Open Access Original Research Article

Comparative Study on Growth and Survival Rate of Oreochromis niloticus (Linnaeus 1758) Treating with Supplementary Feed at Different Feeding Regime

Shyamal Kumar Paul, Md. Borhan Uddin Ahmed, Mehedi Mahmudul Hasan, Dhirendra Nath Barman, Mazharul Islam

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2018/v1i2266

This experiment was designed with three experimental treatments namely T1 (natural feed), T2 (feeding with 10% body weight) and T3 (feeding with 5% body weight) for ten weeks. In the content of 33.8% of crude protein (CP), 11.2% of crude fiber (CF), 6% of fat and 10.2% of ash content feed were used as an experimental diet in this experiment. The stocking densities were 280 fish decimal-1 in three treatments where the mean initial weight of fry was 20 ± 0.2 g in all treatments combined and at the end of the experiment the mean final weight was found as 58.9 ± 2.86 g, 134.4 ± 3.62 g and 142.5 ± 4.23 g for T1, T2, and T3 respectively. Mean initial length was 10.2 ± 0.01 cm in three treatments and final length was found as 14.58 ± 1.60 cm, 18.74 ± 1.23 cm and 20.16 ± 2.08 cm in T1, T2 and T3 respectively. The mean weight gains 38.9 ± 1.53 g, 114.4 ± 3.05 g and 122.5 ± 1.5 g, mean length gain 4.38 ± 0.24 cm, 8.54 ± 0.65 cm and 9.96 ± 0.59 cm, mean SGR 1.76%, 3.5% and 3.82% were recorded in T1, T2 and T3, respectively. The highest weight gain, length gain and SGR were found in T3 and the lowest was found in T1. The survival rate was 82%, 88% and 94% in T1, T2 and T3, respectively. FCR values were found as 3.49 ± 0.5 and 2.51 ± 0.4 in T2 and T3. The result demonstrated that feeding with 5% body weight had a better effect on the growth and survival rate of monosex (male) O. niloticus.

Open Access Original Research Article

Toxicity of Tobacco (Nicotiana tobaccum) Leaf Dust on Enzymatic and Protein Synthesis Activities of African Mud Catfish (Clarias gariepinus)

N. N. Nkpondion, O. A. Ugwumba, A. A. A. Ugwumba, I. K. Esenowo

Asian Journal of Fisheries and Aquatic Research, Page 1-9
DOI: 10.9734/ajfar/2018/v1i2282

The toxicity of tobacco (Nicotiana tobaccum) leaf dust with piscicidal and pesticidal properties was investigated on some enzymatic and protein synthesis activities of juvenile African mud catfish (Clarias gariepinus). Fish were exposed to both lethal and sub-lethal concentrations of tobacco leaf dust for 21 days in a renewal bioassay procedure. The median lethal concentrations (LC50) were derived using Finney probit method while protein and enzymatic activities were determined using Biuret and Randox methods respectively. The LC50 values for 48 hours acute bioassay test was 2.11g/l for tobacco leaf dust. Tobacco exposed fish showed significant increase (P≤0.05) in serum AST, ALT and ALP levels. Significant decrease (p≤0.05) were observed for liver AST (141.00 ± 2.52 to 154.67 ± 0.67), serum and liver total protein (6.47 ± 0.03 to 7.80 ± 0.40 and 3.30 ± 0.00 to 3.57 ±0.12)  and serum albumin (4.23 ± 0.09 to 4.83 ±0.20) across all concentrations. The study showed that exposure of C. gariepinus  juvenile to sub-lethal concentrations of tobacco (Nicotiana tobaccum) leaf dust can induce various toxicological effects in the form of enzymatic alteration. Therefore, the longer exposure of tobacco leaf dust in aquatic ecosystem is dangerous to fish and subsequently human health.

