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Brazilian Journal of Biology

versión impresa ISSN 1519-6984versión On-line ISSN 1678-4375

Braz. J. Biol., ahead of print  Epub 25-Nov-2019

https://doi.org/10.1590/1519-6984.204168 

Original Article

The influence of catch-and-release on mortality of Salminus brasiliensis (Cuvier, 1816)

A influência do pesque e solte na mortalidade de Salminus brasiliensis (Cuvier, 1816)

aPrograma de Pós-graduação em Recursos Pesqueiros e Engenharia de Pesca – PREP, Universidade Estadual do Oeste de Paraná – UNIOESTE, Campus de Toledo, Rua da Faculdade, 645, Jardim La Salle, CEP 85903-000, Toledo, PR, Brasil

bPrograma de Pós-graduação em Recursos Pesqueiros e Engenharia de Pesca – PREP, Grupo de Pesquisas em Recursos Pesqueiros e Limnologia – GERPEL, Instituto Neotropical de Pesquisas Ambientais – INEO, Rua da Faculdade, 645, Jardim La Salle, CEP 85903-000, Toledo, PR, Brasil


Abstract

Catch-and-release (CR) angling has been used to assist management programs seeking to promote the conservation and recovery of some recreational fish stocks by decreasing mortality from fishing. However, without appropriate fish handling, this activity may cause damage and injuries to individual fish, causing mortality. Therefore, CR should be allowed under some circumstances that ensure higher rates of survival to achieve the goals of the conservation measures. Thus, we experimentally tested the CR effects on dourado (Salminus brasiliensis) by comparing caught-and-released fish (CR fish) with uncaught fish (control fish) in a pond and estimating individual mortality rates related to seven air exposure times (AET: 120 s, 240 s, 360 s, 480 s, 600 s, 720 s and 840 s). We also determined a safe limit for fish handling and investigated the length and weight gain variations. We found that an increase in AET affects fish survival and that the limit of handling time for this species was 546 s; after this threshold, the individual probability of death exceeds 5%. The length and weight gain of CR fish did not differ significantly from the control fish. We believe that CR is efficient for S. brasiliensis because it does not significantly impair their organic growth and causes little or no mortality if handling is performed properly; thus, it could be employed to assist conservation programs.

Keywords:  recreational fishing; handling; air exposure; fish survival; conservation

Resumo

O pesque e solte (PS) tem sido utilizado para auxiliar programas de manejo que buscam promover a conservação e recuperação de estoques de peixes esportivos, através da redução da mortalidade pela pesca. Entretanto, sem a manipulação adequada dos peixes, essa atividade pode causar injúrias nos indivíduos, causando mortalidade. Dessa maneira, o PS deve ser permitido sob circunstâncias que possam garantir altas taxas de sobrevivência, de modo que as metas das medidas de conservação sejam atingidas. Assim, testamos experimentalmente os efeitos do PS sobre o dourado (Salminus brasiliensis), através da comparação de peixes capturados e liberados (peixes de PS) com peixes não capturados (peixes de controle) em um tanque de cultivo. Estimamos as taxas de mortalidades individuais relacionadas a sete tempos de exposição ao ar (TEA: 120 s, 240 s, 360 s, 480 s, 600 s, 720 s e 840 s). Determinamos um limite seguro para a manipulação do peixe e investigamos as variações no ganho de comprimento e peso. Foi encontrado que o aumento no TEA afetou a sobrevivência do peixe e que o limite de tempo para a manipulação da espécie foi de 546 s; depois desse limite, a probabilidade individual de morte excede 5%. O ganho de comprimento e peso dos peixes de PS não diferiu significativamente dos peixes de controle. Acreditamos que o PS é eficiente para o S. brasiliensis porque não afeta significativamente seu crescimento orgânico e causa pouca ou nenhuma mortalidade se a manipulação for realizada corretamente. Concluímos que a atividade pode ser empregada para auxiliar programas de conservação.

Palavras-chave:  pesca esportiva; manipulação; exposição ao ar; sobrevivência do peixe; conservação

1. Introduction

The need for fishery resources conservation is urgent, as fishing activities can lead to overfishing of freshwater fish stocks (Allan et al., 2005). Historically, the main actions related to fishing and fish stocks management in Brazilian reservoirs, such as fishery control, stocking programs and fish passage system construction in hydroelectric reservoirs, were mostly unsuccessful or caused negative impacts (Agostinho et al., 2008). Thus, the development of aquatic resources management techniques and the improvement of existing measures are fundamental for conserving fish stocks in continental aquatic ecosystems (Agostinho et al., 2005). In this context, recreational fishery management also deserves attention because inadequate management can further aggravate the situation of exploited fish populations (Albano and Vasconcelos, 2013).

