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  • Persian Gulf  (23)
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  • 1
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    Population dynamic parameters of Thunnus tonggol (Bleeker, 1851) in the Persian Gulf and Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22652 | 18721 | 2018-05-09 19:51:03 | 22652 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-08
    Description: Length frequency data of the longtail tuna, Thunnus tonggol collected from October 2006 to September 2007 were analyzed for evaluation of the stock parameters. T. tonggol is mainly caught by gillnet method. Yearly tuna and tuna-like catches in Iran are of the order of 174,234 mt, close to 46% of which are longtail tuna. The VBG parameters for longtail tuna were: L∞ =133.72cm K=0.35 year^−1.The length-weight relationship was estimated as: W=0.00002 L^2.83. The instantaneous rates of total mortality (Z) was estimated by using the Powell-Wetherall plot as 1.82 year^−1. The instantaneous rate of natural mortality was obtained by Pauly equation (M=0.44 year^−1) and the instantaneous rate of fishing mortality (F) estimated from Z-M=1.38 year^−1.
    Description: Article includes abstract in Farsi on last page.
    Keywords: Biology ; Fisheries ; Growth and mortality parameters ; Thunnus tonggol ; Persian Gulf ; Oman Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 855-863
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  • 2
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    Population dynamics of Sind Sardine, Sardinella sindensis, in coastal waters of Qeshm Island (2021)
    In:  http://aquaticcommons.org/id/eprint/23733 | 18721 | 2018-07-21 03:52:57 | 23733 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Sardinella sindensis is economically the most important small pelagic fish species in the coastal area of Qeshm Island. Population dynamics of Sind sardinella from Qeshm Island coastal waters, during April 2005 to March 2006 were studied. The asymptotic length (Lx) and growth coefficient (K) were estimated at 178mm and 1.11yr ^(-1), respectively. The minimum and maximum T.L was recorded at 42 and 172mm respectively. The value of t0 was calculated at -0.17, and Tmax was estimated at 2.7 year. The Von Bertalanffy growth equation was obtained at L_(t) = 178^(1-exp(-1.1 l(t-(-0.17))) for this species. Total mortality (Z) rate was estimated to be 3.48yr ^(-1) (r ^(2) = 0.88) on length-converted catch curve method. The rates of natural mortality (M) based on Pauly's empirical equation, fishing mortality (F) and exploitation ratio were estimated at 1.13yr ^(-1), 2.35yr ^(-1) and 0.67, respectively. Four cohorts were distinguished annually based on Bhattacharya's method with mean length of 56, 89, 107 and 141mm. Maximum recruitment was in September at 18.62 percent. The length-weight relationship was determined as W= 0.000005 L ^(3.1399).
    Keywords: Biology ; Fisheries ; Length-weight relationships ; Mortality ; Growth ; Population dynamics ; Marine ; Pelagic fisheries ; Sind sardinella ; Sardinella sindensis ; Persian Gulf ISW ; Qeshm Island ; Persian Gulf ; ISW ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 77-86
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  • 3
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    A survey of some biological aspects of cobia (Rachycentron canadum) (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25125 | 18721 | 2018-08-26 13:28:59 | 25125 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Biology aspects of cobia (Rachycentron canadum) were investigated from October 2005 to December 2006 in Northern waters of Persian Gulf (Hormozgan province).The reproduction cycle, sexual maturity, sex ratio, Fecundity, Lm50, feeding, length frequency, growth parameters and mortality of cobia were studied from total of 509 specimens ranged from 19 to 159 fork length. Gonadosomatic index peaked during spring and summer with main peak in June. Spontaneous spawning occurs around the year with peak in June. The overall female to male ratio was significantly 1 : 1.49 (P〈0.05). Batch fecundity were estimated 1684954±118990 in 15 females. Relationship between total length and fecundity were calculated F=1.3717TL 2.9567 (r^2= 0.82). Feeding studies indicated that the bony fishes were main food of cobia (76%) and followed by crustaceans (25%) and mollusks (11%). Rays were least food items (22%). Maximum and Minimum GaSI were observed in March (33%) and August (0.07%) respectively. Females reached 50% sexual maturity at 81.25 cm TL. The total length -weight relationship was W=0.0042L3.1162 (r^2=0.9852). Thetotal length-fork length relationship was TL= 1.1561FL-2.533 (r^2= 0.9933). Growth parameters K, L, and t_0 were calculated by von bertalanfy growth equation: 0.11 (year1), 168.65 cm, 3.49 and -0.97 respectively. The instantons rate of total mortality (z), natural mortality (M) and fishing mortality estimated by catch curve analysis were 0.30, 0.25, 0.14 (year1). Exploitation rate and Tmax were 0.36 and 28 year respectively.
