فهرست مطالب

Ichthyology - Volume:5 Issue: 2, Jun 2018

Iranian Journal of Ichthyology
Volume:5 Issue: 2, Jun 2018

  • تاریخ انتشار: 1397/04/15
  • تعداد عناوین: 7
|
  • Manickam Raja, Pachiappan Perumal Pages 86-95
    The aim of the study was to investigate the variation in diversity and abundance of food items in Hemibagrus punctatus in relation to season and also to assess its food preference and feeding behaviour which may reflect the availability of prey items in upstream and downstream areas of Hogenakkal area under the Cauvery river systems. Through its stomach content analysis, the fish has been found to be omnivorous and euryphagous, with only a few qualitative differences in the diet. Feeding rate was found to vary in relation to monsoon caused environmental changes during the course of a year. Among the wide variety of prey consumed, juvenile fishes (39.88%) formed an important dietary component. The next major food group was insects (19.50%) followed by diatoms (11.54%), green algae (8.40%), crustaceans (7.29%), blue green algae (3.98%), plant matter (2.79%), worms (2.71%), copepods (1.33%), cladocerans (1.33%), and mollusks (1.33%). All the food items of this fish (% of food- composition) was found vary in monthly. The present findings would facilitate the examination of complex food and feeding regimes of fishes and would help identify the groups of species that use similar resources within a specific community and could also serve as a reference database for feeding ecology of fishes in highly impacted tropical habitats.
    Keywords: Siluriformes, Feeding ecology, Abundance, Preference, Tropical habitats
  • Manoochehr Nasri, Soheil Eagderi, Yazdan Keivany, Hamid Farahmand, Salar Dorafshan, Hassan Nezhadheydari Pages 96-108
    This work aimed to study some meristic and morphometric variations among Cyprinion of Iran to find new morphological differences and phenotype plasticity among them. Specimens of six reported species were collected from five Iranian inland water basins. 10 meristics were counted, 12 morphometric were measured and 17 ratios were calculated. The multivariate analysis of variance/canonical variate analysis was used for group comparisons. The meristic and morphometric characters of C. microphthalmum and C. watsoni were widely overlapping and could not distinguish the species. In case of C. kais, it is distinguished from others by having the least head depth, the largest body depth at dorsal fin origin, the most dorsal fin base length/SL, the most pectoral fin length/SL and the most dorsal fin height/SL ratios. Cyprinion milesi is a very distinct species from other congeners based on having the largest head height/body depth, the least body depth/SL, the least dorsal fin base length/SL, the least pectoral fin length/SL and the least dorsal fin height/SL ratios.
    Keywords: Biodiversity, Cyprinidae, Ichthyology, Inlandwater fishes, Morphology
  • Ali Taheri Mirghaed, Hoseinali Ebrahimzadeh Mousavi, Mehrnoosh Moeini Jazani, Hooman Rahmati- Holasoo, Abbas Bozorgnia Pages 109-117
    This study was carried out to investigate the parasite fauna of Chub, Squalius turcicus De Filippi, 1865 from the Siah, Neka and Haraz rivers of the Southern Caspian Sea basin in Iran, during 2015. Individuals of S. turcicus were caught by nets during the spring to winter of 2015. Fish were transferred to specific laboratory alive and then were used for parasitological investigations. Total percentage of parasites infection of Chub in the Haraz, Siah and Neka rivers were 48.7, 71.8 and 57.4%, respectively. Different parasite species including monogenean (Gyrodactylus mutabilitas, Dactylogyrus vistulae and Paradiplozoon), protozoa (Ichthyophthirius multifiliis and Trichodina sp.) and myxozoa (Myxobolus muelleri) were identified in the fish gill, intestine and skin. Significant differences were observed in the parasites’ prevalence among the rivers and seasons. Such differences may be due to impact of environmental conditions, especially water quality, on fish parasite fauna. This is the first report of M. muelleri in the intestine of S. turcicus in Iran.
    Keywords: Fish, Disease, Monogenean, Protozoa, Myxozoa
  • Omid Beyraghdar Kashkooli, Saeid Asadollah, Yaser Ahmadi Pages 118-125
