Open Access Original Research Article

Comparative Assessment of Nutrient Composition of Aquacultured and Wild Catfish (Clarias gariepinus) in Cross Rivers State Nigeria

Chibuzor Onyinye Okonkwo, Eridiong Onyenweaku, Jombo Okey Uwujibha

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2020/v8i230133

Aim: Aquafarming of catfish has become very popular in Nigeria recently, raising concerns about the nutritional benefits of this fish to consumers especially when compared to the wild catfish.

Study Design: Fishes were obtained from Calabar Cross Rivers State Nigeria. A total of 30 catfishes were harvested, 15 aquacultured and 15 wild. The fishes weighed between 150 – 200 g at the time of harvest.

Place and Duration of Study: The study was carried out at the central laboratory of the University of Calabar, Nigeria and lasted for a period of 6 months.

Methodology: Fishes were cleaned and dried under the sun for a period of 14 days. Dried fishes were eventually ground into fine powder which was used for the nutrient analysis. The proximate, mineral and vitamin contents of aquacultured and wild catfish were investigated. The results revealed that aquacultured catfish contained significantly higher amounts of protein than the wild catfish.

Conclusion: While the aquacultured fish may be preferable for children, young adults and pregnant women who require a lot of protein for body-building, growth and development, the wild catfish may be more suitable for the maintenance of general health, water and electrolyte balance and optimum productivity being richer in most minerals.

Open Access Original Research Article

Protein-Based Genetic Diversity Assessment of Tilapia guineensis and Sarotherodon melanotheron Populations from South-West Nigerian Coastal Waters

E. A. Ukenye, I. Megbowon, M. M. A. Akinwale, M. A. Fowora, I. Chidume, N. C. Eze, R. O. Adeleke, C. C. Omatah

Asian Journal of Fisheries and Aquatic Research, Page 9-15
DOI: 10.9734/ajfar/2020/v8i230134

The present study was carried out to investigate the genetic differences in the Protein banding pattern of Tilapia guineensis and Sarotherodon melanotheron populations in Southwest Nigeria using Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis (SDS-PAGE). Four populations of Tilapia guineensis and three populations of Sarotherodon melanotheron from Ondo and Lagos states were considered for the study. The sarcoplasmic protein of the studied Cichlid species resolved on 12% SDS-PAGE revealed variations in their genetic diversity indices (number of alleles, shanon information index, heterozygosity and percentage polymorphism). T. guineensis had more proteins and higher genetic diversity as was revealed by the genetic diversity parameters and was found to be more polymorphic with a percentage polymorphism of 78.57% than S. melanotheron (57.14%). The two species had similarity coefficient of 0.82 indicating high genetic similarity between them. UPGMA (Unweighted Pair Group Method with Arithmetic Mean) dendrogram also revealed some level of genetic similarity between the studied populations and among the two species. Analysis of molecular variance (AMOVA) confirmed the low genetic variation among the populations of the cichlid species and demonstrated that genetic variation was mostly within populations in both species. It is established from the study that Tilapia guineensis had higher genetic diversity than Sarotherodon melanotheron and the two species are closely related. Further study involving molecular markers is encouraged to complement this finding.

Open Access Original Research Article

Growth Performance of Giant Gourami (Osphronemus goramy) Fingerlings Cultured in Circular Containers with Water Current

Rafi Satriawan, . Iskandar, B. S. Ibnu Bangkit, Walim Lili

Asian Journal of Fisheries and Aquatic Research, Page 16-24
DOI: 10.9734/ajfar/2020/v8i230135

This research aims to determine the application of different water currents in a round container that can provide the most optimal effect on the growth rate of giant gourami (Osphronemus goramy) fingerlings. The method used in this research was an experimental method using a completely randomized design (CRD), which consists of three treatments and four replicates The treatment was the use of aeration stone in a round container A (control), B (water current 0.1 m s-1 in a round container) and C (water current 0.1 m s-1 combined with a venturi in a round container). The fish size used in this research was 2-3 cm obtained from Gourami and Nilem Breeding Centre, Singaparna, West Java Province. Fish were kept in water gallons with a volume of 19 L. Each gallon contained 30 fish. The feeding rate was 5% from biomass. The feed was given three times daily. Every ten days the weight data were collected and used for adjusting the feeding rate. The water quality during the research (40 days) was observed every seven days while survival rate, absolute weight growth, daily growth rate, feed conversion ratio and feed efficiency were observed every ten days. Based on the results of the research, the best reuslt was treatment C (water current of 0.1 m s-1 combined with venturi in a round container) had the highest survival rate (SR) of 58%, absolute weight growth (3.5 g), daily growth rate (1.69%), feed conversion ratio (2.01) and feed efficiency (50%).

Open Access Original Research Article

Induced Spawning of the Fat Snook, Centropomus parallelus Poey, 1860 (Perciformes: Centropomidae), via the Application of the Gonadotropin-Releasing Hormone (GnRH)

Daniel Cortez Lara, Rodrigo Cuervo González, Eduardo Alfredo Zarza Meza

Asian Journal of Fisheries and Aquatic Research, Page 25-31
DOI: 10.9734/ajfar/2020/v8i230136

The fat snook (Centropomus parallelus), a catadromous species highly valued for human consumption, is widely distributed along the Atlantic coast of the American continent, from the United States to Brazil. In Mexico, it is common in the waters off the coastal states of the Gulf of Mexico, particularly Tamaulipas, Veracruz, Tabasco and Campeche. As it is important to ensure maturation and reproduction during cultivation under controlled conditions, given that this is inhibited in captivity, the spawning of the Centropomus parallelus was induced in the present study using a dose of gonadotropin-releasing hormone (GnRH).

Advanced gonad maturity was observed, while two females in a vitellogenic state reached final maturation with the application of a 50 μg/kg dose of the hormone and the male subjects failed to present spermiation under the application of the same dose.

Open Access Original Research Article

Haematological Response of Clarias gariepinus (Burchell, 1822) Fingerlings Reared in Fish Cum-Duck Integrated System

F. P. Asuwaju, U. A. Bello, Idris Hassana, J. O. Ogunseye

Asian Journal of Fisheries and Aquatic Research, Page 32-38
DOI: 10.9734/ajfar/2020/v8i230137

This investigation was carried out to determine the haematological response of Clarias gariepinus fingerlings reared in a Fish cum-duck integrated system. One thousand and eighty pieces fingerlings with mean initial weight (MIW) and standard length (SL) (1.8 ± 0.22g, and 5.19 ± 0.44 cm) respectively were stocked for ten (10) weeks. The haematological investigation revealed that RBC and WBC increased significantly (P<0.05) within treatments. Other haematological variations were also observed in parameters such as PCV, MCV, MCH, MCHC and Hb with significant decrease (P< 0.05) in their mean values within treatments as compared to the control. Water quality parameters such as Dissolved oxygen ad Transparency shows evidential significant different (P< 0.05), while parameters such as Temperature, Total dissolved solid (TDS), Nitrate, Phosphate, Biological oxygen demand (BOD), Turbidity and pH shows no significant difference (P> 0.05). This studies shows in conclusion, that there were variations in the haematological and water quality parameters, but it was noticed that the values recorded could not to a greater extent hurt the fish because is still within the tolerable limits as confirmed by other research evidences. More so, the level of gains outweighs the level of damages caused as compared to the economic approach.