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  • Biology  (47)
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  • 1
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    The first record of bobtail squid, Euprymna hyllebergi Nateewathana, 1997 (Cephalopoda:Sepiolidae) from the Persian Gulf, Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: The family Sepiolidae comprises over 50 species in 14 genera. They are commonly known as bobtail squids with a worldwide distribution from tropical to temperate and sub-polar latitudes of all oceans (Nateewathana, 1997; Aungtonya et al., 2011). Euprymna hyllebergi belongs to the Sepiolidae family and Sepiolinae subfamily. This species has a wide distribution in the Eastern Indian Ocean, and has been recorded up to the depth of 47 meters in Andaman Sea, Thailand (Jereb and Roper, 2005). The family Sepiolidae, includes all bobtail squids with kidney-shape fins little is known about their biology, but they are common in tropical, temperate and sub polar waters of all oceans (Jereb and Roper, 2010). This is the first record of the bobtail squid, E. hyllebergi from the Persian Gulf. On 27th of March 2013 during a Scuba diving session in Persian Gulf (Figure 1, coordinates: 54° 49’39.5”E, 26° 26’ 55.3”N) about 200 eggs of E.hyllebergi were collected at the depth of 40 meters in northern Persian Gulf. The eggs (Fig. 2a) were transferred to the Persian Gulf Shellfishes Research Center laboratory for further incubation and hatching.
    Description: Published
    Keywords: Biology ; Physiology ; Bobtail squid ; Euprymna hyllebergi
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1082-1085
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  • 2
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    Age determination and feeding habits of Nemipterus japonicus (Bloch, 1791) in the northern Oman Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: Age determination and feeding habits of the Japanese threadfin bream, Nemipterus japonicus, was carried out in the northern Oman Sea (Chabahar area), based on 212 specimens collected between September 2009 and May 2010. The minimum and maximum fork length and body weight were measured as 145, 258 mm and 55.31, 288.12 g. The relationship between Body Weight (BW) and Fork Length (FL) for all individuals was estimated as BW= 0.0001×FL2.83 (r2 = 0.9425, n= 212). The Vacuity Index (VI) was 55.2% that shows N. japonicus is a moderate feeder. The maximum and minimum Gastro-Somatic Index for males was in autumn and winter seasons and for females were in summer and spring. The Food Preference Indices were estimated as: crustacean (63.2%) as main food fishes (38.9%) and molluscs (36.8%) as minor food. Age determination was done by otolith sectioning. A total of 135 sagitta were sectioned. The maximum age was 5+ years old for a female with FL= 256 mm and the youngest one was 1 year old for a female with FL= 145 mm. Based on obtained results there is a significant relationship between feeding and age namely with increase of age, the feeding rate is decreased without any changes in type of feeding and food contents.
    Description: Published
    Keywords: Nemipterus japonicus ; Feeding ; Age ; Otolith ; Biology ; Physiology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.248-264
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  • 3
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    Age determination and morphological study using otoliths in Cyprinus carpio Linnaeus, 1758 in the Southern Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: The relationships between sagitta otolith morphology and fish size were examined for common carp in the Southern Caspian Sea and also the aging of different length groups were determined. Statistical tests to examine correlation between left and right otoliths dimensions were carried out and no statistically significant difference between them was found. The biggest otolith had 0.032g weight belongs to an individual with BW= 428g and FL=36cm and the smallest otolith had 0.014g for a fish with BW=220g and FL= 26cm. Regression model relations to each otolith morphometric parameter to fish length are provided. Also, the aging of this species was done by sectioning of sagitta otolith and a high significant correlations was found between fish age and morphometric parameters of both body weight and fork length and also otolith weight and length. The maximum age was determined 6+ years. The length-weight relationship was BW= 0.006 TL3.232 (r = 0.963). According to the morphometric relationships obtained, it was concluded that otolith length and weight are good indicators of fish body weight and fork length.
    Description: Published
    Keywords: Biology ; Physiology ; Sagitta otolith ; Cyprinus carpio ; Age ; Morphological ; Length ; Weight
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.759-769
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  • 4
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    Morphological characteristics of lapillus and aging of Plicofollis dussumieri (Ruppell, 1837) from Oman Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: In this paper age determination and morphological characteristics of blacktip catfish, Plicofollis dussumieri, from Oman Sea were evaluated. A total of 132 fish specimens were collected from fishing trawlers or landings from March 2011 to July 2012, with minimum and maximum of 245 mm, 195 g and 767 mm, 5801 g, respectively. Maximum life span was 12 years for the length range of 245 – 767 mm FL, while total body weight (BW) ranged between 195 and 5801 g and the resultant equation was: W = 0.040 L2.8275 (R2 = 0.99). High correlation coefficient value found between age and FL was R= 0.97 and for age-BW was 0.94. This value for otolith weight and BW was estimated to be 0.91 and showing that there were significant correlations between measured parameters. Lapillus otolith in blacktip catfish is the biggest otolith among most teleostei fishes, also the Sagitta is the biggest. Lapillus of this species is round, robust, onion-like and without sulcus curve, with no obvious growth increments in rostrum and antirostrum zones. In ventral side Gibbus maculae is concave having prominentia marginalis in anterior and basal line in posterior parts.
