Mojtaba Pouladi; Seyed Yousef Paighambari; Russell Brian Millar; Manoochehr Babanezhad
Articles in Press, Accepted Manuscript, Available Online from 01 April 2020
Abstract
The main purpose of this study was to investigate gillnet catch composition and biodiversity caught by 130, 140, and 150 mm (STR) mesh sizes during the fishing season. This research was conducted in the fishing ground of Bushehr County located in the Persian Gulf from autumn 2018 to spring 2019. Overall, ...
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The main purpose of this study was to investigate gillnet catch composition and biodiversity caught by 130, 140, and 150 mm (STR) mesh sizes during the fishing season. This research was conducted in the fishing ground of Bushehr County located in the Persian Gulf from autumn 2018 to spring 2019. Overall, 23 families including 36 genera and 43 species were identified. Spring season with 42 species and winter season with 32 species showed the highest and lowest species biodiversity, respectively. Carangidae family with 7 genera and 8 species, Scombridae family with 3 genera and 4 species, and Dasyatidae with 3 genera and 4 species were the families with the highest species biodiversity. Scomberomorus commerson and Thunnus tonggol with 23.45% and 21.84% in autumn, 20.15% and 25.85% in winter, 21.9% and 19.78% in spring showed the most abundance percentages, respectively. The 130 mm mesh size and spring season had the highest abundance, diversity, and the number of caught species in comparison with other mesh sizes and seasons. Two-ways ANOVA results showed that the effects of mesh sizes and seasons on the calculated metrics were significant (P0.05). The highest and lowest Jaccard (J) and Sørensen (S) seasonal similarities were between autumn and spring (J: 0.805, S: 0.892) and autumn and winter (J: 0.561, S: 0.719), respectively. The results of non-metric multidimensional scaling analysis showed that 130 and 140 mm mesh sizes had overlap in terms of the fish abundance and catch composition. Cluster analysis also showed the highest similarity between S. commerson and T. tonggol, and Euthynnus affinis and Scomberoides commersonnianus.
Seyyed Yousef Paighambari; Mohsen Ghaed Mohammadi; Hadi Raeisi; Mojtaba Pouladi
Volume 4, Issue 1 , Winter 2020, , Pages 18-28
Abstract
This investigation was conducted in Doroudzan Dam located in Fars province from winter 2017 to summer 2018. The fish specimens were caught using monofilament gillnet with 20, 70, 100 and 120 mm mesh sizes. Overall, 283 fish specimens belong to the Cyprinidae (7 species) and Mugilidae families (1 species) ...
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This investigation was conducted in Doroudzan Dam located in Fars province from winter 2017 to summer 2018. The fish specimens were caught using monofilament gillnet with 20, 70, 100 and 120 mm mesh sizes. Overall, 283 fish specimens belong to the Cyprinidae (7 species) and Mugilidae families (1 species) were caught which were included: Cyprinus carpio, Carassius gibelio, Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, Alburnus mossulensis, Capoeta damascina, Carasobarbus luteus and Planiliza abu. C. carpio and P. abu were dominant species during sampling seasons.The highest range of total length and weight belonged to H. nobilis (Length range: 52.8-102.6 cm; Weight range: 2811.5-20628.9 g) and the lowest ranges belonged to A. mossulensis (Length range: 8.6-15.1 cm; Weight range: 5.05-29.4 g) and P. abu (Length range: 8.3-19.6 cm; Weight range: 4.52-59.48 g). The highest amounts of the Shannon-Wiener and Simpson indices were observed in spring (2.413) and winter (0.795), respectively. PCA result showed that C. carpio and P. abu were the most effective species that caused the changes in the seasonal fish abundance and diversity. Also, the most amounts of seasonal similarity were between summer and spring (J= 0.625; S= 0.729) and the lowest amounts were between summer and winter (J= 0.375; S= 0.545).