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  • 1
    Publication Date: 2018-07-18
    Description: Encrasicholina punctifer is one of the dominant small pelagic and economically most important fishes of the Persian Gulf, especially in Qeshm Island's coastal waters. Specimens of the fish were collected monthly from the fishing area in the coastal waters of Qeshm Island by random sampling method. Investigation on biological parameters of E. punctifer continued from April 2005 to March 2006. E. punctifer is mainly caught by double-boat purse seine in this area. Reproductive studies showed that maturity season of the fish occur in August. The sex ratio fulfill the theoretical 1:1 (P〉0.05). L sub(M50) was attained at a total length of 84 mm. The absolute fecundity was estimated at 1217 plus or minus 331. We showed that the species is planktonivore, its diet consisted of a board spectrum of food types, but crustaceans dominated the food with copepods and their eggs, naplius and semi digested copepods constituting 54% of the diet. The next major food groups found in the diet of the fish were Cyanophyceae 21%, Bacillariophyceae 11%, fish egg and scale 6%, Dinophyceae 4%, with Euglenahyceae, Chiorophyta, Dinoflagellates and others items consisting only 4% of the diet. Analysis of monthly variation in the stomach fullness indicated that feeding intensity fluctuated throughout the year, with the highest value in winter. Vacuity Index indicated this species was of semi-voracious appetite fishes.
    Keywords: Biology ; Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 2
    Publication Date: 2018-09-07
    Description: This project was carried out from November 2008 for about two years. Seven laboratories of the research center including: Chromatography, Instrumental Analysis, Aquatic zoology, Sample preparation, Histology, Plankton and Benthos were selected for the accreditation. The quality manual of the test laboratories was written following the general requirements of ISO/IEC 17025. During the establishment of the system standardization of the test methods, calibration of the equipment, test methods validation, uncertainty estimation of measurement and update and improvement of physical conditions of the laboratories were performed. The technical and quality management competence of the laboratories were evaluated by the auditors from DGA (the German Accreditation System for Testing Laboratories), which is signatory of ILAC (International Laboratory Accreditation Co-operation). The laboratories officially accredited by DGA, after the successful completion of the accreditation process (including implementation of corrective actions for the detected nonconformities). The accreditation is valid from 2009-11-12 to 2014-11-11. Production of reliable results of the test methods from national and international scientific organizations' point of view as well as facilitation in development of bilateral and multilateral relations with them can be considered as the advantages of the system establishment. Moreover, exchange of the relevant scientific information and experiences among the researchers will be facilitated.
    Keywords: Information Management
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 3
    Publication Date: 2018-10-13
    Description: The most important habitats of mudskippers are muddy areas in tidal zone of tropical mangrove forests. Mudskippers are related to Oxudercinae subfamily of Gobiid fishes. Three most distributed species of Hormozgan mudskippers were Periophthalmus waltoni, Boleophthalmus dussumieri and Scartelaos tenuis. These fishes can be considered as euryhaline and eurythermal aquatic species, because they can tolerate a wide range of salinity and temperature. A research was done since september 2008 to september 2009 in two important mangrove regions of Hormuzgan (Tyab and Khamir) to determine some ecological characteristics of inhabited mudskipper species. Results showed that nitrate levels are significantly different between tidal lines and seasons (P〈0.05). Maximum nitrite concentrations were recorded 53.2 and 92.5 µg/l in Khamir and Tyab respectively. The annual correlation matrix showed that a positive correlation between phosphate concentration and nitrite and silicate (P〈0.05). Silicate concentration was very high, because of too low density of diatoms and radiolarians. Some species of diatoms, dinoflagellates, cyanobacteria and larvae of crustacea and echinoderms were observed with different density and diversity. Sediment composition of the studied areas were categorized in three classes (clay, sand and clay - sand). Polychaetes formed dominant group of benthic fauna in Tyab and Khamir areas. High density of capitellid worms was possibly related to some environmntal stress caused by activity of fishing and cargo vessels. It was not observed significant difference between fishes length in two areas (P〈0.05); Mean lengths of P. waltoni, B. dussumieri and S. tenuis were calculated 9.85, 14.7 and 11.5 cm respectively. Spawning period of each three species in both areas were obtained from late winter to late spring based on gonadosomatic index values. Male to female sex ratio of P. waltoni, B. dussumieri and S. tenuis were calculated 1:0.45, 1:0.41and 1:0.74 respectively. Absolute fecundity of P. waltoni, B. dussumieri and S. tenuis were estimated 3558 ± 2202, 3952 ± 1030 and 6742 ± 1939 respectively. P. waltoni feeds mainly on fiddler crab, S. tenuis uses crustaceans and gastropods and B. dussumieri has a vegetarian diet.
