2024-03-29T07:28:56Z
https://eja.journals.ekb.eg/?_action=export&rf=summon&issue=5445
Egyptian Journal for Aquaculture
2090-7877
2090-7877
2011
1
1
Effect of ambient seasonal changes in physical and chemical properties of the three types of ground water on the reproductive potential of Oreochromis niloticus reared in concrete ponds
Ashraf
Soliman
This study was conducted at the intensive fish farm of Arab Fisheries Company (AFC) to investigate the effect ambient seasonal variations of three types of ground water quality (pure aquifer, recycled aquifer water and 50% mixture of both) on the reproduction of Oreochromis niloticus, Highly significant increase in seed production per pond and newly hatched fry per kilogram of females per season were obtained in spring within the pure aquifer water (8013.33±5.89 seed/pond, 5520.00±3.62 seed/ kg female/season respectively). Highly significant (p<0.05) differences were observed during the four seasons under ambient condition for the three types of water. The total fry production and/or relative fecundity of brooders were highly significant (p<0.05) 280041.25±40.3, 951.72±19.33 respectively under ambient condition of spring in pure aquifer water. In addition, highly significant differences (p<0.05) were found in water temperature among the studied four seasons. Although a wide variation in the ambient seasonal changes, the quality of water in reproduction pond were within the optimal range that required for reproduction of O. niloticus.
ground water
water quality
Reproduction
Oreochromis niloticus
2011
05
01
1
15
https://eja.journals.ekb.eg/article_32007_81987540d70bb0555f473d047e97c8b9.pdf
Egyptian Journal for Aquaculture
2090-7877
2090-7877
2011
1
1
A morphological study (SEM) on a parasitic marine isopod, Cymothoa spinipalpa (Isopoda: Cymothoidae)
Ahmed
Abd El Aal
ِAhmed
El Ashram
The incidence of parasitic marine isopods among wild 100 Argyrops filamentosus fish was studied. Specimens were subjected to clinical, postmortem and parasitological examinations for detection of isopod infestations. The detected parasite was Cymothoa spinipalpa. The infestation rate was 9%, one per fish. Cymothoa spinipalpa was observed in the gill chamber and buccal cavity of the host. Slight protrusion of gill cover (operculum), atrophy and haemorrhage at site of attachment were noticed. The morphological characteristics of this species were described in details using light and scanning electron microscopy and discussed.
2011
05
01
17
26
https://eja.journals.ekb.eg/article_32039_6f22f698920b57f6bc432a5fbe9b9e4d.pdf
Egyptian Journal for Aquaculture
2090-7877
2090-7877
2011
1
1
Zooplankton as natural live food for three different fish species under concrete ponds with mono-and polyculture conditions
Ahmed
Hassan
The present study was conducted to evaluate the effect of using zooplankton as a live food for Nile tilapia (Oreochromis niloticus), mullet (Mugil cephalus) and common carp (Cyprinus carpio) under monoculture and polyculture condition in concrete ponds on water quality, plankton abundance, growth, survival, stomach content and chemical composition of experimental fish. Twenty four concrete ponds were used at the Central Laboratory for Aquaculture Research (CLAR), Abbassa-Sharkia Governorate- Egypt. The experimental period extended for 140 days. The results showed that, water pH, nitrogen compounds (NH4, NO2 and NO3), dissolved oxygen and chlorophyll "a" significantly increased in ponds of artificial feed than those of zooplankton live food only. Using of zooplankton as a live food for fish improved the quality of fish. The water quality did not significantly (P>0.05) differ between monoculture and polyculture in the same feeding regimes. The results indicated also that, using zooplankton as a live food for fish species significantly (P<0.05) increased growth performance than those fed artificial feed. On the other hand, the growth performance of common carp has significantly (P<0.05) increased than Nile tilapia and mullet. Also, zooplankton was enough for fish to achieve suitable growth more than artificial feed. The detritus increased significantly in case of fish species fed with artificial feed, while it did not increase significantly in zooplankton live food treatments
Live food
artificial food
tilapia
Mullet
Common Carp
monoculture
polyculture
concrete ponds
2011
05
01
27
41
https://eja.journals.ekb.eg/article_32040_ddc68ec5d1bd6f91e14791e157c49f8c.pdf
Egyptian Journal for Aquaculture
2090-7877
2090-7877
2011
1
1
Cold tolerance of selective breeding of Oreochromis niloticus and oreochromis aureus
Mahmoud
Rezk
Ebtehag
Kamel
Selected fish for higher growth rate from both O. niloticus and O. aureus were collected and subjected to challenge test for cold. In addition to, fish of both species collected from production ponds of Abbassa were used to compare the cold tolerance of fish. Fry of similar age were grown under identical conditions. O. niloticus with an average weight of 1.29 ±0.73 g and 0.95 ±0.11 g, for O. aureus were used in this study. The selected O. niloticus revealed lower cold tolerance than the non-selected fish. The cooling degree hours were significantly different between the selected and non-selected O. niloticus (P<0.005). The selected O. aureus exhibited greater cold tolerance than the non-selected and death began at 14.1 oC, while nonselected occurred at 15.2 oC. The lowest lethal temperature of 50% individuals was 8.7 oC for selected O. aureus at 198 cooling degree hours (CDH) and 9.3 oC for non-selected fish at 147 CDH. Both selected and non-selected fish gave lowest lethal temperature of 60% individuals at 8.5 oC. But in different degree hours which was longer in selected (220 CDH) and shorter in non-selected (182CDH) .The selected fish with stood 330 cooling hours which was higher than that for the non-selected fish (311 CDH). There was strong relationship between the cold and both temperature at death and cumulative degree hours represented by negative correlation coefficient for all tested fish (-0.928± 0.014). There was no correlation between cold tolerance and fish size for all tested fish.
