MUTASIM Y O U S I F M O H A M E D ABDALLA (original) (raw)

Papers by MUTASIM Y O U S I F M O H A M E D ABDALLA

Global Journal of Fisheries Science, 2021

This study was undertaken to assess the length-weight relationship, condition factor and age stru... more This study was undertaken to assess the length-weight relationship, condition factor and age structure, of the Nile carp, Labeo niloticus, in Khashm El-Girba reservoir and Atbara River, Sudan, from December 2015 to November 2016. Samples of fish were collected bimonthly from three locations, namely; Um Aswad (Atbara River), El-Remila and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2, 4.0 and 7.0 cm stretched mesh. Out of a total number of 1,190 specimens of L. niloticus collected from the three sampling sites, 189 specimens were randomly selected to determine age. The relationship between length and weight indicated negative allometric growth pattern in all three locations, where the slope (b) of the (LWR) was highly significant (p<0.001) and ranged from 2.178 to 2.885. The mean condition factor (K) varied monthly in the three locations with values ranging from 1.671 in Um Aswad (Atbara River) to 2.548 in El-Monaba (reservoir). Although the age of L. niloticus ranged from 0+ and 3+ years, yet, most of the studied fish are between age 0 + and 1+.

Journal of Fisheries and Marine Research, 2023

This study aimed to investigate the abundance, length-weight relationship, and condition factor o... more This study aimed to investigate the abundance, length-weight relationship, and condition factor of Oreochromis niloticus (L. 1758) in the Khashm El-Girba reservoir and Atbara River. The survey was conducted from December 2015 to November 2016. Samples were collected bimonthly from three sites: Um Aswad (Atbara River), El-Remila, and El-Monaba (The reservoir), using seine beach nets of 1.2, 4, and 7 cm stretched bar mesh. A total of 1595 O. niloticus specimens were collected from all sampling sites. Out of the total catch, O. niloticus was found dominant in the Khashm El-Girba reservoir. It contributed 25.67% and 19.12% El-Remila and El-Monaba, respectively, and represented 15.13% at Um Aswad (Atbara River). This study indicates two increase periods of abundance for O. niloticus in the upper stream and only one increase of abundance downstream. The length-weight relationship of O. niloticus species indicates that the allometric growth pattern b value fluctuated between 2.78 and 2.96. The mean condition factor of O. niloticus ranged between 2.55 to 3.56.

International Journal of Fisheries and Aquatic Studies, 2024

The study aimed to estimate the population bio-parameters of Labeo senegalensis from the Khashm E... more The study aimed to estimate the population bio-parameters of Labeo senegalensis from the Khashm El-Girba reservoir using length-frequency; The investigation was conducted during January-December 2020. A total of 1207 specimens were collected using gillnets mesh sizes 1.2, 2.5, and 4 cm. The total length ranged between 8.8 and 40.5 cm using a standard measuring board and the weight was recorded to the nearest 1.0 g using digital balance FRUIT 2000B. The length-weight relationship indicated very highly significant (r = 0.996) negative allometric growth with a b-value of 2.280. Length-frequency data was used in ELEFAN I in FiSAT II to obtain the von Bertalanffy growth parameters. The asymptotic length (L∞) was 42 cm, the growth coefficient (K) was 0.490 year-1 , and t0=-0.518 year-1. The growth performance index (Փ') was 2.937 and longevity (Tmax) was 5.604 years. The total mortality (Z) was 1.41 year-1 ; natural mortality (M) according to Pauly's empirical equation was 0.98 year-1 , and fishing mortality (F) was 0.43 year-1. The first capture (Lc) and maturity length (Lm) were 23.48 and 25.26cm, respectively. The first L25 and L75 were 22.27 and 25.61 cm, respectively. Annual recruitment occurred from April to August. The exploitation rate (E) was 0.31 year-1 indicating fishing pressure less than the optimum exploitation rate of 0.5. The study suggested banning use of small mesh-sized nets as a managerial strategy for L. senegalensis fisheries.

Asian Journal of Research in Zoology, 2024

This study was carried out to investigate the length-weight relationship and condition factor of ... more This study was carried out to investigate the length-weight relationship and condition factor of the Mochokid catfish S. schall, a commercially important fish species in the Roseires reservoir on the Blue Nile, Sudan. A total of 643 specimens were collected using the multi-filament gillnets of mesh

Asian Journal of Research in Zoology, 2020

The present study was carried out to investigate some aspects of the biology of Oreochromis nilot... more The present study was carried out to investigate some aspects of the biology of Oreochromis niloticus, it has ecological and economic importance, found in Khashm El-Girba market; here, we describe the length-weight relationships, condition factors and sex ratio of O. niloticus. A total of 525 specimens were collected from August to November 2016. This study indicated that; the regression of length against weight was computed from the relationship W= a L b ; growth coefficient (b) value 2.880 ±0.430 less than 3, which indicate have negative allometric growth. The condition factors (K) is 3.866 ± 0.027; While the sex ratio was (M: F) 1:0.98.

