Length-Weight Relationship and Condition Factor of Some Fishes from the River Nile in Egypt with Special Reference to Four Tilapia Species

Shalloof, Kariman A. Sh.; Far, Alaa M. El

doi:10.21608/ejabf.2017.3296

Cited by 13 publications

(9 citation statements)

References 14 publications

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“…This indicates that fishes grow almost symmetrically or isometrically in weight with length if its specific gravity remains constant which agree with the previous studies on these species in Egyptian waters (Ibrahim et al, 2007). Also, the result of this study agree with that of Shalloof and El-Far, (2017) who found in their study of length-weight relationship of some fishes from the River Nile that the value of (a) and (b) were 0.018 and 3.017 for O. niloticus and 0.019 and 2.997 for T. zillii.…”

Section: Discussionsupporting

confidence: 92%

“…Average condition factor for the species are close to these recorded for the same species. Shalloof and El-Far, (2017) reported in their study of condition factor of some fishes from the River Nile that the average K c for B. bayad, C. gariepinus, O. niloticusis, S. galilaeus and T. zillii were 0.954, 0.710, 1.919, 2.006 and 1.917, respectively which are comparable to that recorded in this study.…”

Section: Discussionsupporting

confidence: 86%

See 1 more Smart Citation

Assessment of Short-term Effects of Pollution Accident on Fisheries in River Nile, Egypt

Aly¹,

Shalloof²

2019

Egypt. J. of Aquatic Biolo. and Fish.

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Fisheries This study outlines the immediate impact on local fisheries of the incident that took place on 21 st April 2015. A barge capsized in the Nile in Upper Egypt's Qena governorate after colliding with the foundations of the city's Dandara Bridge. The capsized barge was carrying 500 tons of phosphate (pre-industrial, inert material) for processing in a local factory. The study aimed to record any apparent effect of the incident on the fisheries in the immediate site vicinity and downstream. Also, it described the status quo of the fisheries around the incident location to compare it with the situation before the accident to confirm any short-term impact and to establish a baseline for any future, long-term, impact studies. Data were collected on fish assemblage structure in the incident site vicinity, the number of fishing boats and fishing methods that were applied to catch them. Furthermore, some fisheries biological parameters were assessed. The main conclusions derived from the study were that fishing in the vicinity of the incident is artisanal with small boats and simple fishing gears. The fisheries biological parameters of the area's fishery are comparable to that of other similar environs, and that the incident did not have an apparent short term effect on the fishery profile of the area. The main recommendations resulted from this study were that the impact of the incident on fish at the molecular level should be studied and that the state of fisheries in the area should be followed up to detect any long-term impact of the incident.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 86%

Assessment of Short-term Effects of Pollution Accident on Fisheries in River Nile, Egypt

Aly¹,

Shalloof²

2019

Egypt. J. of Aquatic Biolo. and Fish.

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“…this type of growth indicates that the fish becomes relatively stouter or deeper-bodied as it increases in length [30]. This pattern was reported for O. niloticus by Mortuza and Al-Misned [31], Kembenya et al [32], Shalloof and El-Far [33], Cuadrado et al [34], Negaud [13], and Mohamed and Al-Wan [35] from various water bodies in the world. However, some authors reported negative allometric growth for this species in other waters, such as Novaes and Carvalho [36], Hassan and El-Kasheif [37], Khalifa [38], Teame et al [39], and Enawgaw and Lemma [40].…”

Section: Discussionsupporting

confidence: 61%

Assessment of two cichlids stocks with virtual population analysis in Garmat Ali River, Basrah, Iraq

Mohamed¹

2022

World J. Adv. Res. Rev.

