Open Access Original Research Article

Toxicity Effects of Brown Dried Pawpaw (Carica papaya) Leaf Extract to Fingerlings of African Catfish Clarias gariepinus

A. H. Ishaku, A. I. Jauro, Y. M. Gadaka, A. Yagana, R. A. Mohammed, S. Usman, W. Chinda

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2019/v4i330055

The acute and sub-lethal bioassay of aqueous extract of fresh pawpaw (Carica papaya) leaf on Clarias gariepinus fingerlings was investigated. The experiment was carried out at Department of Fisheries Teaching and Research Fish Farm, Modibbo Adama University of Technology Yola. At 96h static bioassay, symptoms of toxicity in the fish indicated that aqueous extract of fresh pawpaw leaf caused sub-acute effects such as altering fish behavior. These behaviors include air gulping, erratic swimming, discoloration, loss of reflex and skin peeling. These behavioral alterations were time and concentration dependent. Exposure to aqueous extract of fresh pawpaw leaf caused decrease in packed cells volume (PCV), haemoglobin (Hb), and red blood cell (RBC), mean corpuscular haemoglobin concentration (MCHC) and an increase in the mean corpuscular haemoglobin (MCH) and mean corpuscular volume (MCV). It resulted in marked increase in white blood cells (WBC). Mortalities and LC50-96h values for Clarias gariepinus exposed to fresh pawpaw leaf extract was (10.9 ml/l). The mortality rates in extracts to Clarias gariepinus in sub-lethal exposure was lower than in acute concentrations. The growth rates were significantly reduced in fish exposed to sub-lethal concentrations of the fresh pawpaw leaf extract compared to the control fish (p<0.05).

Open Access Original Research Article

Water Quality Distribution in Situ Gunung Putri Bogor Regency, Indonesia

Zahidah Hasan, Thoriq Ilham, Yuli Andriani, Heti Herawati, Fachmijany Sulawesty

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2019/v4i330056

The purpose of this study was to determine water quality distribution in Situ Gunung Putri. This research was conducted from February to March 2019, carried out in Situ Gunung Putri and at the Limnology Research Center of the Indonesian Institute of Sciences, both located in Bogor, West Java. The method used was the survey method. The results showed that, at the surface level, the temperature ranged between (28.14±0.52 and 30.61±1.76)°C, transparency between (0.38±0.12 and 0.65±0.06) m, dissolved oxygen (DO) was between 1.92±1.10 and 5.7± 2.55 mg / L, chemical oxygen demand (COD) was between 42.22±9.86 and 54.09±15.89, nitrate between (0.047±0.009 and 0.05±0.015) mg / L, phosphate of (0.015±0.002 and 0.022± 0.004) mg / L and pH was between 7.11± 0.27 and 7.33 ±0.34. Meanwhile at the Secchi depth values of the temperature ranged between (2.93±0.71 and 29.96 ±1.71)°C, DO was 1.14 ±0.90 and 3.37±1.63  mg / L, nitrate was 0.045±0.008 and 0.056±0.019 mg / L, phosphate was 0.016±0.003 and 0.035± 0.043 mg / L and pH was between 6.68± 0.33 and 7.11 ±0.28.  Based on these values water quality parameters except COD in  Situ Gunung Putri is still at the optimal range  for aquatic organisms.

Open Access Original Research Article

Structure of Macrozoobenthos (Gastropods) Community in Mangrove Forest Ecotourism Pandansari Kabupaten Brebes, Central Java

Natasya Natalia Sinaga, Heti Herawati, Herman Hamdani, Asep Sahidin

Asian Journal of Fisheries and Aquatic Research, Page 1-6
DOI: 10.9734/ajfar/2019/v4i330057

Aims: This research aimed to analyze the abudance and diversity of macrozoobenthos in the Gastropod Class in the Ecotourism Waters of Pandansari Mangrove Forest, Brebes Regency, Central Java.

Study Design: The research was conducted by survey.