    Keywords: Biology ; Iran ; Persian Gulf ; Hormozgan province ; Rachycentron canadum ; Cobia ; Sex ratio ; Fecundity ; Lm50 ; Feeding ; Mortality ; Growth ; Parameters ; Biology ; Maturity ; Spawning ; Fecundity
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 85
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  • 4
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    Biomass estimation of demersal resources in the Persian Gulf and Oman Sea by swept area method (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25383 | 18721 | 2018-09-14 07:42:31 | 25383 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Regarding to monitor of demersal resources in the Persian Gulf and Oman Sea, and also biomass and CPUA estimation of them, eleven research cruises were carried out by using R/V Ferdows-1 equipped with bottom trawl, covering the area from 49º 00´ E in the west (borderline with Kuwait) to 61º 25´E in the east (borderline with Pakistan) from 2009 to 2011. The study area was stratified into 17 strata (A to Q) of which 10 strata (A to J) were in the Persian Gulf and 7 strata (K to Q) were in the Oman Sea, covering the depths of 10-50 m in the Persian Gulf and 10-100 m in the Oman Sea. A total of 316 stations were randomly selected and the biomass and CPUA were estimated by swept area method. In 2009, due to the bloom of jellyfish, there was some problem for sampling and therefore made some bias in our estimation. Therefore, the biomass of jellyfish was excluded from all calculations. The comparison between two regions indicated that the percentage of density of demersal fishes in the Persian Gulf during years 2009, 2010 and 2011 were 1.5, 3.7 and 1.7 times more than the Oman Sea and totally 60-80% of total biomass was found for the Persian Gulf. Also a comparison among 17 strata the highest biomass was found for K region (Sirik to Jask) in the Oman Sea in 2009 & 2011; and C & D regions (Genaveh to Dayyer) in 2010 in the Persian Gulf. The same comparison was done for CPUA of commercial, non-commercial and total in both water bodies and it was found that in years 2009 and 2011 the regions of L (Jask to Meidani) and K (Sirik to Jask) in the Oman ; and 2010 the G region (Mogham to Farour) in the Persian Gulf had the highest value of this parameter. It can be concluded that the north-west of the Oman Sea has the best condition of biomass and CPUA of commercial and non-commercial demersal fishes; and on the contrary the low values were estimated for A region (north-west of the Persian Gulf) and P region (Konarak to Ramin) in the Oman Sea. With review the mean CPUA in defferent depth layers for years 2009, 2010 and 2011, it was concluded that with increasing the depth, the mean CPUA is decreased and the lowest CPUA belongs to depths of 50-100 m. The comparison between commercial and non-commercial groups in both ecosystems, it concluded that the density of commercial species were higher than non-commercial ones; and for years 2009, 2010 and 2011 the commercial species consist of 52.2, 57.1 and 59.7 % of total biomass. In all years the Persian Gulf indicated higher values than the Oman Sea. The most abundant fishes were Rays, Catfishes, Grunts, Japanese threadfin bream, Carangids, Hair tail, Barracuda and Lizardfish for both Persian Gulf and Oman Sea.
