Fisheries
Zaniar Ghafouri; Soheil Eagderi; Hadi Poorbagher
Abstract
This study was conducted to investigate the sexual dimorphism of Cyprinion macrostomum in the Little Zab River using traditional and geometric morphometric methods. For this purpose, during 2021, 37 specimens (21 females and 16 males) were collected using an electrofishing device. After determining the ...
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This study was conducted to investigate the sexual dimorphism of Cyprinion macrostomum in the Little Zab River using traditional and geometric morphometric methods. For this purpose, during 2021, 37 specimens (21 females and 16 males) were collected using an electrofishing device. After determining the sex of the collected specimens, 18 morphometric characteristics were measured using a digital caliper. Also, to extract body shape data in geometric method, photographs were taken from the left sides of both males and females. Then, 16 landmark-points were digitized in tpsDig2 software. The extracted data were analyzed using multivariate statistical analysis including principal component analysis (PCA), T.tests and Mann-Whitney.The results of discriminant function analysis (DFA) and T-test of the body shape showed a significant difference between males and females (P<0.05). The males have more body depth, posterior snout, and shorter caudal peduncle length than the females. Males and females had significant differences in 8 morphometric traits (P<0.05). The results of the present study confirmed the performance of traditional and geometric morphometric methods in the differentiation of the C. macrostomum sexes.
Omid Tabiee; Hadi Poorbagher; Hamed Rafiee
Abstract
The economic value of the sport fishing valuable species such as Caspian brown trout (Salmo caspius, Kessler, 1877), is estimated based on the determination of the amount of money that fishermen tends to pay for fish catching. The aim of this research was to estimate the willingness to pay (WTP) of anglers ...
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The economic value of the sport fishing valuable species such as Caspian brown trout (Salmo caspius, Kessler, 1877), is estimated based on the determination of the amount of money that fishermen tends to pay for fish catching. The aim of this research was to estimate the willingness to pay (WTP) of anglers to the conservation of the endangered Caspian brown trout, in order to determine the conservation value of Caspian brown trout. In order to do this research, from 2018 to 2020, 444 anglers were selected by random sampling method. Data gathering tool was a researcher-made questionnaire comprising items about the angling demographic characteristics as well as their WTP for the protection of the endangered species of Caspian trout. Eventually, analysis of gathering data was carried out with applying a Logit model under maximum likelihood procedure by using SPSS (version 21) and Eviews (10) Software. The result showed that 75 percent of the anglers had a positive WTP for the protection of the endangered species of Caspian trout. The average payment of WTP for the monthly and annual protection value of Caspian trout was estimated 1979.2 and 23750.4 million RLs respectively, which is much higher than that of the penalty for illegal fishing (120.5 million RLs). According to the results of this research, the variables of the literacy level, income, job, membership in the environmental organization, species recognition and bid have positive effects on the WTP for the protection of endangered species of Caspian trout.
