Research Article
May 28, 2021
Differences in Phenotypic Characters of Nile Tilapia (Oreochromis niloticus L).
Nile tilapia (Oreochromis niloticus L.) is indigenous species to Ethiopia and constitutes major proportion in the country’s fish production. In an attempt to select better performing strains for aquaculture development, tilapia populations from different Ethiopian rift valley lakes showed different growth performances in pond culture. Investigation of desired culture characteristics of target tilapia populations is required to improve their productivity in aquaculture system. The current study was made to investigate phenotypic characters of the tilapia populations in three geographically isolated Ethiopian rift valley lakes (Chamo, Koka and Ziway). A total of 450 adult tilapias of commercial catches were sampled from the three lakes and their phenotypic characters were analyzed during May 2018 to March 2019. Twenty six morphometric character indices, eight meristic counts, total length, standard length, total weight, length-weight relationship and Fulton’s condition factor were considered in the analysis. The results revealed significant differences (p ≤ 0.05) in most of the morphometric character indices, meristic counts, mean length and weight and Fulton’s condition factor among the three tilapia populations. Chamo tilapia population were found to have highest mean values of total weight, total length and standard length while Koka population have highest mean value of Fulton’s condition factor and positive allometric growth as characters desired in aquaculture. Further research is required to investigate whether the fish populations could maintain those characters in pond cultures.
Editorial
May 27, 2021
Fishing Technology and Methods.
Not applicable.
Research Article
May 24, 2021
Ichthyofaunal Diversity in the Wetlands and the Living Status, Biodiversity Assessment and Fishing M ... ethods.
Aquatic biodiversity and fish wealth of Kerala sustain more than 10 lakh fisher folk and supports numerous additional activities including commercial fishing, tourism, aquaculture, education, recreation etc. Species diversity, gear and craft specifications, seasonal variation of fish caught and living status and related problem accessment studies were conducted in Vembanad Lake at Varapuzha wetlands of Ernakulam district in Kerala during January 2020 to March 2021. Etroplus maculatus, E. suratensis, Stolephorus indicus, Ambassis ambassis were found to be highly abundant speciesin the research area. Out of 3105798(as per 2001; Department of Town and Country Planning, Kerala) people in Ernakulam district, percentage population involved in different types livelihood sectors were identified and recorded. Case study was conducted to understand the problems in the sector and appropriate recommendations were given.The recorded data showed that Varapuzha Lake is rich in biodiversity with a diversified range and floras and faunas.
Research Article
May 24, 2021
Design Characteristics and Specifications of Cast Net.
Cast net (Locally called veesu vala) design variation, operational techniques, catch composition and selectivity analysis in vembanad wetland, Kerala was examined between June 2020 to April 2021. Netting materials used for cast net construction in vembanad Lake were monofilament, multifilament Nylon (polyamide). The cast net length was 4-5 m and net mouth area was 2.5-5.0 m . Cast net was somewhat species specific and showed selectivity for shallow water species. Its durability ranged from 3.5 months to 3 years depending on the netting material and the environmental conditions where it is being operated. Cast net fishery is one of the main type of artisanal fishery practiced occupationally by the fishermen community of Kerala. The region so far is untouched with the introduction of mechanized fishing apart from small traditionalized improvements. The cast net was used to catch the fishes of marketable size, small fingerlings which were either used as bait or dried.
Research Article
Apr 26, 2021
It is a research analysis of the Phenotypic Variability of Sampled Clarias gariepinus (Burchell, 182 ... 2) Population from Selected Sources of Benue and Donga River, Nigeria.
