Yazdan Keivany; Mahmood Banimasani; Eisa Ebrahimi
Abstract
In order to compare the geometric morphometrics of teilehkhus (Capoeta capoeta) populations, 713 specimens from 32 rivers in Caspian Sea, Urmia and Harirud basins were examined. Specimens were anesthetized in 1% clove oil solution after catching by a seine net and fixed in 10% formalin and transfered ...
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In order to compare the geometric morphometrics of teilehkhus (Capoeta capoeta) populations, 713 specimens from 32 rivers in Caspian Sea, Urmia and Harirud basins were examined. Specimens were anesthetized in 1% clove oil solution after catching by a seine net and fixed in 10% formalin and transfered to laboratory for further studies. The specimens were photographed in a sililar condition by a Cannon 8MP and land marked in Tpsdig2 software. Superimposition of the landmarks was performed by Procrustes analysis to eliminate non-shape variations in TpsRelw. The Canonical Variate Ana;ysis (CVA) results of geometric morphometry showed significant differences among the populations and Harirud population was fully separated from Urmia populations. Caspia Sea population overlapped the both other populations. The Cluster Analysis (CA) grouped Harirud and Caspian Sea populations as a separate group from Urmia population, indication a more similarity between the Harirud and Caspian Sea populations. However, for more details, molecular studies are needed.
animal
Mosayeb Aalipour; Yazdan Keivany; Eisa Ebrahimi
Abstract
in the inland waters of Iran and little is known about this species in Iranian waters. In this study, some biological characteristics of rainbow trout (Oncorhynchus mykiss) as an exotic fish were examined in 355 specimens collected monthly from Beheshtabad River of Chaharmahal & Bakhtiari Province ...
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in the inland waters of Iran and little is known about this species in Iranian waters. In this study, some biological characteristics of rainbow trout (Oncorhynchus mykiss) as an exotic fish were examined in 355 specimens collected monthly from Beheshtabad River of Chaharmahal & Bakhtiari Province during April 2013 to March 2014. Total length of females and males ranged from 17.1 to 40.2 cm (26.05±4.54SD) and from 15.5 to 40.3 cm (24.9±5.93), respectively. Among all the examined stomachs, 39 were empty (Vacuity index, Vi= 11%). This variation was not significantly diffrent (P˃0.05) over the year and the maximum number of empty stomachs was recorded during the spring and the minimum during the autumn. The diet of the rainbow trout was composed of 45 different prey taxa, belonging to 10 main classes. The most important prey items were Annelida (Oligochaeta and Hirudinea), Platyhelminthes (Turbellaria), Arthropoda (Crustacea, Insecta and Archanida), Mollusca (Gastropoda and Lamellibranchiata), Coelenterata (Cnidaria) and Teleostei. Hirudinea, Crustacea, Insecta, Gastropoda, Teleostei and Lamellibranchiata were the most important prey items in all seasons. Crustacea, Insecta, Gastropoda and Teleostei were the most important prey items in all months. Sex did not appear to have any significant effects on the diet composition and on the main prey items consumed by the fish. Fish size showed significant effects on diet composition and the average size of prey increased with fish size. The rainbow trout could be considered a carnivorous fish, feeding on a wide range of prey items.