Asian Journal of Research in Zoology, 2024

Previous studies of the freshwater fish diversity and composition in Sudan were reviewed; A total... more Previous studies of the freshwater fish diversity and composition in Sudan were reviewed; A total number of 132 fish species belonging to 68 genera and 27 families were identified from the rivers, lakes and wetlands in Sudan, showing a significant increase in species richness compared to previous reports. The majority of these species belonged to families such as Cyprinidae, Mormyridae, Mochokidae and Cichlidae; The White Nile exhibited the highest biodiversity and richness of species, with 120 fish species (91%), followed by Lake Nubia (41%) and the Blue Nile (36%). Seasonal rivers (Atbara and Dinder Rivers) showed relatively low diversity, representing

Asian Journal of Fisheries and Aquatic Research, 2024

This study was conducted to assess the population parameters of Nile tilapia, Oreochromis nilotic... more This study was conducted to assess the population parameters of Nile tilapia, Oreochromis niloticus, in the Khashm El-Girba Dam Reservoir in Eastern Sudan. Fish samples were collected from December 2019 to November 2020. Length-frequency data were collected from 1,671

Asian Journal of Research in Zoology, 2024

This study aims to investigate some reproductive aspects of Nile tilapia, Oreochromis niloticus i... more This study aims to investigate some reproductive aspects of Nile tilapia, Oreochromis niloticus in the Khashm El-Girba reservoir and Atbara River, eastern Sudan. The study was conducted during December 2015 to November 2016. Samples were collected bimonthly basis from three localities, namely; Um Aswad (Atbara River), El-Remila, and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2 cm 4.0 cm and 7.0 cm stretched mesh. A total of 1595 O. niloticus specimens were collected from all sampling sites. The age of O. niloticus was estimated using five anterior vertebrae of fish body; The results indicate that the age ranged between 0+ to 4+ years. Most of the collected fish specimens were of age 1+, with females most dominant at this age. Sex ratio was 1:1(M: F). Gonado-somatic index (GSI) of females of O. niloticus ranged between 1.965-2.620, and from 0.434-0.439 for males. Two periods of increase of GSI were observed reflecting two breeding seasons of this species. Used gravimetric method to estimate the average fecundity of O. niloticus ranged between 481 eggs in Um Aswad sampling site, and 638 in El-Remila site. The fecundity of O. niloticus has a high correlation with gonadal weight (r=0.82708) but a low correlation with standard length (r=0.47612) and total weight (r=0.50874). The results of this investigation on O. niloticus indicate that the age of the fish ranged from 0+ to 4+ years, with a sex ratio of 1:1. The Gonado-somatic Index (GSI) indicated two spawning seasons, and fecundity was found to be strongly correlated with gonad weight, and moderately correlated with total length and standard length. This results can be used formulate management policies and procedures for protecting and conserving the fisheries resources and to regulate and improve the catches of the most important commercial fish species in that region.

Study of Some Biological Aspects of the Nile Carp, Labeo niloticus (Pisces, Cyprinidae) from Khashm El-Girba Reservoir and Atbara River, Sudan: I Abundance; Sex Ratio; Gonado-somatic Index and Breeding Season, 2020

The aim of this study is to investigate some biological aspects of the Nile carp, Labeo niloticus... more The aim of this study is to investigate some biological aspects of the Nile carp, Labeo niloticus, in Khashm El-Girba reservoir and Atbara River, Sudan. The study was conducted during December 2015 to November 2016. Samples were collected bimonthly from three localities, namely; Um Aswad (Atbara River), El-Remila and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2 cm 4.0 cm and 7.0 cm stretched mesh. A total number of 1,190 specimens of L. niloticus were collected from the three sampling sites. Two peaks of abundance were observed for Original Research Article

Investigation on Some Biological Aspects of Nile Tilapia, Oreochromis niloticus (L. 1758) from Khashm El-Girba Fish Market, Sudan: Length Weight Relationship, Condition Factor and Sex Ratio, 2020

The present study was carried out to investigate some aspects of the biology of Oreochromis nilot... more The present study was carried out to investigate some aspects of the biology of Oreochromis niloticus, it has ecological and economic importance, found in Khashm El-Girba market; here, we describe the length-weight relationships, condition factors and sex ratio of O. niloticus. A total of 525 specimens were collected from August to November 2016. This study indicated that; the regression of length against weight was computed from the relationship W= a L b ; growth coefficient (b) value 2.880 ±0.430 less than 3, which indicate have negative allometric growth. The condition factors (K) is 3.866 ± 0.027; While the sex ratio was (M: F) 1:0.98.

