology. Results are discussed regarding the capacity for reproductive resilience of red grouper in response to fishing pressure like that currently experienced by the Campeche Bank stock.

Estimating natural mortality rates and simulating fishing scenarios for Gulf of Mexico red grouper (Epinephelus morio) using the ecosystem model OSMOSE-WFS

2016 ◽  
Vol 154 ◽  
pp. 264-279 ◽  
Author(s):  
Arnaud Grüss ◽  
Michael J. Schirripa ◽  
David Chagaris ◽  
Laure Velez ◽  
Yunne-Jai Shin ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Ecosystem Model ◽  
Mortality Rates ◽  
Natural Mortality ◽  
Epinephelus Morio ◽  
Red Grouper

New philometrids (Nematoda, Philometridae) from head tissues of two serranid fishes (Epinephelus morio and Mycteroperca microlepis) off Florida, northern Gulf of Mexico

2010 ◽  
Vol 55 (4) ◽  
Author(s):  
František Moravec ◽  
Micah Bakenhaster ◽  
Emma Fajer-Avila
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Northern Gulf Of Mexico ◽  
Mouth Cavity ◽  
Epinephelus Morio ◽  
Red Grouper ◽  
Subcutaneous Tissues ◽  
Gravid Females ◽  
Microscopy Examination ◽  
Mycteroperca Microlepis

AbstractA new species of nematode, Philometra morii sp. nov. (Philometridae), is described from males and gravid females collected from the mouth cavity of the red grouper, Epinephelus morio (Valenciennes) (Serranidae, Perciformes), from the northen Gulf of Mexico, off Florida, USA. The new species is characterized mainly by the length of spicules (84–90 and 72–87 μm) and the length (54 μm) and structure of the gubernaculum in the male, and by the presence of three large oesophageal teeth protruding from the mouth, the number and arrangement of small cephalic papillae (8 papillae in 4 pairs of external circle and 6 single papillae of internal circle), the length (1.09–1.50 mm) and structure of the oesophagus and two large papilla-like caudal projections, and by the length of their bodies (19.34–30.07 mm). Philometra morii is the third species of this genus reported from E. morio in the Gulf of Mexico, differing from the two previously described species, in addition to morphological features, by the site of infection in this host (mouth cavity and sinuses vs oculo-orbits or gonads). From the same region (northern Gulf of Mexico, off Florida), gravid females of Philometra Costa, 1845, morphologically and biometrically similar to those of P. morii, were found in the subcutaneous tissues and sinuses of the head of another serranid fish (gag), Mycteroperca microlepis (Good et Bean). Although their conspecificity with P. morii cannot be excluded, they have been designated as Philometra sp. until conspecific males are discovered and described. Based on light and scanning electron microscopy examination (latter used only for females), both these forms are described.

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