    Keywords: Fisheries ; Iran ; Persian Gulf ; Oman Sea ; Sirik ; Jask ; Bandar Genaveh ; Commercial fishes ; Non-commercial fishes ; Biomass ; Catch per unit of area ; CPUA ; Sampling ; Density ; Species ; Catfishes ; Grunts ; Japanese threadfin bream ; Carangids ; Hair tail ; Barracuda ; Lizardfish
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 283
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  • 5
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    Biological survey on small pelagic fishes (sardine & anchovy) stocks in coastal waters of Hormuzgan province (Qeshm Island & Bandar Lengeh) with emphasis on sea surface temperature, plankton distribution and chlorophyll-a (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25198 | 18721 | 2018-09-05 16:25:43 | 25198 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    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 ; Iran ; Persian Gulf ; Qeshm Island ; Bandar Lengeh ; Sardinella sindensis ; Encrasicholina punctifer ; Reproduction ; Feeding ; Growth and mortality ; Catch per unit effort ; Sea surface temperature ; Chlorophyll a ; Sexual maturity ; Plankton ; Naplius ; CPUE ; GSI ; Sardine ; Anchovy ; Coastal waters ; Surface ; Temperature ; Distribution
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 134
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  • 6
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    Diversity of Coral Reef Fishes in Larak Island, Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/26160 | 18131 | 2019-01-24 08:43:32 | 26160 | Islamic Azad University, Bandar Abbas Branch
    Details
    Publication Date: 2021-07-24
    Description: The coral reefs are one of the most important and rich ecosystems in the world and are considered as major habitat for different species group of fishes. Fourteen islands are found in the northern Persian Gulf including Larak Island of which the coral regions around this island were determined and then for sampling, 6 stations were randomly selected by Manta Tow method in July to December 2010. The identification was conducted using Visual Census technique in 6 stations. A total of 54 species belong to 41 genera and 23 families were identified and amongst them the abundant species group belonged to Pomacentridae family with 11 species. The results indicated that however the stations were far from urban area; the species diversity has been higher.
    Keywords: Biology ; Conservation ; Ecology ; Fisheries ; Biodiversity ; Coral Reef fish ; Larak Island ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 85-92
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  • 7
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    A survey on plankto an investigation on ecology of mudskippers in Hormuzgan coastal areas communities in Bandar Abbas coastal area (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25836 | 18721 | 2018-10-13 10:31:51 | 25836 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    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 ; Iran ; Persian Gulf ; Hormozgan Province ; Mudskippers ; Ecology ; Periophthalmus waltoni ; Boleophthalmus dussumieri ; Scartelaos tenuis ; Female ; Male ; Benthic fauna
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 97
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  • 8
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    Spatial and temporal variations of phytoplankton population in coastal waters of Hormozgan province (Qeshm and Leangeh) (2021)
    In:  http://aquaticcommons.org/id/eprint/22170 | 18721 | 2018-02-21 17:15:07 | 22170 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-29
    Description: The relationship between diversity or density of phytoplankton and other marine fisheries sector is of great importance. The study of Spatial and temporal variability of distribution of phytoplankton communities in the coastal waters of the Northern Persian Gulf (QESHM, LENGEH) were studied during 2008. In this study, five groups (47 genera) of phytoplankton include, Bacillariophyceae, Dinophyceae, Cyanophyceae, Crysophyceae and Euglenophyceae were identified. The result showed that Diatoms group (79.6 %) and Rhizosolenia genus (45.5 %), contributed more towards the percentage composition of different groups and genera of phytoplankton at the during Study. The annual changes in relative abundance and Margalef, Shannon, pielu and Simpson indices were estimated, 0.58-2.56, 0.08-0.97, 0.23-2.6, 0.09-0.93 respectively. Multivariate analysis of variance showed that during the study, density and biological indicators of phytoplankton were significant between seasons (p〈0.05). The spatial cluster analysis based on similarity coefficients obtained two clusters in the areas studied. According to the results obtained can be concluded that both the area of ecological conditions in ranks are instead moderate. Also, phytoplankton of diversity and richness is good.
