Assessment of caudal fin clip as a non-lethal technique for predicting muscle tissue mercury concentrations in largemouth bass

2008 ◽  
Vol 5 (3) ◽  
pp. 200 ◽  
Author(s):  
S. A. Ryba ◽  
J. L. Lake ◽  
J. R. Serbst ◽  
A. D. Libby ◽  
S. Ayvazian
Keyword(s):  
Rhode Island ◽  
Muscle Tissue ◽  
Largemouth Bass ◽  
Total Mercury ◽  
Micropterus Salmoides ◽  
Mercury Contamination ◽  
Caudal Fin ◽  
Minimal Impact ◽  
Fish Consumption Advisories ◽  
Relationship Of

Environmental context. In the development of fish consumption advisories, fisheries biologists routinely sacrifice fish and analyse muscle fillets in order to determine the extent of mercury contamination. Such lethal techniques may not be suitable for endangered species or limited fish populations from smaller-sized water bodies. We compared the measured total mercury concentrations in tail fin clips to that of muscle fillets and illustrated that tail fin clips may be used as an accurate tool for predicting mercury in muscle tissue. This is the first study on the use of tail fin clips to predict mercury levels in the muscle tissue of largemouth bass with minimal impact on the fish. Abstract. The statistical relationship between total mercury (Hg) concentration in clips from the caudal fin and muscle tissue of largemouth bass (Micropterus salmoides) from 26 freshwater sites in Rhode Island, USA was developed and evaluated to determine the utility of fin clip analysis as a non-lethal and convenient method for predicting mercury concentrations in tissues. The relationship of total Hg concentrations in fin clips and muscle tissue showed an r2 of 0.85 and may be compared with an r2 of 0.89 for Hg concentrations between scales and muscle tissue that was determined in a previous study on largemouth bass. The Hg concentration in fin clip samples (mean = 0.261 μg g–1 (dry)) was more than a factor of twenty greater than in the scale samples (mean = 0.012 μg g–1 (dry)). Therefore, fin clips may be a more responsive non-lethal predictor of muscle-Hg concentrations than scale in fish species which may have reduced Hg concentrations.

scholarly journals Mercury and Methylmercury Concentrations in Muscle Tissue of Fish Caught in Major Rivers of the Czech Republic

2008 ◽  
Vol 77 (4) ◽  
pp. 637-643 ◽  
Author(s):  
K. Kružíková ◽  
T. Randák ◽  
R. Kenšová ◽  
H. Kroupová ◽  
D. Leontovyčová ◽  
...  
Keyword(s):  
Czech Republic ◽  
Muscle Tissue ◽  
Total Mercury ◽  
Atomic Absorption Spectrophotometry ◽  
River Pollution ◽  
Mercury Contamination ◽  
Electron Capture Detection ◽  
Fresh Weight ◽  
The Czech Republic ◽  
A Site

The aim of the study was to evaluate mercury contamination at twelve outlet sites of rivers in the Czech Republic (Labe, Ohře, Vltava, Berounka, Sázava, Otava, Lužnice, Svratka, Dyje, Morava and Odra). As an indicator, we used muscle tissue of the chub (Leuciscus cephalus) caught at selected sites in 2007. A total of 96 fish were examined. Total mercury was determined by atomic absorption spectrophotometry using the AMA 254 analyzer and methylmercury was determined by gas chromatography with electron-capture detection. Total mercury (THg) and methylmercury (MeHg) concentrations ranged 0.039–0.384 mg kg-1 fresh weight and 0.033–0.362 mg kg-1 fresh weight, respectively. Mercury bound in methylmercury (HgMe) made up on average about 82.2% of total mercury. The highest mercury concentrations were found in fish from Obříství, a site on Labe (THg 0.263 ± 0.086 mg kg-1; MeHg 0.256 ± 0.084 mg kg-1). Mercury concentrations in fish from rivers that cross the borders of the Czech Republic (Labe, Odra and Morava) were low. The Czech Republic therefore does not contribute significantly to river pollution outside its national borders. Hazard indices of the sites monitored were well below 1, and reached 1.365 only in Obříství on Labe for fisherman’s family members (i.e. in the case of annual consumption of 10 kg fish). This indicates possible hazards involved in eating meat of fish caught in that location. Based on PTWI for methylmercury, the maximum amount of fish meat allowed for consumption per week was calculated. The site with the lowest value was Obříství on Labe (0.44 kg). The results of this study present a partial contribution to health risk assessment on the major rivers in Czech Republic.

