scholarly journals Site fidelity, residence time and movements of red snapper Lutjanus campechanus estimated with long-term acoustic monitoring

2011 ◽  
Vol 437 ◽  
pp. 183-200 ◽  
Author(s):  
DT Topping ◽  
ST Szedlmayer
Keyword(s):  
Residence Time ◽  
Site Fidelity ◽  
Acoustic Monitoring ◽  
Red Snapper ◽  
Lutjanus Campechanus

Red Snapper: Ecology and Fisheries in the U.S. Gulf of Mexico

2007 ◽  
Keyword(s):  
Gulf Of Mexico ◽  
Site Fidelity ◽  
Oil And Gas ◽  
Recovery Period ◽  
Red Snapper ◽  
Lutjanus Campechanus ◽  
Habitat Value ◽  
Release Location ◽  
Petroleum Platforms

<em>Abstract.</em>—The habitat value of petroleum platforms for red snapper, <em>Lutjanus campechanus</em>, is poorly understood. However, it is widely recognized that the presence of thousands of platforms in the northern Gulf of Mexico (GOM) has affected the distribution of red snapper by the addition of hard substrate habitat. We evaluated the habitat value of petroleum platforms by monitoring the fidelity of red snapper to these structures with acoustic telemetry. In May 2003, 125 red snapper were captured with hook and line at several platforms in a 35-km<sup>2</sup> portion of the South Timbalier oil and gas lease blocks, 50 km south of Port Fourchon, Louisiana. Following anaesthetization with MS-222, an individually coded acoustic pinger was surgically implanted into the peritoneal cavity of each specimen. After a short recovery period fish were released at five platforms in the study area. Presence of individual snapper was recorded with omnidirectional acoustic receivers attached to eight platforms. Red snapper exhibited little movement among platforms in the study area; however, logistic regression showed a high initial fidelity to release location which subsequently decreased over time. Therefore, site fidelity was estimated to be high in the short-term, but much lower in the long-term. However, study results were confounded by tag detection issues that may have resulted in long-term site fidelity being underestimated. Overall, estimates provided of red snapper fidelity to petroleum platforms should lead to more effective management of this species by adding to the knowledge of the function of platforms as habitat and their importance to the GOM red snapper population.

Red Snapper: Ecology and Fisheries in the U.S. Gulf of Mexico

2007 ◽  
Keyword(s):  
Reef Fish ◽  
Growth Rates ◽  
Site Fidelity ◽  
Standing Stock ◽  
Artificial Reef ◽  
Red Snapper ◽  
Artificial Reefs ◽  
Suitable Habitat ◽  
Fish Biomass ◽  
Lutjanus Campechanus

<em>Abstract.</em>—Red snapper, <em>Lutjanus campechanus</em>, (<em>n </em>= 4,317) were captured and tagged at 14 experimental artificial reefs of two designs during quarterly research cruises (<em>n </em>= 17) off coastal Alabama between January 1999 and October 2002. Six-hundred and twenty nine recaptures were reported, representing 578 tagged red snapper. Sixty-five percent of recaptures (<em>n </em>= 412) were made at the site of release on subsequent research cruises, while 217 recaptures were reported by fishers. Eighty-six percent of individuals with known recapture locations moved 2 km or less from the site of release; mean and maximum distances moved were 2.1 km and 201 km, respectively. Nine red snapper moved greater than 80 km. Mean dispersion rate from release sites was 8.6 m d<sup>⁻1</sup>. Annual site fidelity of tagged fish was estimated using nonlinear decay models. Estimated annual site fidelity ranged from 48% to 52% year<sup>⁻1</sup> and was not significantly affected by artificial reef design, reef fish biomass at the site of release, or artificial reef densities surrounding each tagging site. Growth rates were estimated by regressing the change in red snapper total length versus the days a fish was at liberty. Mean growth rate for all recaptured fish was 0.206 mm d<sup>⁻1</sup>. Growth rates were significantly affected by reef size (faster at larger experimental reefs) and reef fish biomass (slower at tagging sites supporting low reef fish biomass), but were not affected by artificial reef density. Moderate site fidelity and low dispersion rates during our study provide support for the hypothesis that artificial reefs off Alabama are suitable habitat for adult red snapper. However, characteristics of artificial reefs, such as reef size and standing stock biomass, may affect red snapper growth. Furthermore, ratios of instantaneous growth in weight to total mortality (<EM>G/Z</EM>) suggest artificial reefs off Alabama serve as net sinks (i.e., <EM>G/Z </EM>< 1) of red snapper biomass under current fishing mortality rates.

Red Snapper: Ecology and Fisheries in the U.S. Gulf of Mexico

2007 ◽  
Keyword(s):  
Gulf Of Mexico ◽  
Site Fidelity ◽  
Habitat Type ◽  
The Other ◽  
Red Snapper ◽  
Lutjanus Campechanus ◽  
Daily Growth ◽  
Fish Movements ◽  
Location Data ◽  
The U.S