Place and Duration of Study: This research was carried out for 3 months between December 2018 until February 2019 in Ecotourism Forest Areas in Bakau Pandansari, Brebes Regency, Central Java.

Methodology: The method used in this research was survey methods using primary data in the form of physical chemistry of aquatic data, gastropod abundance, diversity index, equitability index. Data collection techniques using purposive sampling in determining 3 stations and 3 repetitions. Data analysis in this research used descriptive statistics.

Results: Research results found 9 species of Gastropods inhabiting the mangrove ecosystem, namely Casidulla aurisfelis, Cerithidea sp, Cerithidea alata, Cerithidea cingulata, Cerithidea obtusa, Polinices sp, Puperita sp, Telescopium telescopium and Turiculla nellial-suprius. Gastropod abundance ranged from 67 - 166 ind / m2. Gastropod diversity index in the medium category 2 <H’ ≤ 3. Uniformity values ranged from 0.79 to 0.81 with a high category. The relationship between water quality and gastropods had an R2 value of 97%, water quality can affect gastropod life and as much as 3% is influenced by other factors.

Conclusion: Based on the results of this research that has been done, it can be concluded that in general environmental parameters in the Pandansari mangroves are still favorable in supporting the survival of the gastropods inhabiting them.

Open Access Original Research Article

Characteristics and Structure of Freshwater Fish Farmers in Ghana: A Socio-economic Analysis

Hayford Agbekpornu, Doris Yeboah, Matthew Oyih, Seth Koranteng Agyakwah

Asian Journal of Fisheries and Aquatic Research, Page 1-15
DOI: 10.9734/ajfar/2019/v4i330058

This Study was undertaken in all the ten (10) administrative regions of Ghana with the aim of examining freshwater fish farmers’ characteristics and structure. Socio-economic status showing characteristics and structure are relevant and contribute towards the designing of more realistic people centered rural development programs in relation to high returns on projects and programmes.

Data was collected in 2016 using a semi-structured questionnaire, loaded unto an online data collection software (Kobo Toolbox) and configured on a tablet.

Results showed that the industry is male dominated. A greater percentage of the male and female respondents were in their productive years (36-65 years), highly educated (tertiary level) and married. The main occupation of most fish farmers is agriculture with an average household size  of 6.

A higher percentage of both sexes had none of their children involved in aquaculture. Average fish farming experience for males and females was 6 and 5 years respectively with a range of 1 to 10 years. Main production systems is pond followed by cages and the key cultured species is tilapia (Oriochromis Niloticus) with the others being catfish (Clarias gariepinus), heterotis (Heterotis niloticus) and snakehead (Barachana obscurus). A greater percentage of the respondents were involved in monoculture system. Both male and female fish farmers practiced mainly semi-intensive system for pond culture followed by intensive system of farming mainly for cage culture. The number of production cycle is mainly 1 followed by 2 in a year. Sampled farmers practiced semi-intensive, intensive and extensive systems of farming and the three main land ownership categories accessed by fish farmers were outright purchased, freehold and leasehold.

Main source of funding for fish farming is self for both sexes. Both accessed their fingerlings mainly from the private sector. A greater percentage procure fish feed from local source while the three main sources of water for fish farming were rivers, streams and boreholes.

Open Access Review Article

A Short Review on the Halotolerant Green Microalga Asteromonas gracilis Artari with Emphasis on Its Uses

George N. Hotos

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2019/v4i330054

The halotolerant green single-celled Asteromonas gracilis isolated from the hypersaline saltern ponds of Messolonghi, Greece, was kept in laboratory cultures, grown effectively at various salinities and used for feeding rotifers, protozoa, copepods and Artemia sp. In all feeding trials all filter feeders accepted A. gracilis and grew. Additionally, as of its morphology, movement and culture reliability Asteromonas is a valuable teaching tool for phycological studies, supreme to the other usual microalgae for this purpose. The exploitation potential of A. gracilis in many sectors awaits research results, as literature data are scarce.