The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions

2011 ◽  
Keyword(s):  
Fish Species ◽  
Meta Analysis ◽  
Contemporary Literature ◽  
High Water ◽  
Recreational Fisheries ◽  
Catch And Release ◽  
Capture Event ◽  
Recreational Angling ◽  
Species Specific ◽  
Mortality Estimates

<i>Abstract</i> .—In recreational fisheries, catch and release is widespread and practiced under the assumption that released fish survive the capture event unharmed. To improve understanding about the lethal impacts of catch-and-release recreational angling, a quantitative meta-analysis of the literature on hooking mortality and its determinants was conducted focusing on freshwater fishes. Studies were initially selected based on the occurrence of the study species in European recreational fisheries. Because original studies from European freshwater or diadromous fish species were rare, studies from the same genus as native European species were also included in the meta-analysis. Mean hooking mortality ± SE across all species was 15.9 ± 1.3% (<i>n </i> = 252 hooking mortality estimates in <i>n </i> = 107 studies), with a median of 7.8% and a range from 0% to 88.5%. The distribution of hooking mortality estimates was highly skewed towards low values; about 60% of all hooking mortality values were below 10%. Average hooking mortality varied between fish families and was highest for Percidae (mean ± SE, 19.9 ± 5.3%) followed by Salmonidae (15.9 ± 1.4%), Esocidae (14.9 ± 7.0%), and Cyprinidae (5.7 ± 1.6%). Hooking mortality was positively related to water temperature and was significantly higher for natural baits and barbed hooks than for artificial baits and barbless hooks. Size of fish and type of hook were unrelated to the level of hooking mortality. To minimize hooking mortality on European fish species, we recommend the use of barbless hooks and artificial baits and we suggest avoiding catch and release of fish during high water temperatures. Further research on the impacts of catch and release on a number of European fishes is recommended because of the limited coverage of species-specific information in the contemporary literature.

scholarly journals Hormonal Regulation of Fish Adaptation to Atypical Fluctuations in Temperature and Oxygen Regime of a Water Body

2019 ◽  
Vol 7 (2) ◽  
pp. 1
Author(s):  
Oleksandr Potrokhov ◽  
Oleg Zinkovskyi ◽  
Mykola Prychepa ◽  
Yurii Khudiiash
Keyword(s):  
Water Temperature ◽  
Oxygen Concentration ◽  
Fish Species ◽  
Hormonal Regulation ◽  
High Water ◽  
Fish Growth ◽  
Increase Water Temperature ◽  
Growth And Change ◽  
Species Specific ◽  
Increased Activity

Recently, the water temperature significantly exceeded the climatic norms for the studied region of Ukraine. Water is heated to 30ºC with a decrease in the concentration of dissolved oxygen in shallow water. In this connection, the change in the hormone content in the blood plasma of carp, roach, rudd, perch and ruff in response to these factors has been studied. Most of the fish species studied in June respond by increasing the cortisol content in the blood by 1.2–3.3 times to an increase in water temperature. Fish quite successfully adapts after a month's stay in conditions of high water temperature to 31ºC, and the level of cortisol is reduced. The content of thyroid hormones in the blood of the rudd, roach and ruff is quite high and after a month of adaptation to the existing factors. This indicates an increased activity in their metabolic processes. The content of somatotropin and prolactin in the blood of the studied fish species decreases 2.4–5.0 and 1.9–7.7 times, respectively, in response to an increase in temperature and a decrease in the oxygen concentration in water. This should lead to a decrease in the rate of fish growth and change in the activity of osmotic exchange. However, hormonal reactions are species-specific in nature to the existing factors. Perch and roach are less plastic to increase water temperature. Carp most favorably tolerates an increase in water temperature and a decrease in oxygen concentration.