<em>Abstract.</em>—Site fidelity and movements of red snapper <em>Lutjanus campechanus </em>off the coast of Texas were estimated from two tagging programs conducted aboard recreational boats. In one program, we tagged 5,614 red snapper at over 200 fishing sites between July 2002 and August 2005 using hook-and-line gear; fishermen and others reported 130 recaptured fish (a 2.3% return rate), 82 of which included location data. About 54% of the recaptured fish had moved, with an average movement of 20.4 km. In the other program, over 9,000 fish were tagged between 1983 and 2006, but only 68 records of fish tagged between 1986 and 2000 could be analyzed due to computer problems. Of the recaptured fish, 60 could be analyzed for movement, and 17 fish (28%) had moved an average of 19.1 km. Important predictors of movement in at least one program or analysis were depth, habitat type, isolation of the initial capture location, time at liberty, and fish size. Red snapper showed a higher probability of movement from capture sites that were in deep water (>40 m), natural rather than artificial structures, and isolated from other sites rather than clustered. Differences in movement from natural versus artificial sites may have been related to red snapper ‘sub-cohort’ behavior, (the tendency of small groups of red snapper to associate together), as the majority of fish that moved were members of sub-cohorts. Larger fish had a higher probability of movement than smaller fish. In one program, fish movements increased with increasing time at liberty, which is similar to past studies on red snapper site fidelity. In the other program, movements decreased with increasing time at liberty, but this was probably a bias caused by the spatial and temporal scale of the recapture effort. Red snapper that moved showed a higher average daily growth rate between capture and recapture than fish that were stationary, suggesting that movements may be beneficial for red snapper. The spatial scale of fish movements in this study, although larger than in other studies without hurricanes or translocation of fish, was still small enough to support the idea that red snapper populations in the northern Gulf of Mexico are relatively isolated, and that there may be a separate demographic stock off Texas.

scholarly journals Long-term individual foraging site fidelity—why some gannets don't change their spots

Ecology ◽  
2015 ◽  
Vol 96 (11) ◽  
pp. 3058-3074 ◽  
Author(s):  
Ewan D. Wakefield ◽  
Ian R. Cleasby ◽  
Stuart Bearhop ◽  
Thomas W. Bodey ◽  
Rachel D. Davies ◽  
...  
Keyword(s):  
Site Fidelity ◽  
Foraging Site

Spawning of Red Snapper (Lutjanus campechanus) in Response to Hormonal Induction or Environmental Control in a Hatchery Setting

2009 ◽  
Vol 17 (2) ◽  
pp. 149-155 ◽  
Author(s):  
R. P. Phelps ◽  
N. Papanikos ◽  
B. D. Bourque ◽  
F. T. Bueno ◽  
R. P. Hastey ◽  
...  
Keyword(s):  
Environmental Control ◽  
Red Snapper ◽  
Lutjanus Campechanus ◽  
Hormonal Induction

Mathematical modeling of fluid movement inside the eyeball during intravitreal injection

2021 ◽  
pp. 106-109
Author(s):  
D.V. Lipatov ◽  
◽  
S.A. Skladchikov ◽  
N.P. Savenkova ◽  
V.V. Novoderezkin ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Residence Time ◽  
Complex Structure ◽  
Posterior Vitreous Detachment ◽  
Vitreous Body ◽  
Complete Removal ◽  
Intravitreal Injections ◽  
The World

Background. The avalanche-like growth of intravitreal injections in the world has significantly increased interest in the hemodynamics of the processes that occur in the eye when a drug is injected into the vitreous cavity. Every year, the number of intravitreally used drugs and promising areas in which they can be used is growing. This also applies to the creation of new combined medicines and the development of drugs with a long-term therapeutic effect. Aims. Create mathematical model of eyeball to evaluate the movement of the drug substance in it; to estimate the time of the drug's presence in the eye cavity before its complete removal, to characterize the ways of its removal from the eye cavity; to assess the significance of posterior vitreous detachment during the time when the drug is present in the eye cavity; to evaluate the effect on the hydrodynamics of the depth of drug administration. Results. When the drug is administered closer to the center of the eyeball, its residence time increases in comparison with the parietal administration. With a complete posterior detachment of the vitreous body, the time of finding the drug in the eye is prolonged compared to its absence. The obtained results of mathematical modeling of the movement of the drug administered intravitreally cannot be mechanically transferred to the human eye, due to the more complex structure of the latter. Key words: intravitreal injections, vitreous body, mathematic computing.

Detection and residence time of bisphosphonates in bone of horses

2021 ◽  
Vol 34 (1) ◽  
pp. 23-27
Author(s):  
Heather K. Knych ◽  
Jennifer Janes ◽  
Laura Kennedy ◽  
Daniel S. McKemie ◽  
Rick M. Arthur ◽  
...  
Keyword(s):  
Synovial Fluid ◽  
Residence Time ◽  
Bone Fractures ◽  
Limited Information ◽  
Long Term Effects ◽  
Normal Bone ◽  
Postmortem Blood ◽  
Affect Bone Healing ◽  
Postmortem Sample

Bisphosphonates are potent anti-resorptive agents that have the potential to adversely affect bone healing in equine athletes, and normal bone adaption in young racehorses. A concern exists that bisphosphonate inhibition of normal bone metabolism could lead to increased bone fractures during high-intensity exercise. We found only a single report describing concentrations of tiludronate in the bone of horses, and no studies describing clodronate. Knowledge of the residence time in bone could allow for a better understanding of the long-term effects of these compounds. Our objectives were to develop a method for detection of bisphosphonates in bone and add to the limited information available regarding the disposition of these drugs in the bone of horses. Two horses received clodronate and 2 tiludronate disodium. Postmortem collection of bones and teeth occurred either 4 or 30 d post drug administration. Additionally, postmortem blood, synovial fluid, aqueous humor, and bone samples from racehorses with various histories of bisphosphonate administration were collected, and concentrations determined using the developed LC-MS/MS method. Bisphosphonates were detected in bones and teeth tested at 4 and 30 d. In a postmortem sample, clodronate was detected in bone from a horse with reported administration 18 mo prior; clodronate was not detected in other sample types collected from this horse. Bisphosphonates reside in bone for extended periods of time, which could lead to potential long-term effects, increasing the potential for bone fractures in young and/or athletic horses.

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