    Keywords: Ecology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 4
    Publication Date: 2018-07-12
    Description: During the project of "Stock assessment of mesopelagic resources with Acoustic method", the feeding of lantern fishes was studied and it was found out that they are specified zoophagous. The most abundant of their stomach contents contain Copepods and Ostracods and with less important, the other stomach contents were Brachyuran larvae, Tintinnids, polychaeta, chaetognatha, Appendicularia, Lamellibranchia, shrimp's larvae, different lchthioplankton, crustacean appendages, juvenile squids and some other unidentified zooplankton. The Diatoms (as a random food) were rarely found in their stomachs. Also, small and juvenile lantern fishes formed a part of their stomach contents and it proved the cannibalism behavior of this fish. This behavior occurs mostly during daytime but the main time of myctophid's feeding occurs during night time.
    Keywords: Biology
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 5
    Publication Date: 2018-08-26
    Description: Hydrology and Hydro-biological monitoring in the Northeast Persian Gulf and strait of Hormuz (Hormozgan Province waters) were conducted during 2003-2004.The project was implemented using R/V Ferdous.The sampling area included the stretch of the Iranian waters along the northeast part of the Persian Gulf and Strait of Hormuz in Hormuzgan province. Along this stretch 7 equally distributed transect at a distance of 40 miles from one another were designated; 3 main sampling stations at a distance of 20 miles from one another were fixed at each transect. Sampling was conducted twice per annun from Feb. 2003 to Feb. 2004. Summer & winter values of some Physico-chemical factors in surface layers of Hormozgan waters were recorded as follows: Temprature 33±0.082 , 21.8±0.67 ?c ; EC 66.1±1.52 , 53.3±0.66ms/cm ; Salinity 37.9±0.54, 37.8±1.6 ppt , Density 22.9±0.39 , 25.5±0.99 kg/m^3, Dissolved oxygen 5.4±0.26 , 6.7±0.35 ppm ; pH 8.2±0.02 , 8±0.03 ; chlorophyll-a 0.7±0.4 , 1.3±0.72 mg/m^3 and Turbidity 6.1±0.92 , 5.7±0.67 FTU. According to the result a seasonal thermocline appears in the Iranian waters during summer and disappear during winter, extended with its maximum formation in summer. The temperature differences between surface and bottom waters was 12?C. The thermocline diminishes near the Strait of Hormuz area, horizontal and vertical distribution recorded. Increase in salinity and density from northeast towards northwest and from surface to depth. Electrical conductivity depends on temperature in summer but in winter depend on salinity. Dissolved oxygen was higher in the layer of 5-20m and decrease with increasing depth. Maximum chlorophyll-a was recorded in layers of 10-30m and 5-20m in summer and winter respectively. The density of nutrients increase from surface to depth but decrease from northeast towards northwest and density of nutrients in winter was higher than summer show write how much. Plankton population in this study characterized by 4 phylum and 5 classes of phytoplankton, 6 phylum and 8 classes of zooplankton and 23 family of Ichthyoplankton. Total 63 spices of phytoplankton belonging to 43 Bacillariophyceae, 14 Dinophyceae, 4 Cyanophycea, one Chrysophycea and one Euglenaphycea. Bacillariophyceae inparticular show very high density in winter 83 and Euglenaphycea is dominant group only in winter. Crustaceans were the most dominant group of zooplankton. Calanoids and Cyclopoids were abundant at all stations. Zooplankton were increase from East to West. Among Ichthyplankton, Clupeeiidae family the most abundant, the Gobiidae was in second position and followed by Engrauliide with high density than other family. All together 124 genera belong to 132 families of macro-benthos were identified. As they consist of 59 genera belong to 49 families of Polychaete, 27 genera belong to 44 families of gastropod, 23 genera belong to 27 families of Bivalve, 15 genera belong to 10 families and 2 order of Crustacean and 2 families of Scaphopoda. Additionally some groups of Echiurida, Sipunculida , platyhelminenthes, Echinodermata, Foraminiferans, Cnideriars,Chordata, Cheatognatha and Lophophora were identified. The most dominant groups were Crustacean and Polychaetes in percentage of abundance proportion of studies in last years .The mean biomass of macrobenthos has been decreased to 4.7 g/m. Note: Some species of macro-benthos identified up to family
