RESEARCH JOURNAL OF FISHERIES AND HYDROBIOLOGY

2016. 11(9): 1-6 ISSN: 1816-9112 Journal home page: http://www.aensiweb.com/JASA/

Growth Parameters of Pseudophoxinus anatolicus (Hanko 1924): an endemic and endangered species of Beyşehir Lake (Turkey)

Sevil Demirci

İskenderun Technical University,Department of Marine Technologies, Marine Sciences and Technology Faculty, 31200, İskenderun/Hatay- TURKEY

Address For Correspondence: Sevil Demirci, İskenderun Technical University,Department of Marine Technologies, Marine Sciences and Technology Faculty, 31200, İskenderun/Hatay- TURKEY E-mail: [email protected]; Tel: +90 326 614 16 93; Fax: +90 326 614 18 77

Received ; Accepted 2016; Available 2016

A B S T R A C T Background: Determination of growth parameters is a basic topic for sustainable ecosystem and fishery . In that respect, growth parameters ofPseudophoxinusanatolicusis very important. Because,P. anatolicusis national threatened fish category and endemic species for Beysehir lake. Objective:The main objective of this study was to determine anatolicus (Hanko, 1924) of age related growth relation by means of regression and von Bertalanffy Growth models. In addition, the length-weight relationships and growth performance index is important for evaluation of population data were obtained. The species should also be included into national threatened fish category. Methods: A total amount of 52 fish were caught by using multifilament trammel nets, were mesh size 100 mm, 110 mm, 120 mm. Sex determination of the species was analysed. Fork length (FL) and Total weights (W) were measured. The scales were used for age determination. Results: Growth parameters andgrowth performance index ofP. anatolicusand the mean condition factor of this species were estimated. The P. anatolicus length-weight relationship were calculated. According to these data, The P.anatolicus population may be affected by the conditions negative processes because of this species has fragile population structure.Conclusions: Important data was offered by this study in terms of fishery and resource managers. Particularly this population was consisted of individuals in younger age groups. This topic should be considered in terms of sustainable of the species.

Key words: Pseudophoxinus anatolicus, Threatened Fish,Beyşehir Lake, von Bertalanffy Equation, Growth Parameters, Sustainable Fishery

INTRODUCTION

Pseudophoxinus belonging to the family are represented around 29 species [35]. This genus has a distribution areas such as Balkans, Anatolia, the Middle East, the Caspian Sea Basin and North Africa [14]. This genus Pseudophoxinus anatolicus which is a kind pelagic speciescommonly inhabiting in springs, slow- flowing waters and lakes [26,23]. P. anatolicus is known as fatty fish, by the public. This species are distributed Palearctic Anatolia region. It has an endemic features in Lakes Akgöl, Beyşehir, Çavuşçu, Saz, Akkaya dam and Ereğli marshes,Kızılca, Goyöz and İnsuyu villages in Central Anatolia area [7,19]. Although there are a few species in mentioned regions, this population extinct in Lake Beyşehir [31,20]. Because,

Open Access Journal Published BY AENSI Publication © 2016 AENSI Publisher All rights reserved This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

To Cite This Article: Sevil Demirci., Growth Parameters of Pseudophoxinus anatolicus (Hanko 1924): an endemic and endangered fish species of Beyşehir Lake (Turkey). Research Journal Of Fisheries And Hydrobiology, 11(9): 1-6, 2016

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Lake Beyşehir have been exposed to industrial, domestic and agricultural pollutants.Although Lake Beyşehir was stated as National Park in 1993, conversation efforts are insufficient [5]. P. anatolicus is considered as national threatened fish category. Today population of P. anatolicusespecially, local endemic species has reached a critical level due to the destruction of the natural environment for many reasons [30]. Physical reasons are stated as water extraction for irrigation purposes and occurrence of aridness. Biological reasons are indicated as overfishing [11,31,25]. This risk groups are shown also in Beyşehir Lake.Sensitive aquatic life of freshwater regime was affected environmental deterioration. There are studies on distribution and moleculer systematic, fatty acid profiles of P. anatolicus [13,10,18,33]. Nothing else, length-weight, length-length relationships are indicated for this endangered species by Yoğurtçuoğlu et al. [35]. However, there are no information and study about growth parameters of this species. In this respect, this study can be evaluated as a first data.For the purpose of this study was to determine this endangered species age composition and to analyse the length, age and growth through regression and von Bertalanffy Growth models. Because, these parameters can play important role about sustainable fishery, population dynamics and ecosystem models.