Aiming to assist the recovery of depleted fish stocks in both freshwater and oceanic environments, catch-and-release (CR) angling has been used by the environmental agencies of many countries as a useful management tool for recreational fishery resources (Muoneke and Childress, 1994; Wilde, 1998; Lucy and Studholme, 2002; Bartholomew and Bohnsack, 2005; Cooke and Schramm, 2007; Cooke et al., 2013). However, the effectiveness of such management programs depends on the achievement of high survival rates and minimization of the negative consequences to fish health after their release (Cooke et al., 2002; Cooke and Suski, 2005). For this reason, specific research for each fish species, its geographic region, handling applied and equipment used are needed (Bartholomew and Bohnsack, 2005; Marques et al., 2007; Arlinghaus et al., 2010).

Recently, in Brazil, some state managers have implemented management programs that aim to recover fish populations, in which the only fishing activity allowed for designated species is CR. However, these conservation measures frequently are employed without an understanding of how angling actually influences the fate of the released fish (Arlinghaus et al., 2007; Cooke and Schramm, 2007). The impacts of CR on Brazilian game fish species are still not well understood and, in some cases, can lead to fish mortality, as well as to sublethal disturbances (Chaves and Freire, 2012; Petrere, 2014; Lennox et al., 2015), such as physiological disorders, behavioral alterations, and growth deficiencies (Cooke et al., 2002; Cooke and Suski, 2005).

As the stocks of dourado (Salminus brasiliensis) have shown a marked decline in some of their original hydrographic basins (Rosa and Lima, 2008) in the States of Paraná (Paraná, 2018) and Mato Grosso do Sul (Mato Grosso do Sul, 2019), commercial fishing was prohibited, and only CR was allowed for these stocks. In Argentina, Gagne et al. (2017) observed that air exposure for this species for long periods during CR can cause sublethal effects, such as stress and reflex impairments. To investigate the fate of the fish after release and with the assumption that CR angling is an applicable measure to assist in the conservation of S. brasiliensis, in this study, we experimentally evaluated the effects of CR on this species. To achieve this goal, we performed an experiment comparing caught and released fish (CR fish) with uncaught fish (control fish), estimated individual mortality related to seven air exposure times, determined a safe limit, and investigated the length and weight gain variations of the fish.

2. Material and Methods

2.1. Study site and fish origin

This study was approved by the Ethical Committee of Animals Use of the Western Paraná State University – UNIOESTE, under protocol number 37/13. To conduct this catch-and-release (CR) study, 500 juveniles (ca. 5 cm total length per fish) of S. brasiliensis were acquired from a fish farm in Toledo, State of Paraná, Brazil, and translocated to the Environmental Aquaculture Research Institute (InPAA - UNIOESTE), located in the same city. In the InPAA, these specimens were stored in a 1600 m2 pond, fed with a mix of commercial fish food (42% protein) and juvenile fish (part of the natural diet (Flora et al., 2010)) for ten months, until they reached approximately 25 cm of their standard length (SL). After this period, 287 individuals were available to be used in the CR experiment (Figure 1).

Figure 1 Study site and general experimental overview. Instituto de Pesca em Aquicultura Ambiental (InPAA) in Toledo, State of Paraná; 1600 m2 pond in which fish were raised for 10 months; fish identification by Passive Integrate Transponder (PIT), standard length and weight measuring; 800 m2 pond in which fish were kept for 30 days (four weeks) to climatization and posterior performance of experimental catch-and-release for 30 days (four weeks) and seven days (one week) for mortality observation after the catch-and-release period. 

2.2. Experimental design

To conduct the experiment, all available fish were: 1) caught from the pond with a fish net, anesthetized with benzocaine, the standard length was measured (SL) with an ictiometer and weighed (Wt) with a scale of one gram precision; 2) submitted to a surgical process to implant a passive integrated transponder (PIT) next to the dorsal fin; and 3) released and maintained in an 800 m2 pond for 30 days to observe possible mortality due to the surgical procedure, as recommended by Jensen et al. (2010) to avoid confusion with mortality due to proper CR activities (Figure 1). As recommended by Pollock and Pine (2007), all fish used during the experiment were kept in the same pond to simulate the CR process that occurs in the natural environment.