Phenotypic variability of sampled Clarias gariepinus (Burchell, 1822) population from Benue and Donga River, Nigeria, was assessed. Thirty matured samples of Clarias gariepinus of different sizes were bought from artisanal fisherfolk, and morphometric and meristic attributes were characterized. Phenotypic heterogeneity (coefficient of variability, CV, > 10%) and multiple modes in meristic and morphometric values were assessed to imply plasticity and taxonomic complications, respectively. Twenty morphometric and nine meristic attributes were measured in all the collected individuals to the nearest 0.01 cm, using Vernier calipers. Coefficient of variability of the Benue population varied from 8.36 in dorsal fin rays counts (DFR) to 46.33 in possession of anteriorly serrated spine on the right side (PESES-R), while that of the Donga populations varied from 6.77 in caudal fin rays count (CFR) to 61.76 in possession of anteriorly serrated spine on the left side (PESES-L). A total of 88.8% of meristic attributes of the Benue strains were heterogeneous (CV > 10%), while 29.6% of Donga strains were heterogeneous (CV > 10%). A total of 94.1% and 58.8% of morphometric attributes of Benue and Donga populations, respectively, were heterogeneous (CV > 10%). Multiple modes were recorded in both Benue and Donga populations at 58.8% and 52.9% of the attributes, respectively. Pectoral fin length of left side fin (PECFL-L) and maximum body depth (BD-MAX) were the most varied morphometric attributes in the Benue population, while caudal fin width (CFW) and pectoral spine length of left side fin (PECSL-L) were most varied in the Donga population. The Benue population had significantly higher values at head length (HL), BD-MAX, dorsal fin length (DFL), anal fin length (AFL), pre-pectoral (PPEL), and pre-pelvic (PPL), when compared with Donga population, while Donga population had significantly higher values at CFW, pre-dorsal (PDL), and pre-anal (PAL) when compared with Benue population. The studied C. gariepinus population was characterized by heterogeneity of phenotypic values, and the population can be taxonomically discriminated by meristic and morpho types.
Miscellaneous
Apr 26, 2021
Save the date Aquaculture 2021 will be arriving!
Aquaculture 2021 aims to bring all the life science professionals for our Aquaculture Meetings to interact and share their knowledge and their newest research to the entire aqua streams Also this time, our conference will focus on International Fisheries, Associations, and Organizations.
Miscellaneous
Apr 23, 2021
Award of Aquaculture
The Aqua 2020 Committee is pleased to welcome participants from all over the world to the prestigious Global Summit on Aquaculture & Fisheries scheduled to take place in Spain on 7 October 2020 with the main theme "Advancing towards an Environment-Resistant Aquaculture." The conference will provide a global coliseum for international scholars and researchers to share their research findings with the world. It is accepted that good water quality to maintain viable aquaculture production is needed within the growing aquaculture industry.
Miscellaneous
Apr 20, 2021
A brief Market Analysis for Fisheries in Europe for 2020.
From olden days, fishing from lakes, rivers and oceans has been a major source of food, provider of employment and other economic benefits for humanity. Aquaculture is counted be probably the fastest growing food-producing sector in the world currently. The growing concern and awareness about the health advantages and nutritional value associated with seafood surge its consumption. Also, rising demand for fish oil in various industries like healthcare, pharmaceuticals, food and dietarys supplements among others further contribute to the market growth significantly. The combined result of the growth of aquaculture worldwide and the expansion in world population is that the average annual per capita supply of food fish for human consumption has grown ten times in the past 2 decades.
Miscellaneous
Apr 16, 2021
9th International Conference on Aquaculture & Fisheries schedule on October 07-08, 2021 at Vienna, A ... ustria.
Conference Series LLC fosters research excellence and leadership by recognizing the outstanding researchers, exceptional graduates or early academicians who have distinctive enthrallment towards the conference themes. Nominees are judged on past accomplishments, research excellence and outstanding academic achievements. Researchers throughout the world who have been credited with outstanding achievements can make a significant contribution to the advancement of their field, thereby having a positive influence on the society.
Research Article
Apr 09, 2021
A research analysis of the Maximum Likelihood Estimation of Kokanee and Sockeye Salmon Spawners in a ... Stream Using Visual Survey Data, 2003-2017.
A Maximum Likelihood estimation procedure was developed for the joint assessment of resident kokanee and anadromous sockeye salmon in the Okanagan River, British Columbia. The model uses visual survey counts and is an extension of other areaunder- the type models used for estimation of salmon escapement. Alternative hypotheses were tried concerning observation error structure, arrival times, and survival patterns for a common observer efficiency estimate. The final model is described here, with information on setting bounds and constraints for parameter estimation, comparisons made and the results obtained. Estimates of abundance and approximate confidence intervals are comparable to those obtained from other investigations. Since 2001, Sockeye accounted from 6%-38% of the spawners, with no evidence from surveys and estimates to indicate kokanee are negatively impacted Sockeye, perhaps because of the estimated spatio-temporal segregation pattern. Recommendations are made concerning future adjustments and surveys for systems with two Nerkids that cannot always be readily distinguished in visual surveys. The results obtained are important to justify continued efforts to re-introduce Sockeye into Canada, maintain hatchery production to supplement Columbia River Sockeye fisheries, and protect existing biodiversity in this multi-species ecosystem. Management implications for the Columbia River fisheries in the US and Canada are discussed.
