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2010 Fish Biology Congress Abstracts STUDING on DISTRIBUTION OF STUDING ON DISTRIBUTION OF SAND GOBY,NEOGOBIOUS FLUVIATILIS PALLASI IN THE SOUTH-WEST COASTAL OF CASPIAN SEA Abdollahpour Biria, Hamid Symposium: Fish as behavioral ecology models Presentation:oral Contact: Hamid Abdollahpour Biria, Islamic Azad University-Talesh branch, Rasht, Guilan Iran E-Mail: [email protected] Abstract: This study carried out on distribution of sand goby in the south- west coast of Caspian Sea (from Astara to Chaboksar) from October 2005 to September 2006 during 1 year. Samples were collected from 3 stations (Astara, Anzali, and Chaboksar coasts) from 0 to 15 meters of depth. They have been captured monthly by bottom trawl. It has been determind Caspian sand goby density per trawling and its relative and absolute Abundance in station.The minimum abundance (7.70% of total catch) took place in the study in January 2006 and the maximum abundance (32.85% of total catch) in December 2005. The minimum and maximum catch for sand gobies made up 9.98% and 41.64%, of the total catch respectively for Caspian Sea gobies area was recorded. A significant decrease in density of sand gobies was observed with an increas in depth. An interacting effect among the different factors was also seen (non-parametric Spearsman test) indicating that among depth, sampling station and depth- sampling station only depth influences on absolute density of the fish.Correlation coefficient between N.fluviatilis pallasi abundance and biotic factors and abiotic factors were tested using Spearman non- parametric test. Significant correlation was observed between abundance of sand goby and factors of total catch (0.703), abundance of gobies (0.672), temperature (0.683) and dissolved oxygen (0.419) at 99% confidence level, however negative correlations existed between abundance of sand goby and zooplankton (-0.300) (P<0.05) and phytoplanktons (-0.388) (P<0.01). No correlations were observed between abundance of sand goby, N. fluviatilis pallasi and other studied parameters. The closest linked factor (PCA) to absolute abundance and biomass of sand gobies (biomass) were gobies, total catch, temperature and dissolved oxygen in order of their reference and other factors were placed apart. POPULUTION STUDY OF SAND GOBY,NEOGOBIOUS FLUVIATILIS PALLASI IN THE SOUTH-WEST COASTAL OF CASPIAN SEA BY MORPHOLOGICAL CHARACTERISTICS. Abdollahpour Biria, Hamid Symposium: Fish as behavioral ecology models Presentation:oral Contact: Hamid Abdollahpour Biria, Islamic Azad University-Talesh branch, Rasht, Guilan Iran E-Mail: [email protected] 2010 Fish Biology Congress Abstracts Abstract: Caspian sand goby, Neogobius fluviatilis pallasi belongs to Gobiid family that has importance role in food cycle of Caspian Sea because of their high staks and not catching. This study has been done on the fish at south-west coasts of Caspian sea (west,centre and east areas)in Guilan province from oct.2005 untile sept.2006. Samples were collected from 4 stations (Astara, Anzali, Chamkhaleh and Chaboksar coasts) from coast to15 meters depth by bottom trawl,monthly.Result of differential function analysis on corrected Morphometric charactery showed 3 functions %51.3 ,%28.4 and %20.3 , respectively and sam of differentiative function percentage calculated %80 which it determine changed among groups.Detective figures of two functions showed that studied samples in Astara station was completely different from other regions and was similar to Anzali station only at several points. Chamkhaleh and Astara station were the same,but Chaboksar station was a separated group. Analysis of differential functions for studied characteristics includes meanly 86.3 of population that the most amount of it belongs to Astara station with 93.3 % and Anzali with 90%.and the The minimum amount belongs to Chamkhaleh with 79.3%.The results showed that Neogobius fluviatilis pallasi probably has 3 different populations in coasts of Guilan province, include Astara, Anzali ,Chamkhaleh and Chaboksar populations. FEEDING HABITS OF NEUGOBIUS MELANOSTOMUS AT SOUTH COAST OF CASPIAN SEA Abdollhpour Beria, Hamid Symposium: Contributed Papers Presentation:oral Contact: Hamid Abdollahpour Biria, Islamic Azad University-Talesh branch, Rasht, Guilan Iran E-Mail: [email protected] Abstract: The Caspian Sea gobidies fish due to using the baits that is unavailable for other fishes and also is as competitor for bentophagus, used as main food for predator fishes such as beluga Huso huso, Perch (Perca fluviatilis), clupei, and also birds, because of increase in production of marine fish have many ecological importances. Moreover, these fishes used for as bait for capturing predator fishes, providing fish meal, medicine consuming, and also sporting capture especially in