Global Journal of Fisheries Science, 2021

This study was undertaken to assess the length-weight relationship, condition factor and age stru... more This study was undertaken to assess the length-weight relationship, condition factor and age structure, of the Nile carp, Labeo niloticus, in Khashm El-Girba reservoir and Atbara River, Sudan, from December 2015 to November 2016. Samples of fish were collected bimonthly from three locations, namely; Um Aswad (Atbara River), El-Remila and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2, 4.0 and 7.0 cm stretched mesh. Out of a total number of 1,190 specimens of L. niloticus collected from the three sampling sites, 189 specimens were randomly selected to determine age. The relationship between length and weight indicated negative allometric growth pattern in all three locations, where the slope (b) of the (LWR) was highly significant (p<0.001) and ranged from 2.178 to 2.885. The mean condition factor (K) varied monthly in the three locations with values ranging from 1.671 in Um Aswad (Atbara River) to 2.548 in El-Monaba (reservoir). Although the age of L. niloticus ranged from 0+ and 3+ years, yet, most of the studied fish are between age 0 + and 1+.

Journal of Fisheries and Marine Research, 2023

This study aimed to investigate the abundance, length-weight relationship, and condition factor o... more This study aimed to investigate the abundance, length-weight relationship, and condition factor of Oreochromis niloticus (L. 1758) in the Khashm El-Girba reservoir and Atbara River. The survey was conducted from December 2015 to November 2016. Samples were collected bimonthly from three sites: Um Aswad (Atbara River), El-Remila, and El-Monaba (The reservoir), using seine beach nets of 1.2, 4, and 7 cm stretched bar mesh. A total of 1595 O. niloticus specimens were collected from all sampling sites. Out of the total catch, O. niloticus was found dominant in the Khashm El-Girba reservoir. It contributed 25.67% and 19.12% El-Remila and El-Monaba, respectively, and represented 15.13% at Um Aswad (Atbara River). This study indicates two increase periods of abundance for O. niloticus in the upper stream and only one increase of abundance downstream. The length-weight relationship of O. niloticus species indicates that the allometric growth pattern b value fluctuated between 2.78 and 2.96. The mean condition factor of O. niloticus ranged between 2.55 to 3.56.

International Journal of Fisheries and Aquatic Studies, 2024

The study aimed to estimate the population bio-parameters of Labeo senegalensis from the Khashm E... more The study aimed to estimate the population bio-parameters of Labeo senegalensis from the Khashm El-Girba reservoir using length-frequency; The investigation was conducted during January-December 2020. A total of 1207 specimens were collected using gillnets mesh sizes 1.2, 2.5, and 4 cm. The total length ranged between 8.8 and 40.5 cm using a standard measuring board and the weight was recorded to the nearest 1.0 g using digital balance FRUIT 2000B. The length-weight relationship indicated very highly significant (r = 0.996) negative allometric growth with a b-value of 2.280. Length-frequency data was used in ELEFAN I in FiSAT II to obtain the von Bertalanffy growth parameters. The asymptotic length (L∞) was 42 cm, the growth coefficient (K) was 0.490 year-1 , and t0=-0.518 year-1. The growth performance index (Փ') was 2.937 and longevity (Tmax) was 5.604 years. The total mortality (Z) was 1.41 year-1 ; natural mortality (M) according to Pauly's empirical equation was 0.98 year-1 , and fishing mortality (F) was 0.43 year-1. The first capture (Lc) and maturity length (Lm) were 23.48 and 25.26cm, respectively. The first L25 and L75 were 22.27 and 25.61 cm, respectively. Annual recruitment occurred from April to August. The exploitation rate (E) was 0.31 year-1 indicating fishing pressure less than the optimum exploitation rate of 0.5. The study suggested banning use of small mesh-sized nets as a managerial strategy for L. senegalensis fisheries.

Asian Journal of Research in Zoology, 2024

This study was carried out to investigate the length-weight relationship and condition factor of ... more This study was carried out to investigate the length-weight relationship and condition factor of the Mochokid catfish S. schall, a commercially important fish species in the Roseires reservoir on the Blue Nile, Sudan. A total of 643 specimens were collected using the multi-filament gillnets of mesh

Asian Journal of Research in Zoology, 2020

The present study was carried out to investigate some aspects of the biology of Oreochromis nilot... more The present study was carried out to investigate some aspects of the biology of Oreochromis niloticus, it has ecological and economic importance, found in Khashm El-Girba market; here, we describe the length-weight relationships, condition factors and sex ratio of O. niloticus. A total of 525 specimens were collected from August to November 2016. This study indicated that; the regression of length against weight was computed from the relationship W= a L b ; growth coefficient (b) value 2.880 ±0.430 less than 3, which indicate have negative allometric growth. The condition factors (K) is 3.866 ± 0.027; While the sex ratio was (M: F) 1:0.98.