After 30 days of observation, the experimental CR was carried out for four weeks. For this effort, two days of fishing and five days without fishing were alternated to simulate the frequent behavior of sport fishers (fishing on the weekends). For the fishing days, the fishing took place for 3 h in the morning and 3 h in the afternoon. For each individual fish caught, the following protocol was adopted: obtaining the time between hooking and apparent exhaustion of the fish (playing time – PT); fish were landed with a lip gripper device; identification by PIT; measurement of SL; weighing of Wt.; atmospheric air exposure for a predetermined time (AET); and maintenance in the pond water during a minute for recovery followed by release back into the pond.

CR was performed following the recommendations of Ceccarelli et al. (2006). Tackle used to fish were rods with baitcasting or spinning reels for light and ultralight fishing, employing live bait and artificial lures. For live bait fishing, a “J” style hook with a total length of 2.5 cm and a needle point with a barb, connected to a stainless-steel leader of 2 cm was used. The artificial lures used were spinners and small plugs equipped with barbed treble hooks.

The experiment had seven treatments of AET: 120 s, 240 s, 360 s, 480 s, 600 s, 720 s and 840 s. These times were determined after personal communications with sport fishers in the region. The individual fish for each treatment were selected from a systematic sampling in which the first fish caught was submitted to the first AET and following fish to successively longer times. The control group (C) consisted of fish kept in the same pond, but they were not caught during the catch-and-release period (sensuPollock and Pine, 2007).

To observe long-term (> 72 h) mortality due to sublethal effects (Pollock and Pine, 2007), the experiment ended seven days after the CR period, when all fish were removed for biometry (SL and Wt.) and survival confirmation. During the entire experimental period, the pond was inspected daily for mortality observations. We also measured physical and chemical water variables daily, which remained in the acceptable ranges (temperature: 24.1 and 30.2 °C; dissolved oxygen: 9.8 and 13.85 Mg/L; and pH: 8.71 and 9.17) for the survival and growth of tropical teleost freshwater fish (Baldisserotto, 2002).

2.3. Data analysis

Initially, we verified that the initial fish characteristics (SL and Wt.) and playing time (PT) were similar among the treatments of AET with a permutational multivariate analysis of variance (PERMANOVA; Anderson, 2001) of the standardized data (F(6, 63) = 0.27, p = 0.99), which allowed us to perform the following analyses without considering these variables. In sequence, the length and weight gain were analyzed by the differences between initial and final biometric data, according to Equation 1:

DSL=SLfSLi and DWt=WtfWti (1)

in which SL and Wt. were the standard length and the weight on the last (f) and first (i) days of the experiment, respectively.

The assessment of the effects of AET on DSL and DWt was performed by one-way analysis of variance (ANOVA) of the raw data (normality and homoscedasticity were determined with the Shapiro-Wilk and Bartlett tests, respectively, both under 5% probability). As the C group contained more individuals than each AET treatment, we randomly selected individuals in the control group to balance the group sizes, allowing the application of ANOVA. For case of significant differences (p < 0.05) we used the post hoc Dunnett’s test to contrast treatments with control group.

Mortality due to CR was measured by the model proposed by Pollock and Pine (2007), which considers the control group survival. In this model, the instantaneous mortality rate caused by hooks (MHO) is estimated by Equation 2:

MHO=lnSHTSCT (2)

in which SHT is the survival of CR fish and SCT is the survival of control fish. As MHO represents the proportion ranging from zero, when all fish in the treatments survive, to one, when all die, we fit a logistic regression to the obtained instantaneous mortality rate over the AET.

We used the nonlinear Gauss-Newton estimation method and minimized the residual sum of squares (Davidon, 1991). We chose the logistic regression method because it gives a continuous equation for the individual probability for the occurrence of a determined event along a continuous variable (Neter et al., 1996); for this case, more fish die with increasing AET values. This procedure allowed us to estimate the specific value of AET that represents an individual risk of death equal to 5%, the commonly used value in statistical significance tests.

PERMANOVA and ANOVA were performed with software R (R Development Core Team, 2017) and the logistic regression analysis was performed with Statistica 7.1 software (StatSoft, 2005) at the 5% significance level.

