Growth, Mortality and Yield-Per-Recruit of the Rabbit Fish, Siganus Rjvula Tus, From the Eastern Side of the Gulf of Suez, Sinai Coast, Red Sea

El-Ganainy, Azza A.; Ahmed, Ashraf

doi:10.21608/ejabf.2002.1728

Cited by 9 publications

(9 citation statements)

References 13 publications

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“…Nonetheless, it is lower than that estimated by Mehanna and Abdallah [39] in the Egyptian sector of the Red Sea (Z=1.270 year-1 ), and El-Ganainy and Ahmed in the eastern side of Suez Gulf (Z=3.15 year-1 ). On the other hand, the natural and fishing mortalities (M=0.2214 and F=0.6626 year-1 ) in the present study are lower than that obtained by El-Ganainy and Ahmed [15] in the eastern side of Suez Gulf (M=1.43 and F=1.72) and nearly equal to that reported by Mehanna and Abdallah [39] (M=0.26 and F=1.01 year-1 ). Concerning mortality estimates, comparison is so difficult due to shortage of data and the total mortality coefficient is not a species-specific parameter, but an area specific parameter.…”

Section: Discussioncontrasting

confidence: 63%

“…The first species is dominant in the Egyptian waters of Mediterranean, in the coastal area off Alexandria [11] especially in Abu-Qir Bay [12]. Information about Siganus rivulatus age and pertinent growth rate were studied in both the Red Sea [9][10][11][12][13][14][15] and in the Mediterranean [16][17][18][19]. An existing data mainly concern the reproductive biology and rearing experiments [20][21][22][23][24] have been reported.…”

Section: Introductionmentioning

confidence: 99%

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On the Biology of Siganus rivulatus Inhabits Bitter Lakes in Egypt

El-Drawany¹

2015

J Aquac Res Development

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The present work was carried out to study the age, growth, length-weight relationships, spawning season, length at first sexual maturity and mortality of the commercial Rabbit fish, Siganus rivulatus, inhabits Bitter Lakes in Egypt. Fish samples which were collected during the period from January to December 2011 were selected to represent all fish size categories in the catch. Each fish specimen was measured, weighted and then dissected to detect the maturity stage of the gonads. The annual rates of total, natural and fishing mortality were calculated as 0.8840, 0.2214 and 0.6626 yr-1 respectively. Current exploitation rate 'E' was estimated at 0.75. The length-weight relationships for males and females were estimated, respectively as: W=0.01042×L 3.0101 and W=0.00952×L 3.042. The age data derived from the otolith readings were used to estimate the growth parameters of the von Bertalanffy growth equation. The estimated parameters were: L ∞ =35.5 cm, K=0.0849 and t o =-0.843 for females, otherwise they were: L ∞ =36.5 cm, K=0.0786 and to =-1.00382 for males. It was found that, both males and females matured at a total length of about 15.4 cm. The natural spawning period of this fish species is in the summer, from May to July.

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Section: Discussioncontrasting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

On the Biology of Siganus rivulatus Inhabits Bitter Lakes in Egypt

El-Drawany¹

2015

J Aquac Res Development

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“…The economically dominant emperor species in the investigated area are Lethrinus nebulosos, L. mahsena, L. borbonicus and L. lentjan. The snubnose emperor L. borbonicus represents the second most abundant emperor species in Sinai coast; it is prevalent in the catch of commercial and recreational fisheries in the Gulf of Suez in the vicinity of coral reefs (El Ganainy and Ahmed, 2002). It is also caught by gill nets and lines in southern coastal areas in depths shallower than 20 m, near shore at Gabal Elzeit, Abu Kafas, Laira, Abu Darba and further offshore near Ras Ghareb.…”

Section: Introductionmentioning

confidence: 99%

Age, growth, mortality rates and corresponding yield estimates of the snubnose emperor Lethrinus borbonicus from south Sinai coast, Gulf of Suez, Egypt

El-Ganainy

Amin

2012

Egypt. J. of Aquatic Biolo. and Fish.

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Age-based demographic analysis were conducted to assess the current status of fished stock of the snubnose emperor Lethrinus borbonicus in South Sinai coast, Gulf of Suez, Red Sea. L. borbonicus is one of the most abundant emperors in the area, representing about 10% of the total artisanal fishery in south Sinai coast. Seasonal samples were collected from the commercial small scale fishery during the period from June 2005 until April 2007. The otoliths were used for age determination. Validation of the ageing method was carried out by analyzing the seasonal length frequency distributions. The life span was found to be four years. The estimated von Bertalanffy growth parameters from otolith age reading were L ∞ = 36.76 cm, K= 0.344 year-1 and t o =-0.321. Instantaneous rates of fishing mortality (F) were beyond the limit reference point compared with estimated instantaneous rates of natural mortality (M), indicating that there is currently a risk to the sustainability of that stock. Results of the exploitation rate (E=0.583) and relative yield per recruit showed that the snubnose resource in the Gulf of Suez is overexploited and that small 16 individuals are the target of the fishery referring to recruitment overfishing also. Some implications for the fishery management for decreasing fishing effort are required.

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“…The φ in this study was higher than that estimated by Abu El-Nasr and El-Drawany, (2017) in Lake Timsah, (Egypt) where they found that, the φ for the same species equals 1.73.Thus, it could be reported that the environmental condition of Bardawil lagoon is better for the growth of T. puta under study. Such differences may be attributed partially from the different techniques used, but more likely reflect slight environmental differences such as food availability, Salinity and temperature (El -Ganainy and Ahmed, 2002).…”

Section: Results and Discussion Age And Growthmentioning

confidence: 99%

Age, growth and mortality of the small scaled Terapon puta (Cuvier, 1829) in Bardawill lagoon, North Sinai, Egypt

2017

Journal of Egyptian Academic Society for Environmental Developm

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Age, growth, and mortality of Terapon puta were studied from a small scale fishery of Bardawill lagoon, (North Sinai, Egypt). 2777 specimens (6.9 to 17.5 cm total Length and 14.1 to 55.9 g total weight), were collected from April to December, 2016. The relationship between length and weight was W = 0.0186L 2.7809 . Age was determined by otoliths and age groups 0 to 4 years were observed. Growths in length and weight at the end of each year were calculated. The growth parameters of von Bertalanffy equation were calculated as (L ∞ = 18.50, K = 0.3554 yr -1 and t 0 = -1.15 yr -1 ). Growth performance index was calculated (φ = 2.08 for length and φ= 0.75 for weight). Mortality rates were 0.90 yr -1 , 0.35 yr -1 and 0.55yr -1 for total, natural and fishing mortality, respectively. The currently exploitation rate E = 0.61. The probability of capture (Lc 50 = 12.7). The higher of fishing mortality verses natural mortality observed for T. puta indicates that its stock was overexploited in Bardawill lagoon.

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Growth, Mortality and Yield-Per-Recruit of the Rabbit Fish, Siganus Rjvula Tus, From the Eastern Side of the Gulf of Suez, Sinai Coast, Red Sea

Cited by 9 publications

References 13 publications

On the Biology of Siganus rivulatus Inhabits Bitter Lakes in Egypt

On the Biology of Siganus rivulatus Inhabits Bitter Lakes in Egypt

Age, growth, mortality rates and corresponding yield estimates of the snubnose emperor Lethrinus borbonicus from south Sinai coast, Gulf of Suez, Egypt

Age, growth and mortality of the small scaled Terapon puta (Cuvier, 1829) in Bardawill lagoon, North Sinai, Egypt

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