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The study is an attempt to evaluate the population characteristics and virtual population analysis (VPA) of two invasive species (Oreochromis niloticus and Oreochromis aureus) using the FiSAT II software based on the data collected from the Garmat Ali River, Iraq. A total of 4391 individuals (2727 of O. niloticus and 1664 of O. aureus) were measured for length-frequency analysis from October 2019 to September 2020. Length-weight relationships were derived, indicating allometric growth for both species. The asymptotic length (L∞) and growth rate constant (K) were estimated to be 30.5 cm and 0.45 for O. niloticus and 29.9 cm and 0.21 for O. aureus. The annual rates of fishing (F) and exploitation (E) for O. niloticus were found to be 2.24 and 0.69, respectively, and for O. aureus 0.48 and 0.43, respectively. The present exploitation rates (E) of both species were below the biological target reference points, E0.1 and Emax, thus expressing a case of under-exploitation of both species. Besides, the result of the virtual population analysis (VPA) revealed that the majority of O. niloticus and O. aureus individuals were harvested at lengths 20 cm and 17 cm, respectively. Also, the lengths at first capture (L50) for both species were considerably higher than their lengths at first maturity (Lm). Therefore, for management purposes, this study suggests that more yields can be obtained by increasing the fishing activities on these invasive species, such as increasing the number of fishing boats and decreasing the mesh size to decline its abundance in the long term.

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“…Research on the growth patterns or condition factors of the mudskipper has yet to be reported for Aceh Province. These parameters can be identified by measuring the length-weight relationship (LWRs) of fish in order to estimate the biomass of certain fish stocks and to manage fisheries resources (Karna et al 2018, Shalloof andEl-Far 2017) and as an indicator of fish condition (Froese 2006, Koutrakis andTsikliras 2003). Moreover, Muchlisin et al (2010) mentioned that growth patterns are critical parameters in fish farming because they can determine the results of cultivation.…”

Section: Introductionmentioning

confidence: 99%

Growth patterns and condition factor of the mudskipper (Periophthalmus gracilis) in mangrove ecosystem rehabilitation areas in Banda Aceh and Aceh Besar, Indonesia

Dewiyanti

Melanie

Almuniro

et al. 2022

Fisheries &Amp; Aquatic Life

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The mudskipper is one of the fishes that inhabit mangrove ecosystems. Its growth and distribution is influenced by food sources, tidal action, and environmental factors. The aims of the research were to analyze the growth patterns and condition factors of the mudskipper, Periophthalmus gracilis Eggert, inhabiting mangrove ecosystem rehabilitation areas in Banda Aceh and Aceh Besar, Aceh Province, Indonesia. The research period in these mangrove ecosystems was from August to October 2020. The research was conducted at three sampling stations using the purposive sampling method to determine their location. The mudskippers caught at each station were identified and body length and weight were measured. Physicochemical water parameters were measured directly at the sampling stations to determine the suitability of them for mudskipper growth and occurrence. The mean total lengths (TL) and weights (W) of the mudskipper specimens caught at stations 1, 2, and 3 were 52.0 mm and 6.2 g; 53.5 mm and 6.4 g, and 56.0 mm 6.7 g, respectively. The growth patterns of the mudskippers from the three sampling stations were negative (b < 3), and Fulton’s condition factor (K) exceeded 1. The K value at stations 1, 2, and 3 ranged from 1.28 to 3.62, 1.15 to 3.56, and 1.05 to 3.89, respectively. The relative weights (Wr) at the three stations were 103.8 ± 26.5, 104.3 ± 29.3, and 104.1 ± 28.2, respectively. Wr >100 indicated that there was sufficient food availability, low predator density, and the environment was in equilibrium. Furthermore, physicochemical water parameters at the study stations were suitable and within optimal ranges for the mudskipper. Significant differences in total length were noted among specimens from the three stations (P < 0.05); however, no significant differences in body weight were noted at them (P > 0.05).

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Length-Weight Relationship and Condition Factor of Some Fishes from the River Nile in Egypt with Special Reference to Four Tilapia Species

Abstract: This study has been carried out along the River Nile (river main stream, Rosetta and Damietta branches) in Egypt. Fish Samples of 21 species belonging to 11 families were collected mainly from the catch of three fishing gears and methods, Trammel net, Traps, and Long

Cited by 13 publications

References 14 publications

Assessment of Short-term Effects of Pollution Accident on Fisheries in River Nile, Egypt

Assessment of Short-term Effects of Pollution Accident on Fisheries in River Nile, Egypt

Assessment of two cichlids stocks with virtual population analysis in Garmat Ali River, Basrah, Iraq

Growth patterns and condition factor of the mudskipper (Periophthalmus gracilis) in mangrove ecosystem rehabilitation areas in Banda Aceh and Aceh Besar, Indonesia

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