2011
05
01
43
53
https://eja.journals.ekb.eg/article_32049_4a776074f94358c92f67f9f37ca71a2f.pdf
Egyptian Journal for Aquaculture
2090-7877
2090-7877
2011
1
1
Beneficial using of EDTA to reduce cadmium toxicity and to improve the physiological and biochemical profiles of catfish (Clarias gariepinus)
Ashraf
Ramadan
Adel
Shalaby
Mostafa
El Gammal
El-Sadiq M El Aganif
El Aganif
Mohamed
Ebrahim
EDTA form metal-EDTA complexes which have its effectiveness in mobilizing of the contaminant metal ions, especially cadmium. This work was carried out to investigate the effect of the ion –exchanging (chelating) agent EDTA on cadmium (Cd) toxicity and its impact on haematological and biochemical changes in catfish (Clarias gariepinu)). The fish (160-180g ) were exposed to 12 ppm Cd alone or with 0.1, 0.2 and 0.3 g EDTA/L for 3, 10 and 45 days. Cd exposure reduced significantly (P<0.05) erythrocyte count (RBCs), haemoglobin content (Hb), haematocrit value (Hct), mean cell volume (MCV) mean cell haemoglobin (MCH) and mean cell haemoglobin concentration (MCHC). These parameters were improved when EDTA was applied with Cd. The values of RBCs , Hb, Hct, MCV, MCH and MCHC were increased significantly to be as in the control fish group. There was significant decreases in plasma total protein (TP) in fish exposed to Cd alone. The levels of plasma glucose, total lipids (LP), aspartate aminotranseferase (AST), alanine aminotransferase (ALT) were increased significantly in fish exposed to Cd alone. Addition of EDTA to Cd contaminated medium enhanced biochemical parameters in fish and the enzyme activities returned to be as the control fish group. Addition of EDTA to Cd contaminated medium considerably reduced metal absorption and its accumulation in fish tissues, and reduced metals in water. Fish exposed to Cd alone accumulates 2.93, 4.33 and 7.2 mg Cd/g dry weight in body fish for 3, 10 and 45 days, respectively. Cd was reduced significantly to 0.13, 0.17 and 0.22 mg Cd/g dry weight in fishes exposed to 0.1, 0.2 and 0.3g EDTA/L for 3,10 and 45 days, respectively these values were similar to those of control group.
2011
05
01
55
69
https://eja.journals.ekb.eg/article_32050_a5660a02f223deb18b17ccdf3db6a732.pdf
Egyptian Journal for Aquaculture
2090-7877
2090-7877
2011
1
1
Effect of Microcystis aeruginosa blooming on the production of Nile tilapia (Oreochromis niloticus) in fish ponds
Mostafa
Elgammal
Ashraf
Ramadan
Reasons for low fish farm production at Eltel El-kabeer area, Ismailia Governorate were unknown. At the concerned area, fish survival rates have been dropped to reach less than 10% for several consecutive years. Some of the conducted studies, concerning the high mortality rates in the concerned area, claimed that that phenomenon was initially referred to cyanobacterium blooming (Microcystis aeruginosa) thought to be ingested by fish during feeding, or assimilated through gills during breathing. Twelve earthen ponds (each of 2000 m2 area, 100-120 cm water depth, fertilized by 125 kg chicken manure / pond / week for a period of 16 weeks, and stocked with 5000 Nile tilapia fry with a weight ranged 5-7 gm) were used in the study and were divided equally into two studied groups. The first pond group was full of Microcystis aeruginosa bloom, while the second pond group was free of Microcystis aeruginosa bloom. Fish were stocked in the two previously mentioned studied pond groups, fed on feeding rate at 3 % of live body weight. Commercial floating fish diet with 25% protein content was used in fish feeding. Physicochemical parameters, plankton population, fish survival, fish production, and toxicity test for different fish size (5, 20, 50, 150 grams). In addition, Artemia also were studied. There was a significant difference between the two studied pond groups concerning all physical and chemical water characteristics investigated. Those investigated water characteristics were: dissolved oxygen, visibility, salinity, total suspended solid (TSS), alkalinity, total phosphorus and Ammonium (NH4). On the other hand, there was no significant difference between the two studied pond groups concerning each of temperature, pH, electric conductivity (EC), Hardness, nitrate (NO3) ammonium (NH3) and chlorophyll ―a‖. In general, all investigated values were within the suitable range for tilapia growth. The abundance of phytoplankton in number was highly significant in the first research pond group concerning each of Cyanophyta, Euglenophyta, and Microcystis aeruginosa in blooming, and was not significant in Baciloarophyta and Chlorophyta. In addition, Zooplankton was significant in numbers concerning Cladocera, Rotifers and Copepoda and was not significant in total zooplankton number. Fish and Artemia exposed to pond with Microcystis blooming died within 24 hours. The research drew the attention towards conducting more future research studies in this concern as a way to control the toxic algae of Microcystis aeruginosa in fish ponds.
Microcystis aeruginosa
Fish production
water quality
phytoplankton
Zooplankton
2011
05
01
71
88
https://eja.journals.ekb.eg/article_32051_69849efb192d9abb94c86f8cd960a771.pdf