Open Access Original Research Article

Performance of Lettuce and Water Spinach in Koi Fish-based Aquaponics System

Yuli Andriani, Zahidah ., Yayat Dhahiyat, Herman Hamdani, dan Ristiana Dewi

Asian Journal of Fisheries and Aquatic Research, Page 1-7
DOI: 10.9734/ajfar/2019/v3i430039

This research aims to determine the growth of lettuce and water spinach plants used as biofilter in koi fish (Cyprinus carpio) aquaponic system. Research was carried out at the Laboratory of Fisheries, Ciparanje, Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran from March to April 2018. Research was carried out experimentally using Randomized Block Design (RBD) with 2 treatments and 6 repetitions. The treatments were a combination of koi and  water spinach, and a combination of koi and lettuce. The parameters observed were fish growth, fish survival, increase in length of plant stems and increase in leaf strands. The combination of koi fish and water spinach plants produced the highest productivity of plants, with stem length of 39 cm and the addition of 15 leaflets. This combination also produced the highest absolute growth of 3.93 grams / fish and survival rate of 100%.

Open Access Original Research Article

Stomach Content, Length-weight Relationship and Condition Factor of Tilapia spp. found in the Sombreiro River across Three Communities in Rivers State, Nigeria

E. O. Horsfall, G. M. Sokari, M. Moslen, I. K. E. Ekweozor

Asian Journal of Fisheries and Aquatic Research, Page 1-14
DOI: 10.9734/ajfar/2019/v3i430040

Aim: The present study aims to determine the condition factor incomplete of Tilapia guineensis and Sarotherodon melanotheron in Sombreiro River across Buguma, Abonnema and Degema communities in Rivers State.

Study Design: This study employs fieldwork, laboratory experimental design, statistical analysis and interpretation of data.

Place and Duration of Study: Live fish samples were caught by fishermen in Buguma, Abonnema and Degema communities in Kalabari kingdom of Rivers State, and were conveyed in a rectangular plastic aquarium containing ice blocks and oxygen bags to the department of Applied and Environmental Biology, Rivers State University. The duration of the study lasted for twelve weeks (65 days).

Methodology: One hundred and eighty fish samples give their average weights and lengths were identified. The fish samples were weighed using an electronic weighing balance, the total length and length of intestine were measured with a meter rule (cm), color of fish, spines and rays of fish were also observed. Their stomach contents were analyzed viewing under a microscope. The frequency of occurrence method and the numerical method were used for analyzing the food items.

Results: The stomach content analysis indicated that the major food was phytoplankton. The length and weight relationship in the three sampled stations for T. guineensis and Sarotherodon melanotheron showed negative allometric growth, (<3).  The condition factor for all the fish samples was greater than one. The physicochemical parameters showed that there were significant differences in the various physicochemical parameters across the study stations except for turbidity (P=0.744) and salinity (P=0.922), that showed no significant difference across the study stations.

Conclusion: The length-weight relationship in fishes can be affected by a number of factors including season, habitat, gonad maturity, sex, diet, stomach fullness, health and differences in length ranges of the specimen caught. The exact relationship between length and weight differs among species of fish according to their inherited body shape, and within a species according to the condition (robustness) of individual fish.

The stomach content analysis of the sampled fishes provided a baseline study of food and feeding habits of Tilapia species in the sampled stations.

Open Access Original Research Article

Gonad Histology, Proximate Composition and Growth Efficiency of Nile Tilapia Fed with Pawpaw (Carica papaya) Seeds Powder

Jerusha Njeri Waweru, Phillip Okoth Raburu, Elizabeth Akinyi Odhiambo

Asian Journal of Fisheries and Aquatic Research, Page 1-9
DOI: 10.9734/ajfar/2019/v3i430041

The study was carried out to determine the effect of different inclusion levels of pawpaw seeds powder (PSP) on the proximate composition, growth and histological structure of Nile tilapia gonads.  Nile tilapia were treated with pawpaw seeds powder at four levels at 0 g, 4 g, 8 g and 12 g PSP/kg feed for 60 days. The proximate composition of the carcass of the  Nile tilapia showed that the 8 g PSP/kg feed treatment group had the highest values (mean ± SE) of Crude protein  and ash (53.97 ± 0.094 and 20.05 ± 0.35) respectively. The highest body weight gain and specific growth rate was achieved at the 8 g PSP/kg treatment level but this treatment level showed the lowest feed conversion ratio. Histology of gonads of Nile tilapia treated with different levels of PSP revealed that ovaries and testes of 0 g PSP/kg feed were normal. Ovaries of the 4 g PSP/kg feed had degenerative stromas while testes had scanty spermatozoa. At 8 g PSP/kg feed, the ovaries showed increased atretic follicles and testes had degeneration of spermatozoa.Treatment with 12 g PSP/kg feed resulted in severe atretic follicles of the ovaries and deformation of seminiferous tubules and erosion of spermatozoa of the testes. The results of this study showed that pawpaw seeds powder can be used to control the breeding of Nile tilapia in production units.

Open Access Original Research Article

Effect of Different Doses of Ovulin Hormone Suspended in Saline on the Induced Breeding Performance of African Catfishes Clarias anguillaris and Clarias gariepinus in Sokoto, Nigeria

H. F. Maradun, L. A. Argungu, M. Y. Abubakar, M. Y. Abubakar, F. Umar, L. I. Kasim, A. M. Sahabi

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2019/v3i430042

A study on the effect of different doses of Ovulin hormone suspended in saline on the breeding performance of Clarias anguillaris and Clarias gariepinus was carried out. The experiment was conducted in a 2x5 factorial experiment in a Completely Randomized Design at the Hatchery Unit of the Department of Fisheries and Aquaculture, Usmanu Danfodiyo University, Sokoto. Species and hormone dilutions constituted the factors with specie having 2 levels (C. anguillaris and C. gariepinus) and Ovulin suspended in saline at 5 levels (0%, 25%, 50%, 75% and 100%). The result showed that species levels did not significantly (P>0.05) affect the breeding performance in all the breeding performance parameters observed. However, fertilization rate, hatching rate and survival rate were significantly affected (P<0.05) by different levels of Ovulin suspended in saline, but did not have significant influence (P>0.05) on egg weight, spawning fecundity and relative fecundity. It could be concluded from this study that Ovulin suspended in saline can have significant influence on the breeding performance of African catfish.

Open Access Review Article

Marker-assisted Selection in Fish: A Review

F. Eze

Asian Journal of Fisheries and Aquatic Research, Page 1-11
DOI: 10.9734/ajfar/2019/v3i430038

The important economical traits like body growth, resistance to diseases, meat quality, etc. highly influence the profitability of food animals including fishes. The main target of every selective breeding programme is to produce improved traits offspring’s. However, improvement of performance traits through traditional phenotype-based selection needs several generations to optimise these characters. Marker-Assisted Selection (MAS) is a type of indirect method of selection of better performing breeding individuals. MAS is beneficial when the traits are difficult, expensive to measure and has both low heritability and recessive traits. MAS facilitates the exploitation of existing genetic diversity in breeding populations and can be used to improve desirable traits in livestock. MAS depends on identifying the link between a genetic marker and Quantitative Traits Loci (QTL). The distance between marker and target traits determines the association of the marker with the QTL. After identifying the markers linked to QTL, they can be used in the selective breeding programme to select the brooders having better genetic potential for the targeted trait. Improvement of performance traits through MAS is fast and more accurate and allows us to understand the genetic mechanism affecting performance traits.