    Keywords: Biology ; Fisheries ; Phytoplankton ; Density ; Diversity ; Fishery ; Persian Gulf ; Iran ; Qeshm ; leangeh ; Hormozgan province
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 11-22
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  • 9
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    An investigation on aquatics diversity and density in marine artificial reef, Moloo area of Bandar-e-Lengeh, Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/23808 | 18721 | 2018-07-27 15:22:16 | 23808 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Over-fishing of marine resources has endangered many commercial fish species in the world. Setting up artificial reefs is now considered an important way for marine stocks and fishing enhancement. The present study was designed to monitor fish abundance and species changes around a small and newly established artificial reef system in Moloo area at Bandar- e-Lengeh during two years after installation in September 2005. The anificial reef includes three types of concrete structures arranged in a seven by three grid. Each cross point was considered as a sampling station and two other stations were also selected from two sides of the system as control points. The CPUE and frequency of fishes in transect 7 with a mixed structure showed significant differences with Other 6 transects (P〈0.01). No fish diversity differences were seen between transects (P〉0.01). Although there were differences CPUE averages of different seasons, the ANOVA test of difference significance was negative. The t-test showed no significant differences between the abundance and of different species per trap per day and seasons. The dominant species were Epinephelus coioides, Plectorhinchus shoran Diagrama pictum, Siganus javus.
    Keywords: Biology ; Ecology ; Artificial Reef ; Fish ; CPUE ; Hormuzgan province ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 129-138
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  • 10
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    Study of grain size and organic carbon of sediments for artificial reef installation in coastal waters of Hormuzgan Province (2021)
    In:  http://aquaticcommons.org/id/eprint/23867 | 18721 | 2018-08-01 05:23:52 | 23867 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: Central and western coastal waters of the Persian Gulf along Hormuzgan province were investigated for site selection of artificial reefs installation. The grain size and organic carbon content of sediments were studied seasonally in the year 2007. For sampling, we stratified the area between the south of Qeshm Island to Hendorabi Island to 10 transects, and partitioned each to 3 sub-transects (Coastal line to 10, 10-20 and 20-30m deep), using a random design. The maximum and minimum amount of silt were recorded in transects of Bandar Haseineh and Bandar Chiroyeah (45.39% and 38.79%), for sand transects of Bandar Masen and Bandar Haseineh showed the maximum and minimum (63.95% and 38.79%) and for clay transects of Bahman Jetty and Bandar Masen (23.47% and 9.02%) were recorded and the highest and lowest respectively. Also, the maximum and minimum amount of carbon organic content was determined in Bandar Kong transect (1.62%) and Hengum Island transect (0.63%), respectively. The results of one-way analysis of variance showed a significant difference in organic carbon content of sediments from transects of Hengum Island, Bandar Masen and Bandar Gourzeh in comparison with other transects (P〈0.05), (95% confidence interval). However, the difference was not significant for grain size and organic carbon of bottom sediments in all stations (P〉0.05). Also, we found a significant correlation between silt (r 0.52), sand (r = -0.63) and clay (r = 0.67) with organic carbon (P〈0.0I). Finally, the best transects for artificial reefs installation were defined based on bottom hardness (Hengum Island, Bandar Masen, Bandar Selakh and Bandar Chiroyeah), productivity (Hengum Island, Bandar Masen, Bandar Selakh, Bandar Bostaneh, Bandar Haseineh, Bandar Charak and Bandar Gourzeh) and organic carbon (Bahman Jetty, Bandar Selakh, Bandar Kong, Bandar Bostaneh, Bandar Haseineh and Bandar Charak).
    Keywords: Ecology ; Artificial Reef ; Ecosystem ; Costal waters ; Hormozgan province ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 21-28
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