Effect of trawling on juvenile red snapper (Lutjanus campechanus) habitat selection and life history parameters

2008 ◽  
Vol 65 (11) ◽  
pp. 2399-2411 ◽  
Author(s):  
R. J. David Wells ◽  
James H. Cowan, ◽  
William F. Patterson ◽  
Carl J. Walters
Keyword(s):  
Life History ◽  
Red Snapper ◽  
Lutjanus Campechanus ◽  
Daily Growth ◽  
Life History Parameters ◽  
Probability Of Survival ◽  
Natural Reef ◽  
Mortality Estimates ◽  
Lower Production ◽  
Ontogenetic Habitat Shifts

This study documents ontogenetic habitat shifts of red snapper ( Lutjanus campechanus ) and highlights possible impacts of shrimp trawling on age-0 fish life history parameters on the northern Gulf of Mexico (GOM) continental shelf. Red snapper were collected quarterly during 2004 and 2005 over sand, low-relief shell rubble, high-relief shell rubble, and natural high-relief reef habitats within a de facto nontrawl area and in similar habitats on the open shelf where commercial shrimp trawling occurred. Age-0 red snapper were most dense over sand and low-relief shell rubble habitats and moved to higher-relief shell rubble and natural reef habitats by age-1. Habitat-specific daily growth rates of age-0 fish were highest over sand (range 0.65–1.03 mm·day–1). Densities of age-0 red snapper were highest over trawled sand, but higher over nontrawled shell rubble by 6 months of age (age-0.5+). Red snapper collected over sand and low-relief shell rubble areas exposed to trawling had truncated size distributions, higher mortality estimates, and lower production potential (the latter evaluated with G–Z and P–B ratios) compared with fish over nontrawled areas of similar habitat. Results suggest that juvenile red snapper residing over nontrawled areas may have a higher probability of survival than fish in areas exposed to commercial shrimp trawling.

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.

A Bayesian approach for overcoming inconsistencies in mortality estimates using, as an example, data for Acanthopagrus latus

2004 ◽  
Vol 61 (7) ◽  
pp. 1202-1211 ◽  
Author(s):  
Norman G Hall ◽  
S Alex Hesp ◽  
Ian C Potter
Keyword(s):  
Life History ◽  
Bayesian Approach ◽  
Growth Parameters ◽  
Probability Distributions ◽  
Total Mortality ◽  
Growth Parameter ◽  
Life History Parameters ◽  
Acanthopagrus Latus ◽  
Marine Embayment ◽  
Mortality Estimates

Reliable estimates of natural (M) and total mortality (Z) are essential for effective fisheries management. However, estimates of M, which are frequently determined from life history parameters, are imprecise and often inconsistent with the values of Z derived from life history parameters and other analyses. This is exemplified by the mortality estimates derived for Acanthopagrus latus in a large marine embayment. Thus, such estimates, calculated for M for this population from a growth parameter and from growth parameters and water temperature, were both 0.70·year–1, whereas those for Z, calculated from maximum recorded age, relative abundance analysis, and a simulation based on maximum age and sample size, ranged from 0.18 to 0.30·year–1. These results are clearly inconsistent. A Bayesian approach was therefore developed that combines the posterior probability distributions of the various mortality estimates and thereby produces integrated and consistent estimates for M and Z. The application of our Bayesian approach to the data for A. latus yielded lower values for M than for Z. Our approach is equally applicable to other fish species.

Fine-scale behavior of red snapper (Lutjanus campechanus) around bait: approach distances, bait plume dynamics, and effective fishing area

2021 ◽  
Author(s):  
Nathan M. Bacheler ◽  
Brendan J. Runde ◽  
Kyle W. Shertzer ◽  
Jeffrey A Buckel ◽  
Paul J. Rudershausen
Keyword(s):  
North Carolina ◽  
Red Snapper ◽  
Fine Scale ◽  
Sensory Cues ◽  
Lutjanus Campechanus ◽  
Reef Site ◽  
Natural Reef ◽  
Other Information ◽  
Scale Behavior ◽  
Fishing Area

The behavior of fish around bait is poorly understood despite it being important for the fish catching process and estimating relative abundance. We used a fine-scale acoustic positioning system to quantify the movements of 26 red snapper (Lutjanus campechanus) around 120 bait deployments in 2019 at a natural reef site (~37-m deep) in North Carolina, USA. There were 39 instances of tagged red snapper approaching bait during four baiting days, some of which approached due to apparent sensory cues (28%) while most approached incidentally (72%). Tagged red snapper approached bait from initial distances of 1 to 1 147 m (median = 27 m; mean = 86 m), and took 0 – 77 min (mean = 22 min) to approach. Fish were more likely to approach bait if they were located close to, and down-current of, the bait at deployment. Our estimated effective fishing area of 2 290 m2 (within which >50% of red snapper responded to bait) could be used along with video counts and other information to estimate densities of red snapper.

scholarly journals Biological Impact of Photoperiod on Fairy Shrimp (Branchinecta orientalis): Life History and Biochemical Composition

Biology ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 695
Author(s):  
Sara Farhadi ◽  
Behrooz Atashbar Kangarloei ◽  
Ahmad Imani ◽  
Kourosh Sarvi Moghanlou
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Protein Content ◽  
Biochemical Composition ◽  
Digestive Enzyme ◽  
Total Body Length ◽  
Constant Darkness ◽  
Fairy Shrimp ◽  
Daily Growth ◽  
Isoleucine Leucine

B. orientalis, fairy shrimp, is often among the most conspicuous invertebrates inhabiting temporary aquatic habitats with a typical variation in environmental conditions. Its life history characteristics and biochemical composition were studied under four different photoperiodic regimes (24L:0D, 0L:24D, 16L:8D, and 12L:12D). The significantly highest cumulative and initial hatching rates (48 h) were obtained at 24L:0D (p < 0.05). Cultivating the larvae under different photoperiods did not significantly affect specific growth rate (SGR) (p > 0.05). However, higher final total body length and daily growth rate were recorded under constant darkness. Higher lipid content was found at 24L:0D to the extent that it was more than two times higher than that at 16L:8D and 12L:12D (p < 0.05). There was also a remarkable increase in body crude protein content at 24L:0D (p < 0.05). Body fatty-acid profiles of the fairy shrimps were also affected by culture condition (p < 0.05). Extension of lighting period resulted in a subtle increase in body contents of arginine, lysine, histidine, isoleucine, leucine, valine, methionine, and phenylalanine, especially in the group kept under a 16L:8D regime. The highest and lowest digestive enzyme activity was observed at 0L:24D and 24L:0D, respectively (p < 0.05). In contrast, the highest and lowest soluble protein content was recorded at 24L:0D and 0L:24D, respectively (p < 0.05). Similarly, antioxidant status was significantly higher at 0L:24D (p < 0.05). In conclusion, a 16L:8D light–dark cycle might be an optimal condition in terms of growth performance and physio-biochemical characteristics. These findings could be helpful in optimizing the rearing conditions for upscaling B. orientalis production.

Life history parameters as possible discriminators of bluemouth Helicolenus dactylopterus (Delaroche, 1809) populations in Portuguese waters

2012 ◽  
Vol 125-126 ◽  
pp. 69-76 ◽  
Author(s):  
Vera Sequeira ◽  
Ana Neves ◽  
Rafaela Barros Paiva ◽  
João Pereira de Lima ◽  
Ana Rita Vieira ◽  
...  
Keyword(s):  
Life History ◽  
Life History Parameters ◽  
Helicolenus Dactylopterus

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
Sign in / Sign up

Export Citation Format

Share Document