A Comparison of Size Structure, Age, and Growth of Red Snapper from Artificial and Natural Habitats in the Western Gulf of Mexico

2017 ◽  
Vol 146 (4) ◽  
pp. 762-777 ◽  
Author(s):  
Matthew K. Streich ◽  
Matthew J. Ajemian ◽  
Jennifer J. Wetz ◽  
Jason A. Williams ◽  
J. Brooke Shipley ◽  
...  

<em>Abstract.</em>—The red snapper, <em>Lutjanus campechanus</em>, is one of the most economically important fish species in the Gulf of Mexico (GOM). Concerns over the declines in red snapper landings during the 1980s in the GOM exposed the paucity of information regarding the species’ age, growth, and population dynamics, all fundamental in fisheries management. This paper reviews the history of red snapper age and growth research in the GOM demonstrating an evolution of fisheries aging and validation techniques. These refinements in aging over time have also impacted management of the red snapper stock in the GOM. Also discussed are efforts to standardize aging techniques throughout the GOM in an effort to improve data accuracy. A number of studies have used the von Bertalanffy growth model to describe a pattern of rapid growth followed by slower growth after the age of ten years for red snapper in the GOM. Additional applications of the von Bertalanffy growth model have also been applied to corroborate red snapper age estimates derived from sectioned otoliths and to discern demographic differences in red snapper growth throughout the GOM.


2019 ◽  
Vol 70 (12) ◽  
pp. 1768 ◽  
Author(s):  
Allen H. Andrews ◽  
Christiane Yeman ◽  
Caroline Welte ◽  
Bodo Hattendorf ◽  
Lukas Wacker ◽  
...  

Bomb-produced 14C has been used to make valid estimates of age for various marine organisms for 25 years, but fish ages that lead to birth years earlier than the period of increase in 14C lose their time specificity. As a result, bomb 14C dating is limited to a minimum age from the last year of prebomb levels because the temporal variation in 14C in the marine surface layer is negligible for decades before c. 1958. The longevity of red snapper (Lutjanus campechanus) in the Gulf of Mexico remains unresolved despite various forms of support for ages near 50–60 years. Although the age and growth of red snapper have been verified or validated to a limited extent, some scepticism remains about longevity estimates that exceed 30 years. In this study, red snapper otoliths were analysed for 14C using a novel laser ablation–accelerator mass spectrometry technique to provide a continuous record of 14C uptake. This approach provided a basis for age validation that extends beyond the normal limits of bomb 14C dating with confirmation of a 60-year longevity for red snapper in the Gulf of Mexico.


2014 ◽  
Vol 112 (4) ◽  
pp. 261-273 ◽  
Author(s):  
Courtney R. Saari ◽  
James H. Cowan Jr. ◽  
Kevin M. Boswell

2017 ◽  
Vol 9 (1) ◽  
pp. 50-67 ◽  
Author(s):  
Mandy Karnauskas ◽  
John F. Walter ◽  
Matthew D. Campbell ◽  
Adam G. Pollack ◽  
J. Marcus Drymon ◽  
...  

<em>Abstract</em>.—Identifying morphometrics, age composition, and growth of Red Snapper <em>Lutjanus campechanus </em>(Poey, 1860) in the Gulf of Mexico is crucial for management of this valuable species. Red Snapper are highly associated with artificial reefs situated off the coast of Texas. Artificial reefs, two in federal waters (offshore) and two in state waters (inshore), were sampled quarterly from December 2014 through December 2016. Characteristic differences in age and growth patterns at inshore and offshore sites and across sampled sites were compared. Mean ± standard deviation was calculated for total length (TL), weight, and biological age. Red Snapper collected averaged 464.5 ± 92.6 mm in TL, 1.62 ± 1.03 kg, and 3.8 ± 1.5 years. Significant differences in TL, weight, and age were observed across sites but not between inshore and offshore locations. In comparing 12 previous Red Snapper length-at-age (0–25 years) studies across the Gulf of Mexico, results were similar except for two studies significantly different from one another, but none with respect to our study. Our findings suggest that Red Snapper populations are young and restricted to one or two spawning years before capture on artificial reefs. Continued management of fisheries associated with these reefs are necessary to increase the stock and eventually lead to robust and sustainable fisheries.


2021 ◽  
Author(s):  
Patrick M. Graham ◽  
James S. Franks ◽  
Evan J. Anderson ◽  
Robert T. Leaf ◽  
Jason D. Tilley

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