MATERIALS AND METHODS

The Lake Beyşehiris situated in between Isparta and Konya provinces, southwestern part of Turkey(37°45′ N-31°36′ E)It has an area of 650.00 km² and is 45 km long and 20 km wide [12]. The lake has a surface area of 690 km2 and average depth of 6m. Its altitude is 1150 m [4]. The water level in the lake often fluctuates by year and by season [12,8]. Beyşehir Lakewhich has 24 different sizes islands is supplied by streams (Hanboğazı, Söğütlü, Çarıksaray creek, Eflatun spring, Ozan and Termiye watercourse) [1,34]. Beyşehir Lakewhich has an important ecological structure was declared as a National Park by TheDirectorate of Nature Conservation and National Parks, The Ministry of Environment and Forestry of Turkey [34]. A total amount of 52fish were taken from the local fisherman by using multifilament trammel nets, were mesh size 100 mm, 110 mm, 120 mm and were hanged ratio with 0.50, in between January 2008 and February 2009. These samples was obtained tributaries of the Beysehir Lake. There was no species in the main basin of the lake. Fork length (FL) were measured with the nearest 0.1 cm using a measuring board. Total weights (W) were determined to the nearest 0.001 g using a electronic balance. Sex determination of the species was achieved by examining both the pelvic fin and anal fin distance for males and gonads were analysed [21]. The samples which were analyzed ageing were fixed in 4% buffered formalin immediately after removing scales. The scales in between anterior part of dorsal fin and upper part of the lateral line were used for age determination [2]. After making the scale preparation, ages were read under stereo microscope (20x and 40x) by the two authors. Bagliniere and Louarn [3] and Steinmetz and Müller [32] were taken into account as the criteria for confirming the presence of annulus. Examples of this can be achieved with a limited number of P. anatolicus has attempted to predict some biological parameters are considered to be important. Using total length and weight values length-weight relationship was estimated [16]. Length and weight relationships of the sepecieswere calculated with W = aLb, where W is the fish weight (g) and L is the total length (cm).Fish scales reading were used for von Bertalanffy growth equation.In this study, growth parameters that could fit the data was used the Von Bertalanffy growth equation [6]. -k(t-t0) Lt=L∞(1-e ) Lt is the total length at age t, L∞, is the maximum theoretical total length, k is the growth coefficient, t0 is the theoretical age at zero length. In logistic equation t* age of the growth inflexion [29] Pauly et al. [27] applied parameters of von Bertalanfy equation, K and L∞ forgrowth performans index (ɸ) in fish. ɸ=Log K+2Log L∞

RESULTS

The age group and sex distribution of all specimens examined are shown in Table 1. Total, 52.38 % were female and 47.62% were male. Ages ranged between I to IV and the most common group was II (39.05%). Age groups I, II andIII were composed of 82.39% of all specimens studied (Table 1). The sex ratio acquired for each group is given in Table 1. Greater sex ratios at males were appeared only in the age group II (0.8female: 1 male). The observed sex ratio was 1.2 females for 1 male. Length distribution was found to be changing from 12.5 to 23.4 cm in females and this range forweight varied from 13.1 cm to 19.3 cm in males. Total length distribution of P. anatolicusis given in Table 1. Weight composition was varied from 40.6 to 179.5 g in females and this range for weight was changing from 37.4 to 127.8 g in males.

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The P. anatolicus length-weight relationship from the Beyşehir Lake were calculated on the basis of the data on length and weight obtained by measurements of all individuals sampled. The regression constants a and b were estimated as 0.05 and 2.68 respectively. The length weight relationship were estimated as W= 0.05 L2.68 (Fig 2). The mean condition factor of this species were as 1.84. The von Bertalanffy growth equation and the growth performance index of this species were Lt= 23.93-exp 0.63(t-(-0.29)) (Fig 3) and ɸ= 2.55 respectively.