    Keywords: Ecology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 6
    Publication Date: 2018-08-06
    Description: The indian white prawn (Penaeus indicus), as one of the commercially important and dominant species along the East coast of Hormozgan province, is a very potential and prospective candidate species for shrimp farming. Since, there wasn't well enough information about biology of this species from Iranian wateres, therefore. some biological aspects such as growth rate, reproduction behaviour distribution pattern and feeding habits were studied from March 1997 to March 1998. Monthly sampling were carried out from the fishing grounds and estuaries of Jask area in the Oman Sea by small trawlers and beach seines gears. Initial growth 01 male was faster than female, with calculated K=l.5 for male and K=1.3 for female. Isometric growth trend was observed in both sexes. Sexual maturity attained within the first 12 months. Spawners were occured abundantly during post-winter, spring and beginning of summer. Postlarvae and sub-adults were found in the esturies with 25-100 mm length, and high densities were observed around the mangrove's roots. They spend at least 3 to 5 months of their life span in the esturies. Analysis of stomach contents revealed that this species is an omnivore with indicative contents of detritus, polychaetes, crustaceane, bivalves, algae and sand particles, with preponderance of vegetable constituents in the sub-adults and of detritus in adults.
    Keywords: Biology
    Repository Name: Aquatic Commons
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  • 7
    Publication Date: 2018-09-05
    Description: Investigation on small pelagic fishes in the north of the Persian Gulf (Qeshm Island and Bandar Lengeh) coastal waters during October 2006 to September 2008, illustrated that 6 sardine and 2 anchovy species were locally existed. Sind sardinella (Sardinella sindensis) and Buccaneer anchovy (Encrasicholina punctifer) were dominated in this area. The peak of sexual maturity for Sind sardinella and Buccaneer anchovy occurred in spring and summer respectively. Reproduction period for Sind sardinella was from the middle of winter to late spring, and Buccaneer anchovy encompassed reproduction capacity all the year. The female: male ratio was calculated 1:0.7 and 1:0.9 for Sind sardinella, 1:1.27 and 1:1 for Buccaneer anchovy in Qeshm Island and Bandar lengeh sequentially. The mean of absolute fecundity were estimated 16234 and 16168 for Sind sardinella, 1277 and 1141 for Buccaneer anchovy in Qeshm Island and Bandar Lengeh respectively. L_M50 and L_C50 were calculated and the results showed both species mainly caught before length of maturity, and the mass populations have not sufficient opportunity to reproduction. Both species were planktonivore, theirs food prefect mainly consisted of copepods, naplius and bivalves. Vacuity index indicated both spices were semi-voracious appetite fishes. Based on calculated length-weight relationships in S. sindensis and E. punctifer, they have isometric growth. Growth parameters were estimated, the results illustrated that they were growth fast and short live species, which suggested S. sardinella and E. punctifer have 3 and 2 years maximum life span respectively. The recruitment pattern indicated double recruitment peaks per year in both species. Annually, four cohorts were distinguished in Sind sardinella and 3 cohorts in Buccaneer anchovy. Total mortality (Z), natural mortality (M) and fishing mortality (F) were estimated in both species, and the values of exploitation ratio (0.78 & 0.74) in Sind sardinella and (0.72 & 0.41) in Buccaneer anchovy were reasonable for current fishing effort due their short life span. Analysis of the results showed that CPUE in sardine and anchovy affected by reproduction and feeding processes. Results showed significant correlation between sardine CPUE and Sardine GaSI (P〈0.05, r= 0.499), similarly between anchovy CPUE and anchovy GSI (P〈0.05, r=-0.635). Further, significant correlation between sea surface temperature with sardine CPUE (P〈0.05, r=0.493), phytoplankton distribution (P〈0.01, r=0.560), anchovy GSI (P〈0.05, r=0.526), anchovy GaSI (P〈0.05, r=-0.500) and chlorophyll a (P〈0.01, r=0.780). Phytoplankton distribution with sardine GSI (P〈0.05, r=0.453), zooplankton distribution with anchovy GSI (P〈0.05, r=0.671), and chlorophyll with sardine GSI (P〈0.01, r=0.761) have significant correlation.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 8