3. Results

Following the experimental protocol, 70 individuals were caught and released (CR fish), with equally distributed values of AET. The treatments of AET did not affect the length and weight gain of fish (one-way ANOVA with treatments and control groups for DLS: F(7,65) = 0.85, p = 0.55; and for DWt: F(7,65) = 0.57, p = 0.78, respectively), so we did not apply the Dunnett’s test. Although without distinct effects for AET and control, all groups showed a decrease in weight and an increase in length (Figure 2).

Figure 2 Box plot related to: (a) difference in standard length (DSL); (b) difference in weight gain (DWt) for air exposure times (AET). 

Of the 70 CR fish, five died (7.14%), and of the 217 specimens in the control, only one died (0.46%). The deaths in the AET treatments occurred from 600 s and longer, and all were observed within a short time (72 h after CR). The AET significantly affected the instantaneous mortality rate, MHO, with increasing chance of death as the fish were exposed for longer periods to the air (logistic regression: final loss (Max likelihood) = 14.92, χ12 = 6.186, p = 0.013). By the logistic model, it was estimated that 546 s the maximum AET allowed because above this period of time, the individual risk of fish death is higher than 5% (Figure 3).

Figure 3 Instantaneous rates of catch-and-release mortality (MHO), adjusted logistic model equation, regression curve and critical limit of AET for S. brasiliensis

4. Discussion

We carried out long-term observations and all deaths of S. brasiliensis in the AET treatments (7.14%) occurred prior to 72 h after release and with more than 600 s of AET. The mortality rate of S. brasiliensis increased significantly with AET, as expected, and had already been reported for bluegill (Lepomis macrochirus) by Gingerich et al. (2007). These authors identified higher mortality rates in water at 27.4 °C and AET at 480 and 960 s, close to the values observed for S. brasiliensis. In the present study, there was no mortality for AET shorter than 480 s, and similar results were found for trout Salvelinus fontinalis (Schreer et al., 2005) and pikeperch Sander lucioperca (Arlinghaus and Hallermann, 2007). These studies did not find relevant mortality rates for AET less than 240 s. However, both in Gingerich et al. (2007) and in our study, fish survival was affected when the fish were submitted to longer AET. Furthermore, Gagne et al. (2017), despite observed low mortality in S. brasiliensis due to CR, found that increases in AET induced stress and impaired reflexes of these fish, consistent with the idea that prolonged AET can influence fish welfare and health, leading to long recovery times and to mortality.

Other studies related to CR mortality performed in Brazil frequently show low percentages of immediate (soon after release) and short-term mortality (<72 h), supporting our results. Examining immediate mortality, Sepulchro et al. (2013) found 100% survival of red piranha (Pygocentrus nattereri) for AET shorter than 180 s. When related to short-term mortality, peacock bass (Cichla temensis) kept in a cage for 72 h after CR reported values of 3.5% and 0.55% (Thomé-Souza et al., 2014; Barroco et al., 2018, respectively), 2.3% for C. orinocensis and 5.2% for C. monoculus (Thomé-Souza et al., 2014). However, as these studies were carried out for short-term mortality evaluation, they were not able to quantify the effects of CR on weight and length gain.

The fact that the length and weight gain of the individuals submitted to the AET treatments had not been relative to the control suggests that CR did not exert a large influence on these gains during the experiment. These results support those found by Pope et al. (2007), in which differences in length and weight gain were not noticed between CR fish and control fish during a month of fishing and recovery. Arlinghaus and Hallermann (2007) also observed that growth was not significantly different among AET durations. However, Cooke et al. (2013), in a review study, reported that several CR studies had found some degree of sublethal disturbance due to catch and later release.

The determination of an AET limit, also termed as the critical AET, is fundamental for making the CR procedure more efficient for conservation purposes. Hooked fish undergo exhausting exercise during playing time, followed by air exposure time when the fish are handled before release. This procedure, if prolonged, may result in substantial physiological disturbances and tends to cause adverse impacts and generate longer recovery periods (Arlinghaus and Hallermann, 2007). Therefore, we can conclude that CR for S. brasiliensis should be practiced with AET less than 546 s to promote sustainable exploitation by recreational fishing. However, the handling time of fish out of water should be reduced as much as possible to ensure fish welfare from an ethical point of view. We believe that CR is applicable for this species because it does not significantly impair its organic growth and causes little or no mortality if handling is properly performed. Furthermore, future studies should focus on the relationship between CR for different aspects of fish biology, such as reproductive success.

Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. We would like to thank CAPES for the scholarship they provided the first author during the master’s program.

(With 3 figures)

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Received: June 18, 2018; Accepted: August 08, 2019

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