Biology and Management of Inland Striped Bass and Hybrid Striped Bass

2013 ◽  
Keyword(s):  
Striped Bass ◽  
Fishery Management ◽  
Meta Analysis ◽  
Handling Time ◽  
Anatomical Site ◽  
Hybrid Striped Bass ◽  
White Bass ◽  
Catch And Release ◽  
By Catch ◽  
Mortality Estimates

<em>Abstract</em>.— We conducted a meta-analysis of existing studies of striped bass <em>Morone saxatilis</em> and hybrid striped bass (striped bass × white bass <em>M. chrysops</em>)catch-and-release mortality in freshwaters. Water temperature or season (<EM>P</EM> < 0.0001) and anatomical site of hooking (<EM>P</EM> < 0.0001) were the most consistently significant predictors of striped bass catch-and-release mortality. Bait type (<EM>P</EM> = 0.0007), presence of bleeding in hooked fish (<EM>P</EM> = 0.0017), and handling time (<EM>P</EM> = 0.0363) also affected catch-and-release mortality. Only two studies examined catch-and-release mortality of hybrid striped bass. We conducted surveys of fishery management agencies and striped bass fishing clubs to assess their opinions about the importance of catch-and-release mortality in striped bass and hybrid striped bass fisheries. Compared with fishery management agencies, a greater proportion of fishing clubs believed that catch-and-release mortality impacted striped bass fisheries. In general, fishery management agencies believed that striped bass catch-and-release mortality was low, although most had little information, and viewed catch-and-release mortality as a social, rather than biological, issue. To assess the potential impacts of catch-and-release mortality on striped bass fisheries, we constructed a simple model that, based on average summer release rates and water temperatures, estimated the proportion of striped bass total summer catch lost to catch-and-release mortality. Estimates ranged from 16% to 60% (mean = 36%) if all fish were captured on natural baits and 11% to 31% (mean = 19%) if all fish were captured on artificial baits. Although most fishery management agencies view catch-and-release mortality of striped bass and hybrid striped bass as mostly a social issue, it appears that they currently underestimate the magnitude of the biological problems presented by catch-andrelease fishing for striped bass and hybrid striped bass.

scholarly journals Mortality of Atlantic salmon after catch and release angling: assessment of a recreational Atlantic salmon fishery in a changing climate

2020 ◽  
Vol 77 (9) ◽  
pp. 1518-1528
Author(s):  
Travis E. Van Leeuwen ◽  
J. Brian Dempson ◽  
Chantelle M. Burke ◽  
Nicholas I. Kelly ◽  
Martha J. Robertson ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Climate Warming ◽  
Human Activities ◽  
Population Level ◽  
High Water ◽  
Published Data ◽  
Recreational Fisheries ◽  
Catch And Release ◽  
Salmon Fishery

Human activities have the potential to accelerate population-level decline by contributing to climate warming and decreasing the capacity of species to survive warming temperatures. Here we build a predictive model to test interactions between river warming and catch and release mortality in recreational fisheries for Atlantic salmon (Salmo salar) by compiling and analyzing published data. We then test whether warming has occurred in rivers where angling occurs and whether angling opportunities have been restricted through increased river closures due to high water temperatures. We find that catch and release mortalities are low (<0.05) at cool river temperatures (<12 °C). At river temperatures often leading to fishery closures (between 18 and 20 °C), mortalities range from 0.07 to 0.33 (mean = 0.16). River temperatures on the east and southeast coasts of Newfoundland have warmed, leading to an increase in fishery closures in recent years. By contrast, river temperatures in southern Labrador have warmed slightly, with only one documented river closure. Accordingly, increasing temperatures will increase the frequency of river closures and likely result in higher mortality in caught and released Atlantic salmon in rivers that remain open to catch and release angling at warm water temperatures.

​Discrimination of Five Gobid Species (Family: Gobiidae) based on Otolith Morphometry

2021 ◽  
Author(s):  
Vikas Pathak ◽  
Rinchen N. Bhutia ◽  
Shashi Bhushan ◽  
Geetanjali Deshmukhe ◽  
A.K. Jaiswar
Keyword(s):  
Fish Species ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Allometric Growth ◽  
Fish Size ◽  
Sagittal Otolith ◽  
Shape Indices ◽  
Glossogobius Giuris ◽  
Species Specific ◽  
Boleophthalmus Dussumieri