    This study investigated the age and growth of Chondrostoma regium in upstream of the Zayandeh River by using different calcified structures (i.e. scale, otolith and vertebra). Also, the potential variability of age and growth estimates derived from different structures and their competency for further applications in population and life history studies of this species were statistically evaluated and compared. Based on the aging performed by using different calcified structures, C. regium specimens composed of 4 age groups of 2 to 5 years. Considering all aging structures (i.e., scale, otolith and vertebra) the major proportion of the sample was those within the age groups of 3 and 4. The von Bertalanffy’s growth models of C. regium was fitted separately for the data derived from each of the aging structures. Among all the fitted models, the scale-based model showed the smallest measures of the information criteria with AIC=296.88 and SBC=300.86. Based on all the statistical indices for model comparison, the von Bertalanffy’s growth model using the direct scale-based observations showed the most reliability and the best performance for growth parameters estimation of C. regium in this study. Hence, for C. regium inhabiting upstream of the Zayandeh River the most statistically sound von Bertalanffy’s growth equation could be written as Lt=303 (1-e–0.11 ( t–(-0.34))). Given the importance of growth studies in effective management and conservation of native fish populations as well as considering the highly changing and under pressure environment of the Zayandeh River, our study attempted to provide updated information on growth characteristics of C. regium in this aquatic ecosystem. The results of this study may help to improve our understanding of its population dynamics and may provide help in designing better conservational plans for this native species.
    Keywords: Aging, Bertalanffy models, Cypriniformes, Otoliths, Scales, Vertebra, Growth, Iran
  • Saroj Kumar Ghosh Pages 126-138
    Cytological status of olfactory epithelium during different reproductive phases of Eutropiichthys vacha (Hamilton, 1822) were described by light microscopy. The olfactory organ was composed of various lamella contained two principal layer: olfactory mucosa and central core, radiated from midline raphe. A sharp divergence existed between the mucosa of the olfactory lamella and raphe. The olfactory mucosa was distinguished into sensory and non-sensory epithelium, which consisted of polymorphism of receptors, supporting, labyrinth, mucous and basal cells. The central core was made up of loosely disposed connective tissue, nerve fibres and blood capillaries. A well-developed basement membrane was clearly distinguishable in between the olfactory epithelium and central core. The seasonal changes of the olfactory mucosa during growth, maturation, spawning and post-spawning phases was characterized by considering the tallness and architecture of the receptor cells as main criteria along with commute cellular features and staining patterns of different cell types. The structural components of the olfactory epithelium were correlated with the olfaction in the life of fish concerned.
    Keywords: Schilbeidae, Olfactory epithelium Histology, Annual cyclical changes, Receptor cells
  • Anbu Aravazhi Arunkumar, N. Vijaya Lakshmi, Arunachalam Manimekalan Pages 139-166
    This paper provides information on the osteological characterization of the genus Puntius with respect to six river systems of Southern Western Ghats. Fishes were collected using cast net, dip net, gill net and drag net from various streams and rivers of Southern Western Ghats. Clearing and staining methods was carried out for osteological study. After clearing and double staining, the specimens were observed under a stereomicroscope and photographed using a digital camera. Twenty-nine morphometric and meristic osteology characters were taken. Principal component analysis and cluster analysis were performed to group the species and to detect the similarity between the species. Comparing all the species it was observed that the species were grouped into three groups. The first class has 10 species P. mahecola, P. chola, P. bimaculatus, P. dorsalis, P. melanampyx, P. fasciatus, P. ticto, P. denisonii, P. sophore, P. conchonius. The second class has 4 species; P. filamentous, P. sarana spirulus, P.amphibious and P. ophicephalus. The third class has only one species P. carnaticus well supporting the observations of Shantakumar & Vishwanath (2006).
    Keywords: Chalakudy, Meristics, Morphometrics, Preethmoids, Skeleton, Skull
  • Segun Olayinka Oladipo, Lotanna M. Nneji, Abass Toba Anifowoshe, Ifeanyi C. Nneji, Oluyinka A. Iyiola, Adeniyi C. Adeola, Moshood K. Mustapha Pages 167-172
    Length-weight relationship and condition factor of seven freshwater fish species from Jebba Lake (Nigeria) were investigated. A total of 576 individuals were caught with hook and line, cast and gill nets from up and downstream sections of the lake. Sampling covered dry and raining seasons spanning across April to September 2017. The growth exponent b values of the studied species ranged between 2.23-3.89 and the condition factor between 0.47-1.61.
    Keywords: Barbus, Chrysichthys, Hydrocynus, Length weight relationship, Oreochromis