port area have importance. There are a few studies on gobiidae. Recent study has carried out for completing the information about feeding one species of gobiidae. Sampling of black mouth gobies was carried out from 3 stations include west (Astara coast), central (Anzali coast) and east (Chaboksar coast) that located in the west south of the Caspian Sea (Iranian coasts).The depth of sampling in each three stations was different and include 0 – 5 m, 5 – 10 m and 10 – 15 m and carried out during 2008 monthly captured by special bed trawl and then transferred to laboratory for their feeding behavior studding.Results showed that the empty index of elementary tract increased with increasing temperature because of decrease in nutritional activity of breeders in spawning season (summer and winter).Relative gut length showed no difference with changing age, genus and station.Feed intensity index has no different between two species but showed some differences based on station. Recent study showed that the black mouth gobies is a carnivore species and generally consume benthos specially mollusks and crustacean.By notice to kind of animal and feeding regimes (21 kinds) could be said that black sea gobies is a carnivore species and benthophagous and prefer to called mollusk – crustaceanphagous an also uryphagous.Food preferable index of gobies showed that this species has not any main food at Iranian coastal of the Caspian Sea. RELATION BETWEEN STRESS COPING STYLE, LARVAL DEVELOPMENT AND TIME TO EMERGANCE IN RAINBOW TROUT (ONCORHYNCHUS MYKISS) Åberg, Madelene, Uniza Kahn, John Fleng Steffensen, Øyvind Øverli, Hans Magnus Gjoen and Erik Höglund 2010 Fish Biology Congress Abstracts Symposium: Social interaction physiology in fish Presentation:Poster Contact: Madelene Åberg, DTU AQUA, Nordsoen Forskerpark, Postbpx 101., Hirshals, 9850 Denmark E-Mail: [email protected] Abstract: Proactive and reactive stress coping styles is widespread amongst animal groups. Reactive individuals are generally shy and subordinate whereas proactive individuals show the opposite behavior. In salmonids, differences in larval development have been related to these styles. In this study we investigated larval development and time to emergence in two strains of Rainbow trout selected for low (LR) and high (HR) post stress plasma cortisol levels. These strains have previously been characterized with proactive and reactive stress coping, respectively. A line specific SNP was used to distinguish the emerging larvae and a clear link between stress coping style and emergence time was demonstrated by LR larvae emerging earlier than HR larvae. LR larvae also had more yolk reserves at the time of emergence. Establishing territories and energy reserves are important factors for inducing social dominance, raising the question about the effect of initial social experience in shaping Salmonide behavioral profiles PEPTIDES INVOLVED IN FOOD INTAKE REGULATION IN FISH CHANGE THEIR EXPRESSION IN GLUCOSENSING AREAS (HYPOTHALAMUS AND HINDBRAIN) OF RAINBOW TROUT AFTER LEPTIN TREATMENT Aguilar, A.J., Conde-Sieira, M., Muñoz, J.L., López-Patiño, M.A., Soengas, J.L. Symposium: Physiology of fish in aquaculture Presentation:Poster Contact: Jose Luis Soengas, Laboratorio de Fisioloxia Animal, Facultade de Bioloxia, Edificio de Ciencias, Universidade de Vigo, Vigo, Pontevedra 36310 Spain E-Mail: [email protected] Abstract: In mammals the regulatory role of leptin in energy homeostasis is mediated via hypothalamus since leptin influences production of orexigenic (NPY, AgRP) and anorexigenic (POMC, CART) neuropeptides in glucosensing neurons that integrate glucose, leptin, and insulin signalling. In fish, we demonstrated a regulatory role for leptin in glucosensing areas compatible with the anorectic effect of that hormone but there is no information regarding its effects on peptide production. Therefore, pools of 3-4 hypothalami and hindbrain of rainbow trout were incubated at 16ºC for 1 h with modified Hanks’ medium containing 2, 4 or 8 mM D-glucose alone (controls) or containing leptin (160 ng/µl) or leptin plus 50 nM wortmannin or leptin plus 5000 nM AG 490. The number of independent experiments carried out was four. Changes in the expression of NPY, POMC, CART, and CRF (assessed by qRT- PCR) are discussed related to the anorectic regulatory role of leptin in fish IMPACTS OF MODIFICATION ON SMALL STREAMS REACHES TO TROPICAL FRESHWATER FISH DIVERSITY IN PENINSULAR MALAYSIA Ahmad, A.B. and Magurran, A.E. Symposium: Tropical fish: diversity and adaptation Presentation:Poster Contact: Amirrudin B. Ahmad, School of Biology, Scottish Ocean Institute, University of St Andrews, St Andrews, Scotland KY16 8LB UK E-Mail: [email protected] Abstract: Habitat modification of small headwater lowland streams
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