Open Access Original Research Article

Fatty Acid Profile of Atlantic Horse Mackerel (Trachurus trachurus) oil Obtained using Different Extraction Methods

J. O. Aiyeloja, S. N. Deekae, O. M. G. Abu, O. A. Akinrotimi

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2022/v16i730392

The effect of three extraction methods which include soxhlet, gas and charcoal powered smoking kiln on extraction of oil from Trachurus trachurus were investigated. Chemical analyses of the oil was carried out to determine its quantity and quality in terms of fatty acid composition by using standard laboratory methods. The results obtained indicated that the highest oil yield (14.0%) was recorded in oil extracted with soxhlet method, while the lowest (0.93%) in oil extracted with charcoal powered kiln extraction method. Based on the fatty acid profile of the oils, there are sixteen fatty acids in all the extraction methods with stearic acid (53.62%) as the highest saturated fatty acid (SFA); oleic acid (7.05%) as the foremost monounsaturated (MUFA) and linolenic acid (23.31%) as the major polyunsaturated fatty acid (PUFA). The Soxhlet methods consistently recorded the highest oil yield, and can be used to extract oil for industrial use. While, the gas powered kiln can be used to extract oil for consumption purpose.

Open Access Original Research Article

Effeciency of Procedural Use of Hormonal Agent in Propagation of Clarias gariepinus

A. Uka, G. I. Obilo

Asian Journal of Fisheries and Aquatic Research, Page 9-14
DOI: 10.9734/ajfar/2022/v17i130393

Administration procedures of some hormones including single, double and multiple induction protocols were investigated to determine the implications of different induction process in propagation of Clarias gariepinus.  The hormones studied were ovulin, Carp pituitary extract (CPE) and gonopore.  A total of 36 Clarias gariepinus of the same age comprising 27 females and 9 males were used for the study.  Eggs produced among treatments were fertilized with pooled sperm from a total of 3 males per hormonal treatment.  Propagation was assessed by fecundity, fertilization, hatchability and larval survival.  Highest egg production was recorded at double inductions with ovulin and CPE while highest egg production was observed in single induction with gonopore.  There was significant disparity (P<0.05) in fertilization and hatchability percentages.  Best fertilization and hatching rate was recorded with ovulin at single induction (80.2%) and ovulin at multiple inductions (81.9%) respectively.  There was significant difference (P<0.05) in number of larvae realized among the treatments.  Highest larval survival was recorded with gonopore at single induction (68.1%).  Findings from the study showed that hormone type and mode of administration are important in propagation of C. gariepinus.  The study recommended double inductions in usage of Ovulin and CPE and single induction with gonopore.  Adopting best procedural technology in usage of specific hormone is necessary for mass production of Clarias gariepinus seeds.

Open Access Original Research Article

Physico-chemical Parameters and Heavy Metals Distribution in Selected Shell Fishes along the Opuro-Ama Creek in Rivers State of Nigeria

Davies I. Chris, Efekemo Oghenetekevwe

Asian Journal of Fisheries and Aquatic Research, Page 15-26
DOI: 10.9734/ajfar/2022/v17i130394

The study was conducted to determine the heavy metals concentration in selected shell fishes (U. tangeri, C. amnicola, T. fuscatus, P. monodon), sediment and water. The samples were collected from a fishing port along the Opuro-ama Creek in Rivers State of Nigeria. analysis for Manganese (Mn), Iron (Fe), Cobalt (Co) and Zinc (Zn) were done using Atomic Absorption Spectrophotometer. The order of metal accumulation in these shellfishes, sediment and water were; C. amnicola (Fe > Zn > Cu > Co > Mn); U. tangeri (Fe > Zn > Cu > Co > Mn); T. fuscatus (Fe > Cu > Zn > Co > Mn); P. monodon (Fe > Co > Zn > Cu = Mn); Sediment (Fe > Zn > Co > Cu > Mn); Water (Fe > Cu > Mn > Co = Zn). There was statistical difference (p<0.05) in metals concentration in the soft tissues in all the shellfish. From the results, the concentration of the metals in the tissues of all the shell fishes, the interstitial water and the sediment sampled from the creek were within the permissible limit recommended by the Department of Petroleum Resources (DRP), Environmental Protection Agency (EPA) and World Health Organization (WHO) except for Fe which was above the recommended limit. The physicochemical parameters of the interstitial water such as pH, Temperature, Conductivity, Total Dissolved Solids (TSS) Biological Oxygen Demand (BOD), Dissolved Oxygen (DO), and Salinity were within the acceptable levels in the guidelines for drinking]. Although Chemical Oxygen Demand (COD) and the Total Suspended Solids (TSS) were slightly higher than the recommended limit of these metals by Department of Petroleum Resources (DRP). This indicates that if theses metals are not checked, they may increase the potential for bioaccumulation in the shellfishes and the creek as well. Therefore, there is need for regular monitoring of this creek to avoid future deterioration.

