Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin
Cobitis faridpaki Cobitis faridpaki (Mousavi-Sabet, Vasil'eva, Vatandoust and Vasil'ev, 2011) is found in streams of the Siahrud River in the southeastern Caspian Sea basin, and this is the first report on reproductive parameters of the newly described endemic loach. Reproductive conditi...
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| Format: | Article |
| Language: | English |
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University of Guilan
2012-10-01
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| Series: | Caspian Journal of Environmental Sciences |
| Subjects: | |
| Online Access: | https://cjes.guilan.ac.ir/article_1081.html |
| _version_ | 1818038966966812672 |
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| author | Mousavi-Sabet, H. Kamali, A. Soltani, M. Bani, A. Rostami, H. |
| author_facet | Mousavi-Sabet, H. Kamali, A. Soltani, M. Bani, A. Rostami, H. |
| author_sort | Mousavi-Sabet, H. |
| collection | DOAJ |
| description | Cobitis faridpaki Cobitis faridpaki (Mousavi-Sabet, Vasil'eva, Vatandoust and Vasil'ev, 2011) is found in
streams of the Siahrud River in the southeastern Caspian Sea basin, and this is the first report on
reproductive parameters of the newly described endemic loach. Reproductive conditions are key
parameters of fish populations, and their assessment is very important for endemic fishes. To study
reproduction biology of this fish, sampling was done at monthly intervals throughout the year and 258
individuals of Cobitis faridpaki, were caught from Siahrud River in the southeastern Caspian Sea basin, in
the north of Iran. Age, sex ratio, fecundity, oocytes diameter and gonadosomatic index were estimated. A
regression analysis was used to find relationships between fecundity and fish size (length and weight),
gonad weight and age. Sex ratio differed significantly from unity and was biased to females. The mature
females and males were longer than 40 and 30 mm in total length, and +2 and +1 in age, respectively. The
average egg diameter was 0.578 mm. Spawning took place from beginning of May to late July when water
temperature was between 19.4 to 25.1 °C. Average GSI value at the beginning of the reproduction period
was 9.12% and ranged between 2% to 20% in ripe mature females. The averages of absolute and relative
fecundity were calculated as 1366 and 508, respectively. The absolute fecundity was significantly related to
body weight and gonad weight. Based on the pattern of gonadosomatic index, it was concluded that this
fish has a prolonged active reproduction period, which is a type of adaptation of short-lived small fishes to
environmental conditions. |
| first_indexed | 2024-12-10T07:51:09Z |
| format | Article |
| id | doaj.art-9ccde3af07584040b9158c1c63b67104 |
| institution | Directory Open Access Journal |
| issn | 1735-3033 1735-3866 |
| language | English |
| last_indexed | 2024-12-10T07:51:09Z |
| publishDate | 2012-10-01 |
| publisher | University of Guilan |
| record_format | Article |
| series | Caspian Journal of Environmental Sciences |
| spelling | doaj.art-9ccde3af07584040b9158c1c63b671042022-12-22T01:57:02ZengUniversity of GuilanCaspian Journal of Environmental Sciences1735-30331735-38662012-10-011011523Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basinMousavi-Sabet, H.Kamali, A.Soltani, M.Bani, A.Rostami, H.Cobitis faridpaki Cobitis faridpaki (Mousavi-Sabet, Vasil'eva, Vatandoust and Vasil'ev, 2011) is found in streams of the Siahrud River in the southeastern Caspian Sea basin, and this is the first report on reproductive parameters of the newly described endemic loach. Reproductive conditions are key parameters of fish populations, and their assessment is very important for endemic fishes. To study reproduction biology of this fish, sampling was done at monthly intervals throughout the year and 258 individuals of Cobitis faridpaki, were caught from Siahrud River in the southeastern Caspian Sea basin, in the north of Iran. Age, sex ratio, fecundity, oocytes diameter and gonadosomatic index were estimated. A regression analysis was used to find relationships between fecundity and fish size (length and weight), gonad weight and age. Sex ratio differed significantly from unity and was biased to females. The mature females and males were longer than 40 and 30 mm in total length, and +2 and +1 in age, respectively. The average egg diameter was 0.578 mm. Spawning took place from beginning of May to late July when water temperature was between 19.4 to 25.1 °C. Average GSI value at the beginning of the reproduction period was 9.12% and ranged between 2% to 20% in ripe mature females. The averages of absolute and relative fecundity were calculated as 1366 and 508, respectively. The absolute fecundity was significantly related to body weight and gonad weight. Based on the pattern of gonadosomatic index, it was concluded that this fish has a prolonged active reproduction period, which is a type of adaptation of short-lived small fishes to environmental conditions.https://cjes.guilan.ac.ir/article_1081.htmlIranLoachOvaryOocytes diameterReproductive biology |
| spellingShingle | Mousavi-Sabet, H. Kamali, A. Soltani, M. Bani, A. Rostami, H. Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin Caspian Journal of Environmental Sciences Iran Loach Ovary Oocytes diameter Reproductive biology |
| title | Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin |
| title_full | Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin |
| title_fullStr | Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin |
| title_full_unstemmed | Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin |
| title_short | Age, sex ratio, spawning season, gonadosomatic index, and fecundity of Cobitis faridpaki (Actinopterygii, Cobitidae) from the Siahrud River in the southeastern Caspian Sea basin |
| title_sort | age sex ratio spawning season gonadosomatic index and fecundity of cobitis faridpaki actinopterygii cobitidae from the siahrud river in the southeastern caspian sea basin |
| topic | Iran Loach Ovary Oocytes diameter Reproductive biology |
| url | https://cjes.guilan.ac.ir/article_1081.html |
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