    Description: Published
    Keywords: Biology ; Physiology ; Plicofollis dussumieri ; Catfish ; Blacktip catfish ; Morphology ; Age ; Otolith ; Lapillus
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.494-502
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  • 5
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    A survey of some biological aspects of Cobia (Rachycentron canadum) (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    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 (r2= 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 ( r2=0.9852). Thetotal length-fork length relationship was TL= 1.1561FL-2.533 (r2= 0.9933). Growth parameters K, L ,and t0 were calculated by von bertalanfy growth equation : 0.11 (year1), 168.65 cm, 3.49 and -0.97 respectively. The instaneous 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 yearrespectively.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Rachycentron canadum ; Cobia ; Sex ratio ; Fecundity ; Lm50 ; Feeding ; Mortality ; Growth ; Parameters ; Biology ; Maturity ; Spawning ; Fecundity
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 85pp.
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  • 6
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    Age determination and morphology of otolith in Alburnus chalcoides (Guldenstaedt, 1772) in the southern Caspian Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/21742 | 18721 | 2017-11-30 03:27:22 | 21742 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-30
    Description: The aim of this study was to provide necessary information on the age, growth and sex ratio of one of commercially important cyprinid species, Alburnus chalcoides in the southern Caspian Sea (North of Iran) from 2010 through 2011. 53 specimens of both sexes (males and females) were collected monthly. The samples were transported to the laboratory for further biological measurements and otolith extraction. The maximum and minimum age of A. chalcoides was 4+(FL=26.0 cm) and 1+ (FL= 18.1 cm), respectively. The mean fork length of A. chalcoides was 20.21±0.287 cm; and the sex ratio was 1.00: 2.12. The calculated length-weight relationships for all individuals were as W=0.141TL2.199 (R2= 0.648). Different regressions were prepared between age and morphological measurements of fish and otolith, of which the highest correlation was between age and body length as a linear regression of TL=1.959Age+16.32 (r= 0.66). There was no significant correlation between morphometric measurements of otolith and fish morphological parameters (p〉 0.05), and an allometric growth was found with a slope of b=1.926 for the study area.
    Keywords: Biology ; Fisheries ; age ; determination ; morphology ; otolith ; Alburnus chalcoides ; Caspian Sea ; Iran ; sex ; growth ; morphometric
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 205-214
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  • 7
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    Evaluation of feeding indices of catfish Arius dussumieri in Oman Sea (Sistine & Baluchistan) (2021)
    In:  http://aquaticcommons.org/id/eprint/21961 | 18721 | 2018-01-18 10:12:01 | 21961 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: Due to study the food regime of Arius dussumieri, a total of 132 specimens were collected from Oman sea waters, Sistine & Baluchistan province. The stomach content, were taken into consideration and it was found that the amount of full, semi-full and empty stomachs were 31, 33 and 36 percent, respectively; of which the highest frequency was in winter (74%) and the lowest was in summer (24%). On the other hand, the fullness index was studied with the highest and lowest value for spring (44%) and winter (5%), respectively. The GaSI shows that A. dussumieri, has better feeding in spring and summer but feeding (up in male) was decreased in autumn and winter. The Food Preference (FP) Index was estimated as: Fishes (39%), Crustacean (40%) and Molluscs (20%) namely all of them are considered as minor food in all four seasons. The most important food items were identification as fishes: Carangidae, Engraulidae & Leiognathidae; crabs: Portunidae & Porcellanidae; shrimp: Alpheidae; cephalopods: Loliginidae & Opisthoteuthidae; gastropods: Muricidae & Naticidae.