    Publication Date: 2018-10-13
    Description: This project prepared and implemented during 2013-16 with emphasis on to provide the results of the fish larva projects (identification, abundance and distribution) in the Iranian waters of the Persian Gulf and Gulf of Oman which as well as had already been done by Iranian Fisheries Science Research Institute and affiliated research institutes and centers . Since each marine fish stocks management requires increased knowledge of the life cycle and be complete biological information, obviously implementation and increased field research is essential, on the other hand the results and the availability of data and information to operation and coordination with the scientific community at national and international levels is of particular importance. This is on condition that currently, due to the increasing trend researchers and students Aquatic Sciences and Fisheries, the availability of data resulting from studies and research projects and initiatives will be necessary. The site is currently only in view of identification and distribution of marine fish larva has been prepared in Farsi with photo gallery, and English language development and preparation of the site for the international operation there. It is worth mentioning in the same areas and the same site adjacent seas of fish larvae has not been prepared and is not available. So this site can also be considered as reference area. This site is available for researchers, scientist and students as address: http://ifl.ifro.ir/
    Keywords: Biology ; Information Management
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 9
    Publication Date: 2018-09-23
    Description: The survey of fish larva in Iranian water has done from 1995 till 2007. The aims of this study were included of identification, abundance, diversity index and distribution of fish larva in Iranian coastal waters of the Persian Gulf. In all research, sampling was done by Bongo net in day time. Totally 119006 specimen was collected and identified in 54 fish larva family from 90 stations. Gobiidae, Engraulididae ، Leiognathidae، Sparidae، Sillaginidae، Clupeidae, Cynoglossidae، Sciaenidae were the dominate families with higher abundance. 83342 specimen was collected from Khuzestan waters (higher than others) in 27 family, 26797 specimen in 52 fish larva family in Bushehr waters. The result of GIS map was shown; Clupeidae with three subfamily distributed in all Iranian waters with more abundance in summer and autumn, Sillaginidae was percent in all study area with more abundance in Bushehr waters, Gobiidae was in estuary habitat with higher abundance in Khuzestan waters in warm period, Sparidae distributed in the Persian gulf in more month of year, Engraulididae was collected from area with more abundance from Hormozgan with two spawning peaks; spring and autumn. Cynoglossidae with higher abundance from Khuzestan waters, Leiognathidae in Khuzestan waters was in warm period and in others site in all month. Sciaenidae was in Hormozgan more than others area. Mosa Creek-Estuary in Khuzestan with homogeny habitat was attractive the family related to the shore and muddy kind family, such as: Gobiidae, Leiognathidae whereas Bushehr waters with variety of habitat; Creek-Estuary, mangrove forest, rocky coral, coral path was attractive more family with different groups such as: lutjanidae ، Cepolidae ، Apogonidae، Lethrinidae and Atherinidae that some case only recorded from Bushehr in Persian gulf. Coastal waters of Bushehr province habitat was affected of sea waves and current therefore the abundance of family lower than Khuzestan waters except in some deeper stations. Finally there are different occasions influencing on fish larvae percent, abundance and distribution of them that are include: abiotic factors (temperature, salinity, depth and clarity), habitat, adult spawning behavior, morphologic characters of coastal area, In addition, from the type and geomorphologic structure of marine – coastal area, the difference between abundance and diversity of ichthyoplankton in two main coasts group as name wave dominant (open coasts) and tide dominant 9semi closed coasts) have harmony with together and are clear.
    Keywords: Aquaculture
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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