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  • 1
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    Investigation of morphometric and meristic characters of the Caspian Lamprey (Caspiomyzon wagneri) during migration season in Shirud and Talar Rivers (2018)
    Details
    Publication Date: 2021-05-19
    Description: We studied the morphological characteristics of the Caspian Lamprey (Caspiomyzon wagneri) in two rivers of Shirud and Talar during the spring migration in 2006. A total of 91 specimens were collected using hand and cast net. Relative morphometric characters including disc length, head depth, eye length, prebranchial length, head length, distance between disc and posterior end of the first dorsal fin, distance between disc and base of second dorsal fin, distance between disc and anus, post branchial length, tail length, interocular distance, and post ocular length showed significant differences between the two populations (P less than or equal to 0.05), but meristic characters showed no significant differences (P greater than or equal to 0.05). Although some of the relative morphometric characters showed differences between the two populations of the rivers, but the populations were not different based on the principal components analysis (PCA) and had a relatively high overlap.
    Description: Published
    Keywords: Meristic counts ; Rivers ; Lamprey ; Principal Component Analysis ; Bases ; Caspiomyzon wagneri ; Brackish ; Animal morphology ; Animal populations ; Fisheries ; Migration
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.147-162
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  • 2
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    Validation of back-calculation methods using otoliths to determine the length of anchovy kilka (Clupeonella engrauliformis) (2021)
    In:  http://aquaticcommons.org/id/eprint/22340 | 18721 | 2018-03-22 19:26:24 | 22340 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-03
    Description: Age structure of the Caspian Sea anchovy kilka, Clupeonella engrauliformis, was estimated for the first time by back-calculation methods. Otolith growth and the rate of increment in anchovy kilka were examined to determine whether otoliths could be used to back calculate body sizes at various life stages. Sampling was carried out on commercial fishing vessels board along the Iranian coast in 2007. The age structure of the samples ranged from 2 to 7 years old which was dominated by the third year class (38.6%). The largest fish measured was 137.2mm fork length. The relationship between fork length (FL) and otolith radius (OR) was described by the following equation: FL=13.77+ 82.78*OR (r^2=0.92). Three proportional back-calculation methods, Fraser-Lee, Whitney & Carlander and Dahl-Lea models, were compared by using data sets of anchovy kilka otoliths, and we validated back calculation by comparing them with observed lengths. Back calculated lengths generally corresponded well with observed lengths in anchovy kilka age classes. Variance of the back calculated length data obtained from three models indicated no significant difference (P〉0.05).
    Keywords: Biology ; Fisheries ; Clupeonella engrauliformis ; Otolith ; Back-calculation ; Age structure ; Caspian Sea ; Iran ; anchovy kilka
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 115-126
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  • 3
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    Distribution pattern of coral & non coralline fish larvae in Khark & Kharko (Persian Gulf) (2021)
    In:  http://aquaticcommons.org/id/eprint/22364 | 18721 | 2018-03-28 22:09:25 | 22364 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: Khark and Kharko Islands are located at far northern point of fringing coral reefs in the Iranian coast of the Persian Gulf. These coralline are the habitats of the wildlife refuge with total area of 2400ha and located in the territory of Bushehr province. The present study was carried out from July 2006 to June 2007 over 12 stations. Sampling was conducted obliquely from bottom using Bongo-net plankton sampler with 500µ of mesh size. In total, 1808 specimens, both in pre and post flexion stages were collected and examined. They were belonging to 45 families from different ecological groups (21 coralline and 24 non coralline fish larvae families ). 96% of examined fish larvae were in preflexion stage. Some families are new ones from the area . Among identified families, Clupeidae, Blenniidae, Sillaginidae, Atherinidae and Tripterygiidae were dominant families in studied area and the peaks were estimated in spring. The mean abundance of total fish larvae was 18.71 per 10m² of sea surface. The most abundant families were Clupeidae, Sillaginidae, Blenniidae, Atherinidae and Tripterygiidae in which comprised 65% of fish larvae. Abundance in spring showed significant difference with other seasons. The distribution pattern of fish larvae changed seasonally in both groups, increasing in east coasts of Khark Island and in three coastal stations during summer and autumn and in west coast of Khark in spring. The distribution of fish larvae seemed to be correlated to sea currents.
    Description: Article includes abstract in Farsi on last page.
    Keywords: Biology ; Fisheries ; Coralline fish larvae ; Abundance ; Khark and Kharko Islands ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 173-184
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  • 4
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    Reproduction characteristics of the Vimba vimba persa (Pallas, 1811), in coastal waters of the Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22463 | 18721 | 2018-04-10 20:58:19 | 22463 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-06
    Description: Some reproduction characteristics of the Caspian Vimba, Vimba vimba persa, were studied from Oct. 2008 to Sep. 2009 in coastal waters of the Caspian Sea (Mazandaran province). 994 specimens were monthly collected from 6 fish landing sites of Ramsar, Tonekabon, Chalus, Mahmood Abad, Sari and Behshahr. The fecundity was measured using 92 specimens. This species was found to have more abundance in spring (especially April and May). The samples composed of 397(42.6%) male, 537(57.4%) female; the sex ratio was M:F = 1:1.35. The advanced stages of maturity (4th & 5th) were found in April and May. The highest Gonadosomatic Index in females was in May and the lowest one was in July. The average of absolute and relative fecundities was 17198±7710 and 171.85±48.8, respectively.
    Description: Article includes abstract in Farsi on last page.
    Keywords: Biology ; Fisheries ; Caspian Vimba ; Vimba vimba persa ; Fecundity ; GSI ; Sex ratio ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 585-595
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