Open Access Original Research Article

EPA, DHA, ADG and FCR in Biofloc Catfish for Improving the Quality of the Nutrient with Fish Oil Administration

Elvida Usman, Rita Rostika, Fittrie Meylianawaty Pratiwy, Kiki Haetami

Asian Journal of Fisheries and Aquatic Research, Page 27-34
DOI: 10.9734/ajfar/2022/v17i130395

This research aims to determine the right dose of fish oil so that it has a good effect on the growth of catfish (Clarias sp.) biofloc as seen from the content of Omega-3 (EPA and DHA), daily average weight gain (ADG) and ratio ratio. feed (FCR). The research was carried out in September and October 2021 at the Ciparanje Green House, Padjadjaran University. The method used is an experimental method using a completely randomized design (CRD) consisting of four treatments with four replications with different levels of fish oil administration, namely 0% (A) as control, 2% (B), 4% (C), and 6%. (D). The fish used is Clarias sp. Fish cultivation from cultivators in Cileunyi village as many as 240 fish weighing 20.04 grams and an average length of 14 cm were randomly placed into 16 fiber tanks based on treatment, while each tank was filled with 15 fish. The size of the fiber tub used was 68 x 68 x 68 cm3 as a cultivation container. The feed given is commercial pellets with the trademark Hi-Provite 781. Fish oil used is fish oil. Parameters observed included omega-3 content, ADG, FCR, and water quality. The results showed that the optimum application of fish oil in increasing the value of EPA content was 36 mg/100g and DHA was 148.5 mg/100 g, the highest ADG value was 0.45%, and the best FCR value was 1.2 and water quality. which is still within the recommended limits in aquaculture using biofloc, provides evidence that the application of fish oil in biofloc aquaculture can improve the nutritional quality of catfish.

Open Access Review Article

Mangrove-epiphytic Plants in Selected Mangrove Rehabilitation Areas of Davao Occidental, The Philippines

John Paul R. Pacyao, Marlyn B. Llameg, John Christopher O. Jondonero

Asian Journal of Fisheries and Aquatic Research, Page 35-42
DOI: 10.9734/ajfar/2022/v17i130396

The study was conducted in the mangrove rehabilitation sites of Malita, Davao Occidental, Philippines particularly Sitio Agdao of Brgy. Tubalan, Sitio Baybay of Brgy. Buhangin and Sitio Lahusan of Brgy. Fishing Village from October to December 2020. Preliminary stations were established: Station 1 in Sitio Agdao, Station 2 in Sitio Baybay and the Station 3 in Sitio Lahusan. These sites are considered to be a slightly undisturbed mangrove forest dominated by species of mangrove trees.

The free exploration method was carried out first before the conduct of the study. Samples consisted of host plants and their associates (epiphytes) are collected for proper identification. Three study areas were assessed by the number of individual species to calculate their relative abundance and density.

A total of 7 species identified individually among of the three-study areas. The study also shows that species of mangrove epiphytes in the study area composed of 3 to 5 species per station and exhibit 1 to 3 identified species per plot and individual species per station revealed that Davalia denticulata and Aglaomorpha quercifold were the most common species of mangrove epiphytic plants in almost all three study areas. However, Lahusan sampling station occurred numerous quantities of Mangrove epiphytic plants species among 3 identified study areas including Imprerata cycindrica that cannot be found in Agdao and Baybay Stations.

Statistically, no significant difference was observed among study areas.