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  • Feeding  (8)
  • 2020-2022  (8)
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  • 1
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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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  • 2
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    Age determination and feeding habits of Nemipterus japonicus (Bloch, 1791) in the northern Oman Sea (2021)
    In:  http://aquaticcommons.org/id/eprint/22595 | 18721 | 2018-04-27 07:34:45 | 22595 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-07
    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.
    Keywords: Biology ; Fisheries ; Nemipterus japonicus ; Feeding ; Age ; Otolith ; Oman Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 248-264
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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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    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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  • 5
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    Feeding biology of the japanese threadfin bream (Nemipterus japonicus) (2021)
    In:  http://aquaticcommons.org/id/eprint/24863 | 18721 | 2018-11-22 07:05:12 | 24863 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-15
    Description: In order to study the feeding biology of the Japanese Threadfin Bream in the Northern parts of Oman Sea (Chabahar Area), a total of 212 specimens were collected in 2009-2010, and different indices of VI, FP and GSI were taken into consideration. Of total stomachs, 51, 44 and 117 numbers were full, semi-full and empty, respectively. The VI index was estimated 55.2%, and amount of Food Preference Index were estimated as: Crustacean (63.2%), Fishes (38.9%), Molluscs (36.8%), Nematoda (25.3%), Polychaeta (8.4%), Sipuncula (7.4%), Foraminifera (6.3%), Phytoplanktons (4.2%), Seeweeds (2.1%) and Nemertean worms (1.1%). The maximum and minimum Gastro-Somatic Index for males was in autumn and winter season; and for females in summer and spring. It was concluded that N.japonicus is a moderate feeding fish and its main food is Crustacean and minor foods are Molluscs and Fishes.
    Keywords: Aquaculture ; Biology ; Fisheries ; Japanese threadfin bream ; Nemipterus japonicus ; Indices of feeding ; Feeding ; Seeweed ; Nematoda ; Polychaeta ; Sipuncula ; Foraminifera ; Phytoplanktons ; Oman Sea ; Chabahar Area ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 12-22
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  • 6
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    Feeding biology of the Japanese threadfin bream (Nemipterus japonicus) (2021)
    In:  http://aquaticcommons.org/id/eprint/26019 | 18721 | 2018-11-22 07:24:56 | 26019 | Khorramshahr University of Marine Science and Technology
    Details
    Publication Date: 2021-07-24
    Description: In order to study the feeding biology of the Japanese Threadfin Bream in the Northern parts of Oman Sea (Chabahar Area), a total of 212 specimens were collected in 2009-2010, and different indices of VI, FP and GSI were taken into consideration. Of total stomachs, 51, 44 and 117 numbers were full, semi-full and empty, respectively. The VI index was estimated 55.2%, and amount of Food Preference Index were estimated as: Crustacean (63.2%), Fishes (38.9%), Molluscs (36.8%), Nematoda (25.3%), Polychaeta (8.4%), Sipuncula (7.4%), Foraminifera (6.3%), Phytoplanktons (4.2%), Seeweeds (2.1%) and Nemertean worms (1.1%). The maximum and minimum Gastro-Somatic Index for males was in autumn and winter season; and for females in summer and spring. It was concluded that N.japonicus is a moderate feeding fish and its main food is Crustacean and minor foods are Molluscs and Fishes.
    Keywords: Biology ; Iran ; Oman Sea ; Chabahar Area ; Japanese threadfin bream ; Nemipterus japonicus ; Indices of feeding ; Feeding ; Seeweed ; Crustacean ; Nematoda ; Polychaeta ; Sipuncula ; Foraminifera ; Phytoplanktons
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 12-22
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  • 7
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    Feeding behaviour of blue swimmer crab (Potunus pelagicus) in Hormuzgan province waters (2021)
    In:  http://aquaticcommons.org/id/eprint/24847 | 18721 | 2018-07-16 10:01:09 | 24847 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: This research was carried out to study the feeding behaviour of blue swimmer crab (Portunus pelagicus) in Hormuzgan province waters from October 2001 to December 2002. Samplings were done in different methods by presence on research vessels, fishing vessels and dhows in addition to collect the samples from stake-nets. 490 stomach contents were observed under stereomicroscope in which among them the numbers of full, semi-full and empty stomachs were 136,197 and 157, respectively. The food contents were classified into 4 main groups namely; fish, mollusc, crustacean and plankton. The Index of C.V. was estimated 32.04. This figure shows that blue swimmer crab can be assumed as a gluttonous species.
    Keywords: Biology ; Fisheries ; Feeding ; Potunus Pelagicus ; Blue Swimmer Crab ; Persian Gulf ; Hormuzgan province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 143-150
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  • 8
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    A survey on black mouth Croaker (Atrobucca nibe) resources in the north-west of Oman Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25531 | 18721 | 2018-10-05 15:27:32 | 25531 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Blackmouth croackers (Atrobucca nibe) resources are the most important commercial stocks in the north-west of Oman Sea, exploited as lantern fisheries by catch with trawlers vessel. At least 50 specimens were sampled monthly from September 2012 to July 2014. Results showed blackmouth croacker have several small peak in gonado-somatic index, but the most frequency of adults occurred in May. The female: male ratio was calculated 1:0.8 and the LM_50 was estimated at 35 cm. The mean of absolute and relative fecundity were estimated 92988 and 223 respectively. LM_50 and LC_50 were calculated and the results showed this species mainly caught before length of maturity, and the mass populations have not sufficient opportunity to reproduction. The mean of egg diameter for black mouth croaker were calculated at 533±103. Linear model of Fecundity= 9597.6TL-233880 was calculated for length-fecundity relationship . Results of feeding showed lantern fishes (65%), shrimps (11%), Japanese threadfin bream (13%) and the other fishes (11%) were the main feeding regime of black mouth croaker. This species was carnivore, the food prefect mainly consisted of lantern fishes (57.7%) and shrimps (28.2%). The vacuity index (87.7 %) indicated this spices was low appetite fish. Total length range was 18 to 47.5 cm with mean length of 28.7 cm, and the class of 23-24 cm was the most frequent length in fishing ground. The length-weight relationships in A. nibe were calculated for female and male W= 0.0121L2.9385 and W= 0.0075L3.0737 respectively, both have isometric growth. Growth parameters of L_∞ and K were estimated 50 cm and 0.2 y^-1 respectively. Parameters of t0, Tmax and Ǿ were calculated -0.7 year, 14 year and 2.69 respectively. This species have two recruitment period, and the peak of recruitment was occurred in May with 23.14 percent. Total mortality , natural mortality and fishing mortality rates were calculated 0.53 y^-1, 0.46 y^-1 and 0.07 y^-1 respectively. Due to the calculated exploitation rate (0.13), it is appreciated the improvement of black-mouth croaker in the Oman Sea. Base on seasonal and monthly CPUE it was resulted the peak of fishing density were occurred in the winter. Results showed the main distribution of black-mouth croaker concentrated on the continental slope in 200 m depth, but these stocks move to deeper waters (more than 200m) in warm season and extend to shallow waters (less than 200m) in winter.
    Keywords: Biology ; Fisheries ; Iran ; Oman Sea ; Atrobucca nibe ; Reproduction ; Feeding ; Growth Parameters ; Mortality rates ; Exploitation rate ; Distribution ; Survey ; Black mouth Croaker
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 87
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