Speed effects on midline kinematics during steady undulatory swimming of largemouth bass, Micropterus salmoides

1995 ◽  
Vol 198 (2) ◽  
pp. 585-602 ◽  
Author(s):  
B. C. Jayne ◽  
G. V. Lauder
Keyword(s):  
Swimming Speed ◽  
Largemouth Bass ◽  
High Speed ◽  
Lateral Displacement ◽  
Micropterus Salmoides ◽  
Beat Frequency ◽  
Morphological Data ◽  
Caudal Fin ◽  
Mean Values ◽  
The Times

We used frame-by-frame analysis of high-speed videotapes to quantify midline kinematics during steady swimming in largemouth bass at five standardized speeds (0.7, 1.2, 1.6, 2.0 and 2.4 L s-1, where L is total length). By combining morphological data from X-ray photographs with mathematical reconstructions of the midline of each fish, we determined the amplitude and timing of lateral displacement (zmax), lateral flexion (ssmax) and the angle between the midline and the axis of forward travel (thetamax) for each vertebral joint, the hypural bones and four equally spaced segments of the caudal fin rays. Analysis of variance revealed pervasive significant effects of both swimming speed and longitudinal location on variables describing amplitude, phase and wavelength. The amplitudes of zmax, ssmax and thetamax generally increased in a non-linear fashion from approximately 25 %L to the tip of the caudal fin, and the greatest speed-related increases occurred between 0.7 and 1.6 L s-1. For the snout, the first caudal vertebra and the trailing edge of the caudal fin, mean values of zmax increased with speed from 0.004 to 0.012 L, from 0.005 to 0.012 L and from 0.053 to 0.066 L, respectively. For joints between the skull and the first vertebra, between the trunk and the tail vertebrae, and among the most posterior caudal vertebrae, mean values of ssmax increased with speed from 1.2 to 1.7 degrees, from 0.6 to 0.9 degrees and from 1.4 to 2.2 degrees, respectively. Within each swimming speed, values of ssmax of the distal caudal fin commonly exceeded twice those of the proximal caudal fin. Surprisingly, at a given longitudinal location, the times of maximum lateral displacement and bending did not occur simultaneously. Instead, the phase of zmax relative to ssmax was commonly shifted by more than one-sixth of a cycle. Furthermore, the phase shift between zmax and ssmax changed significantly with increased swimming speed. Angles of attack of the tail structures changed periodically from negative to positive values. Maximum angles of attack of the distal caudal fin ranged from 5 to 17 degrees, changed significantly with swimming speed and were less than those of the hypural bones of the tail. Mean tail-beat frequency increased significantly from 2.0 to 4.2 Hz with increased swimming speed. Estimated speeds of wave propagation showed considerable longitudinal variation, and the ratio of swimming speed to posterior wave speed increased from 0.59 to 0.83 with increased swimming speed.

Pathogeny of disease characterized by swollen liver and spleen in largemouth bass (Micropterus salmoides)

2013 ◽  
Vol 18 (3) ◽  
pp. 654-659 ◽  
Author(s):  
Dongmei MA ◽  
Guocheng DEND ◽  
Junjie BAI ◽  
Shengjie LI ◽  
Xiaoyan JIANG ◽  
...  
Keyword(s):  
Largemouth Bass ◽  
Micropterus Salmoides
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