DISCUSSION

In Beyşehir Lake, the composition of age groups for P. anatolicus population indicates a distribution between I to IV of the specimens examined, it was determined that age group II was the largest. The domination of age group II for both females and males may be according to local fishing sampling. Linfield [24] have stated that if a habitat has aged individuals there is a light fishing in this area, in contrast if the population is younger in any habitat, there is a heavy fishing namely, the latter is under catching pressure [9]. This impression fits the age distribution of the P.anatolicuspopulation in Beyşehir. P. anatolicus, could continue life cycleif there is no sufficient and heavy fisheries activity in a lake. Minimum total length observed in this study (12.5 cm) was smaller than those (15,0 cm) reported by Yoğurtçuoğlu et al. [35].While maximum total length identified in this research 23,4 cm, other studies was determined 23,2 cm.This study was represented wider range of groups. According to the reported Yoğurtçuoğlu et al. [35], weıght distribution were ranged from 36.4 to 154.9 g. In this study weıght distribution of the P. anatolicus were ranged from 37.4 to 179.5 g. Length weight relationship was different for both studies. It is thought to result relatively low number of the samples for both research ( Yoğurtçuoğlu et al., [35], n:36; In this study, n: 52). Type of P. anatolicusgrowth shows a negative allometric growth as the b value is below 3. The values of b were within the limits of 2.5-3.5 commonly reported for teleosts by Froese [17]. The relationships length- weight of the fish samples correlation coefficient R= 0,94.This situation exhibits important deviation expected regulation increase in length-weight relationships. In this study given basic information for this species that is not yet available in the literature. Further, studies are needed to compare growth and mortality of the species from different areas in their range of distribution. Because of this species is endangered, the number of sampling is very few. Also, There are no data on the growth of this species. Fish population responses to subsequent habitat variation are frequently unpredictable.Physical and chemical diversity in environment may explain variations in growth relationships [28]. Growth information for freshwater prior to Beyşehir Lake, land use changes, and urbanization would ultimately provide a useful comparison.Water pollution and fishing during the spawning period should be investigated and controlled whereas further studies should focus on direct or indirect age validation methods.In addition, the release of these aquatic ecosystems carnivorous and alien species are known to negatively affect many native fish populations [22,13]. The P.anatolicus population may be affected by the conditions negative processes because of this species has fragile population structure. Also, the population of this speciesdecreased depending on the habitat conditions in Gödet Dam Lake [30]. This situation is observed in Beysehir Lake for our study. Thusthis data allows sustainable management and regulation forP. anatolicus.

Table 1: Age-length key for Pseudophoxinus anatolicus collected in Beyşehir Lake Age Groups Length Groups I II III IV Total 13 4 4 14 3 1 4 15 3 3 16 1 5 6 17 1 2 3 18 2 3 5 19 5 3 8 20 5 3 8 21 2 5 7 22 1 1 2 23 1 1 24 1 1 Total 14 24 12 2 52 % 29.2 50.0 25.0 4.2 100 Mean Length 14.41±0.49 18.08±0.45 20.47±0.31 23.40±0.55 18.12±0.56 Mean Weight 52.9±4.24 103.9±6.43 139.0±8.37 194.0±8.40 111.9±7.78 F/M 1.6/1 0.8/1 1.7/1 1.0/1 1.2/1

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Fig. 1: Beyşehir lake which supplies the Pseudophoxinus anatolicus samples

Fig. 2: Pseudophoxinus anatolicus Length-weight relationship chart

-(-0.29) Fig. 3: Pseudophoxinus anatolicus von Bertalanffy growth equation graph (Lt= 23.93-exp 0.63(t )

CONCLUSION

In this study, growth parameters for the fish species were determined by statistically acceptable results. The parameters gained by this research the first data on the growth characteristic of endemic P. anatolicus from Beyşehir Lake (Turkey) provide an insight species of protection studies and regulations.In addition, these results can be used as a reference for the stocks in other inland water basins in the region.There is an urgent need to address biodiversity issues in the region, particularly in relation fish species,as P. anatolicus with fragile stock structure, usage in stock enhancement practices. As a conclusion that some factual information was offered by this study in terms of fishery and resource managers.Despite P. anatolicus was almost extinct, the population were located in intermediary channel of the Beyşehir Lake.It isn’t possible the presence of this species in main basin. About the genereal situation of the population may be mentioned from fragile structure. Because, especially this population was consisted of individuals in younger age groups. This issue should be considered in terms of continuity of the species.

ACKNOWLEDGEMENTS

Due to sample fish in providing special support thanks to Assoc. Prof. Dr. Abdullah Öksüz.

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