Asian Journal of Research in Zoology, 2024

Previous studies of the freshwater fish diversity and composition in Sudan were reviewed; A total... more Previous studies of the freshwater fish diversity and composition in Sudan were reviewed; A total number of 132 fish species belonging to 68 genera and 27 families were identified from the rivers, lakes and wetlands in Sudan, showing a significant increase in species richness compared to previous reports. The majority of these species belonged to families such as Cyprinidae, Mormyridae, Mochokidae and Cichlidae; The White Nile exhibited the highest biodiversity and richness of species, with 120 fish species (91%), followed by Lake Nubia (41%) and the Blue Nile (36%). Seasonal rivers (Atbara and Dinder Rivers) showed relatively low diversity, representing

Asian Journal of Fisheries and Aquatic Research, 2024

This study was conducted to assess the population parameters of Nile tilapia, Oreochromis nilotic... more This study was conducted to assess the population parameters of Nile tilapia, Oreochromis niloticus, in the Khashm El-Girba Dam Reservoir in Eastern Sudan. Fish samples were collected from December 2019 to November 2020. Length-frequency data were collected from 1,671

Asian Journal of Research in Zoology, 2024

This study aims to investigate some reproductive aspects of Nile tilapia, Oreochromis niloticus i... more This study aims to investigate some reproductive aspects of Nile tilapia, Oreochromis niloticus in the Khashm El-Girba reservoir and Atbara River, eastern Sudan. The study was conducted during December 2015 to November 2016. Samples were collected bimonthly basis from three localities, namely; Um Aswad (Atbara River), El-Remila, and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2 cm 4.0 cm and 7.0 cm stretched mesh. A total of 1595 O. niloticus specimens were collected from all sampling sites. The age of O. niloticus was estimated using five anterior vertebrae of fish body; The results indicate that the age ranged between 0+ to 4+ years. Most of the collected fish specimens were of age 1+, with females most dominant at this age. Sex ratio was 1:1(M: F). Gonado-somatic index (GSI) of females of O. niloticus ranged between 1.965-2.620, and from 0.434-0.439 for males. Two periods of increase of GSI were observed reflecting two breeding seasons of this species. Used gravimetric method to estimate the average fecundity of O. niloticus ranged between 481 eggs in Um Aswad sampling site, and 638 in El-Remila site. The fecundity of O. niloticus has a high correlation with gonadal weight (r=0.82708) but a low correlation with standard length (r=0.47612) and total weight (r=0.50874). The results of this investigation on O. niloticus indicate that the age of the fish ranged from 0+ to 4+ years, with a sex ratio of 1:1. The Gonado-somatic Index (GSI) indicated two spawning seasons, and fecundity was found to be strongly correlated with gonad weight, and moderately correlated with total length and standard length. This results can be used formulate management policies and procedures for protecting and conserving the fisheries resources and to regulate and improve the catches of the most important commercial fish species in that region.

Study of Some Biological Aspects of the Nile Carp, Labeo niloticus (Pisces, Cyprinidae) from Khashm El-Girba Reservoir and Atbara River, Sudan: I Abundance; Sex Ratio; Gonado-somatic Index and Breeding Season, 2020

The aim of this study is to investigate some biological aspects of the Nile carp, Labeo niloticus... more The aim of this study is to investigate some biological aspects of the Nile carp, Labeo niloticus, in Khashm El-Girba reservoir and Atbara River, Sudan. The study was conducted during December 2015 to November 2016. Samples were collected bimonthly from three localities, namely; Um Aswad (Atbara River), El-Remila and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2 cm 4.0 cm and 7.0 cm stretched mesh. A total number of 1,190 specimens of L. niloticus were collected from the three sampling sites. Two peaks of abundance were observed for Original Research Article

Investigation on Some Biological Aspects of Nile Tilapia, Oreochromis niloticus (L. 1758) from Khashm El-Girba Fish Market, Sudan: Length Weight Relationship, Condition Factor and Sex Ratio, 2020

The present study was carried out to investigate some aspects of the biology of Oreochromis nilot... more The present study was carried out to investigate some aspects of the biology of Oreochromis niloticus, it has ecological and economic importance, found in Khashm El-Girba market; here, we describe the length-weight relationships, condition factors and sex ratio of O. niloticus. A total of 525 specimens were collected from August to November 2016. This study indicated that; the regression of length against weight was computed from the relationship W= a L b ; growth coefficient (b) value 2.880 ±0.430 less than 3, which indicate have negative allometric growth. The condition factors (K) is 3.866 ± 0.027; While the sex ratio was (M: F) 1:0.98.