    Keywords: Biology ; Fisheries ; Benthic ; fih ; Food item ; Iran ; Oman Sea ; Evaluation ; feeding ; catfish ; Arius dussumieri ; Sistine ; Baluchistan ; Carangidae ; Engraulidae ; Leiognathidae ; Portunidae ; Porcellanidae ; Alpheidae ; cephalopods ; Loliginidae ; Opisthoteuthidae ; gastropods ; Muricidae ; Naticidae
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 31-40
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  • 8
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    Distribution and estimation of washed out seaweeds biomass in Oman Sea coastal waters (2021)
    In:  http://aquaticcommons.org/id/eprint/22132 | 18721 | 2018-07-01 22:28:46 | 22132 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-06-27
    Description: This study was carried out to determine the seaweed biomass in the coast of Sistan & Baluchestan Province. Beris, Chabahar, Pozm and Tang were introduced as high density zones and Jood & Lipar were selected as low density zones. Among 354.2 km of investigated coastal area, 18.2 km were high density zone and 281.5 km were low density zone. Three transects were fixed in study areas and sampling randomly was done monthly. The samples were measured in area after being cleaned, and separating. During this research, 9 genus were collected. Among these seaweeds, 2 genus were green algae (composed of 2 families and 2 orders), 6 genera of brown algae (composed of 3 families and 3 orders) and 1 genus of red algae. Wet biomass of Sargassum genus in the total area of Sistan & Baluchestan coasts was 445.9 tons in 2012. Among this biomass, 269.1 tons (60.35%) was found in high density area and 176.8 tons (39.65%) in low density zone. The maximum biomass, 270.4 tons (high density zone: 155.5 and low density zone: 114.9 tons) was obtained in December, and the lowest biomass, 3.5 tons was obtained in March.
    Keywords: Biology ; Ecology ; Seaweeds ; Density ; Biomass ; Oman sea ; Iran ; Distribution ; Sistan ; Baluchestan ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 51-61
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  • 9
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    Morphological characteristics of lapillus and aging of Plicofollis dussumieri (Ruppell, 1837) from Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22792 | 18721 | 2018-05-22 19:40:40 | 22792 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: In this paper age determination and morphological characteristics of blacktip catfish, Plicofollis dussumieri, from Oman Sea were evaluated. A total of 132 fish specimens were collected from fishing trawlers or landings from March 2011 to July 2012, with minimum and maximum of 245 mm, 195 g; and 767 mm, 5801 g, respectively. Maximum life span was 12 years for the length range of 245 – 767 mm FL, while total body weight (BW) ranged between 195 and 5801 g and the resultant equation was: W = 0.040 L^2.8275 (R^2 = 0.99). High correlation coefficient value found between age and FL was R= 0.97 and for age-BW was 0.94. This value for otolith weight and BW was estimated to be 0.91 and showing that there were significant correlations between measured parameters. Lapillus otolith in blacktip catfish is the biggest otolith among most teleostei fishes, also the Sagitta is the biggest. Lapillus of this species is round, robust, onion-like and without sulcus curve, with no obvious growth increments in rostrum and antirostrum zones. In ventral side Gibbus maculae is concave having prominentia marginalis in anterior and basal line in posterior parts.
    Keywords: Biology ; Fisheries ; Blacktip catfish ; Morphology ; Age ; Otolith ; Oman Sea ; Biology ; Physiology ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 494-502
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  • 10
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    Evaluation of some feeding indices of Pomadasys kaakan in the northern Persian Gulf (2021)
    In:  http://aquaticcommons.org/id/eprint/22441 | 18721 | 2018-04-09 19:29:38 | 22441 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: In this paper the Vacuity Index (VI), Fullness Index (FI) and Food Preference Index (FPI) for the stomach contents of Pomadasys kaakan were evaluated to assess the quantity and kind of food which this fish consumes in the Persian Gulf. A total of 227 specimens were collected from fishing trawlers or landings from November 2005 to September 2006. 24.7% of stomachs were full, 11.9% were semi-full and 63.4% were empty. The seasonal average of VI was 77.4, 44.6, 80.0 and 54.0 % for autumn, winter, spring and summer, respectively. The overall FI was 36.6 with seasonal averages of 22.6, 55.4, 20.0 and 46.0 in autumn, winter, spring and summer, respectively. The main stomach contents were crustaceans (esp. crab & shrimp), fish, mollusks (bivalves, gastropods and cuttlefish), stomatopoda, brittle stars, Lingula sp. and sea weeds. The estimated FPIs for crustaceans were 77.7, fish 32.1, mollusks 28.6 and echinoderms 18.8 %. Overall, the results show that this fish is a relatively frugal species which consumes crustaceans as main food and has adopted itself with ecological changes of the Persian Gulf.
    Keywords: Biology ; Ecology ; Fisheries ; Pomadasys kaakan ; Feeding ; Food Preference ; Vacuity and Fullness Indices ; Persian Gulf ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 497-504
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