Background: The fishes of family Gobiidae are one of the least studied fishes, especially for otolith structure. The otoliths were possess species specific features. Hence, traits of sagittal otolith of gobid species studied. Methods: Five gobid species Odontamblyopus roseus (Valenciennes, 1837), Trypauchen vagina (Bloch and Schneider, 1801), Glossogobius giuris (Hamilton, 1822), Parachaeturichthys polynema (Bleeker, 1853) and Boleophthalmus dussumieri (Valenciennes, 1837) were investigated by three methods including morphological, shape indices and step wise discriminant function analysis (SDFA). Result: Interrelationship between shape indices investigated, at 95% level of confidence (P less than 0.05), revealed that perimeter of P. polynema and area of T. vagina have isometric growth with their length (b = 3.0071, 2.90, respectively) and otolith area of B. dussumieri have positive allometric growth (b = 4.23077). SDFA, based on otolith morphometry, discriminated species up with 97.18% accuracy. Hence, the results of present investigation can be used for discrimination of the species and as a tool in predicting fish size from the otoliths and in calculating the biomass of these less studied fish species.

Sub-lethal responses of mahseer (Tor khudree) to catch-and-release recreational angling

2019 ◽  
Vol 211 ◽  
pp. 231-237 ◽  
Author(s):  
Shannon D. Bower ◽  
Neethi Mahesh ◽  
Rajeev Raghavan ◽  
Andy J. Danylchuk ◽  
Steven J. Cooke
Keyword(s):  
Catch And Release ◽  
Recreational Angling

scholarly journals Individual Serum Triiodothyronine and Thyroxine Levels in Seven Freshwater Fish Species

2021 ◽  
Vol 23 (1) ◽  
pp. 59-66
Author(s):  
Alexander Atanasoff ◽  
Dimitrinka Zapryanova ◽  
Cigdem Urku ◽  
Galin Nikolov
Keyword(s):  
Serum Concentration ◽  
Thyroid Hormones ◽  
Fresh Water ◽  
Fish Species ◽  
Reference Intervals ◽  
Specific Reference ◽  
Fresh Water Fish ◽  
Water Fish ◽  
Total Thyroxine ◽  
Species Specific

Abstract The thyroid hormones (THs) play an important role in the regulation of the rate of metabolism, affect the growth and function of different systems in the organism. The aim of this study was to assess serum concentration of total triiodothyronine (T3), total thyroxine (T4) as well as T3/T4 ratio in serum from healthy fresh water fish from Salmonidae, Acipenseridae, Cyprinidae, and Clariidae families to determine species-specific reference intervals. Mean concentrations of T3 and T4 levels varied significantly among fish. Finally, the test results show clear differences in the serum concentration of the T3 and T4 and give new insight into the thyroid hormones reference values in some commercial fresh water fish species.

scholarly journals A review of length-weight relationships of freshwater fishes in Malaysia

2018 ◽  
Vol 20 (1) ◽  
pp. 55-68 ◽  
Author(s):  
Amonodin Mohamad Radhi ◽  
Mohd-Fadzil Nurul Fazlinda ◽  
Mohammad Noor Azmai Amal ◽  
Hashim Rohasliney
Keyword(s):  
Freshwater Fish ◽  
Fish Species ◽  
Environmental Changes ◽  
Meta Analysis ◽  
Freshwater Fishes ◽  
Clarias Batrachus ◽  
Ecological Health ◽  
Allometric Growth ◽  
Freshwater Fish Species

Abstract This manuscript reviews the length-weight relationships (LWRs) of freshwater fishes in Malaysia. A total of 102 LWRs of fishes gathered from literature pertaining to 64 freshwater fish species were analysed. A meta-analysis from 13 previous reports showed that the b values was ranged from 2.19 (Clarias batrachus) to 4.106 (Barbodes binotatus). Out of 64 observed species, 47 species (11 families) experienced positive allometric growth, while another 23 species (eight families) and 31 species (12 families) were recorded under isometric and negative allometric growth, respectively. The fish LWRs observed can be used as an indicator of environmental changes and fish ecological health for freshwater fishes in Malaysia.

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