Open Access Original Research Article

Bioprospecting Novel Bioactive Molecules from the Seaweeds in Oman

Louay Labban, Amal Al Yaaqoubi, Ibrar Al Saadi, Aisha Al Kazrooni, Amira Al Jafari, Amira Al Wahaibi, Anwar Al Saadi

Asian Journal of Fisheries and Aquatic Research, Page 1-12
DOI: 10.9734/ajfar/2018/v1i2288

Seaweeds or marine macro-algae form the base for the marine ecosystems and considered as direct or indirect source of food for people across the world. Today, algae have made their way to almost all the areas of human life like food, feed, fuel, medicines etc. Marine algae provide exceptional diverse storage of bioactive compounds such as antimicrobial elements. 5 different varieties of seaweeds were collected from Salalah and they were: Ulva fasciata, Asparagopsis taxiform, Rhizoids of Jolyna laminarioide, Jolyna laminarioides and Laminaria brasiliensis. The biochemical composition of these seaweeds were determined by using several analytical techniques such as gas chromatography coupled with mass spectrometry and spectrophotometric methods. The phenolic content, antioxidant of TPC, DPPH (2,2-Diphenyl-1-Picrylhydrazyl) and FRAP analysis were measured. The results have shown a higher antioxidant activity in Brown (Rhizoids of Jolyna laminarioides) comparing with the other varieties. The antimicrobial activity of Ulva fasciataon on E. coli (G-) and Rhizoids of Jolyna laminarioides) on S. aureus (G+) was higher comparing with the control sample and the difference was significant (p < 0.05). In conclusion, this study points out the possibility of seaweeds to be used in making different products that can be employed in biotechnological, nutraceutical and pharmaceutical applications even though more investigations are required for separating, purifying and characterizing the varieties of seaweeds in Oman.

Open Access Original Research Article

Length-weight Relationship and Condition Factor of Blackspot Catfish Auchenoglanis biscutatus from the Lower River Benue Makurdi, Nigeria

Edem, Edem Thomas, Eyo, Victor Oscar, Ofunama Preye

Asian Journal of Fisheries and Aquatic Research, Page 1-7
DOI: 10.9734/ajfar/2018/v1i2295

This study was carried out to evaluate the length-weight relationship and condition factor of the Blackspot Catfish Auchenoglanis biscutatus from the Lower River Benue Makurdi, Nigeria. A total of 200 freshly caught specimens of A. biscutatus were collected from the catches of the artisanal fisheries from landing points at Wadata Market in Makurdi, between July and September 2013. The result obtained showed that the “b” value for the males was 1.6698, females (1.6201) and combined sexes (1.7318) indicating a negative allometric growth. Correlation coefficient (r) for males was 0.9524, females (0.9290) and combine sexes (0.9085). Monthly mean condition factor (K), indicated that both sexes of A. biscutatus were in good health condition. It is therefore concluded that findings of this study will be useful in the sustainable management of this species in the lower River Benue.

Open Access Original Research Article

Length-weight Relationship, Growth Pattern and Condition Factor of the Silver Catfish Chrysichthys nigrodigitatus (Lacepède, 1803) from Lower River Benue, Nigeria

Edem, Edem Thomas, Ofunama, Preye, Eyo, Victor `Oscar

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2018/v1i2301

This study was carried out to evaluate the length-weight relationship, growth pattern and condition factor of the Silver catfish Chrysichthys nigrodigitatus from the Lower River Benue Makurdi, Nigeria. A total of 200 freshly caught specimens of C. nigrodigitatus were collected between July 2013 and September 2013 from the catches of the artisanal fisheries at landing points in Wadata Market, Makurdi. Results obtained showed that the “b” value for the males was 1.6067 while that of the females was 1.6791 and combined sexes 1.7371, indicating a negative allometric growth for this species. Correlation coefficient (r) obtained for males (0.9651), 0.9517 (females) and 0.9329 (pooled sexes) showed a positive significant relationship between length and weight of C. nigrodigitatus. Monthly mean condition factor (K), indicate that C. nigrodigitatus were in good physiological health condition. In conclusion, the baseline data on the length-weight relationship, condition factor of C. nigrodigitatus from the lower River Benue provided in this study is crucial in the sustainable management of this species in the River. Also, these findings will be useful in evaluating the population dynamics, stock and the aquaculture potential of C. nigrodigitatus for future purpose.