Editorial
Mar 30, 2021
An editor's note on Litopenaeus Vannamei Feeding Activity and Development on Soybean Based Diets wit ... h Added Feeding Effectors.
Fish is an important human food source that provides essential nutrients while also contributing to global food security. Approximately 90% of global aquaculture production is concentrated in the Asia-Pacific region, with China, India, and Indonesia as the top producers. With the production of high- value fish destined for export, fish farming in developing countries provides domestic food security and supports rural livelihoods. More than 3 billion people rely on marine and coastal biodiversity for their livelihoods, according to the United Nations. Acidic ocean environments impede fish growth by limiting their ability to calcify bones, as well as increasing the metabolic cost of life and thus the amount of gases that must be carried across the gills. Regrettably, we know very little about the effects of warm acidic conditions on important fish species. Regrettably, we know very little about the effects of warm acidic conditions on important fish species. As a result, research into the combined effects of ocean warming and acidification on marine fish growth is needed, as well as estimates of the ecological and economic costs to wild fish populations (fisheries) and marine fish farming.
Editorial
Mar 30, 2021
An editor's note on the Probiotic Effect on Feeding Technology and their Use in Aquaculture.
A probiotic is a beneficial microorganism that protects the host animal from pathogens, either directly or indirectly. Antimicrobial medicines, pesticides, and disinfectants used in aquatic disease control and high production growth are becoming increasingly resistant to bacterial pathogens. As a result, probiotics research in aquaculture is becoming increasingly popular as a means of ensuring environmentally friendly, long-term aquaculture without the use of antibiotics. The benefits of probiotics include increased feed value, enzymatic stimulation in the digestive system, pathogen reversal, anti-mutagenic activity, and improved immune response. Probiotics in the gut microbiota of marine animals have not been properly studied, and their environmental impact has not been widely considered. Further research into the effect on enzyme activity related to the fish metabolism system is needed. The use of probiotics in fish, as well as their biosecurity, should be thoroughly investigated. The farmer should have a basic understanding of the probiotic organism and exercise caution when applying it to the culture field.
Research Article
Mar 17, 2021
A research analysis of the Present Status and Future Direction of Bangladeshi Shrimp Resources.
The fisheries sector of Bangladesh represents one of the most dynamic food-producing sectors with the largest flooded wetland and the 3rd largest aquatic biodiversity in Asia after China and India. This paper presents the performance of shrimp production a fisheries sub-sector in Bangladesh using data collected from the Department of Fisheries (DoF), and related field level information. The findings describe the recent status of shrimp production and its economic contribution as an aquaculture sub-sector (2017-2018). This study suggests that standard operating procedure is the prerequisite for shrimp culture along with the scientific and technical development. From 2010 to 2018, though frozen shrimp products export decreased from 51,599 MT to 36,167.77 MT the total value increased $340.48 million to $416.22 million respectively. From the last 10 years shrimp production has been increased gradually and 2017-2018 it has increased by 3.23% than 2015-2016. Therefore, there is a considerable potentiality for increasing export earnings from shrimp products in the future but for this, the present deficiencies should be well addressed and industries should positively respond to the demand of the global market. Additionally, our study will help to get a clear picture and valuable information about shrimp production in Bangladesh which is important for shrimp farming and catch-up the trade market.
Review Article
Mar 02, 2021
A review of the Fishery Resources, Conservation Challenges and Management Strategies in Ethiopia.
The purpose of this review article is to explore the fishery resources, potentials, conservation challenges, and management strategies of Ethiopian water bodies. Ethiopia is one of the landlocked countries in the horn of Africa characterized with a wide range of ecological, geographical, edaphic, and climatic conditions that account for a wide diversity of its biological resources both in terms of flora and fauna. It has a high diversity of Ichthyologic Fauna, accounts for over 200 fish species. In average, the production potential yield of Ethiopia is accounted for 94,500 tons per annum in different water bodies. However, the actual production is 38,370, still far below the estimated potential yield. The main factors contributed to low production of fish including illegal fishing activities, lack of awareness, overfishing, wetland degradation, deforestation, invasive species, lack of infrastructure, and technologies. Capacity building towards aquatic policies, legislation and regulation, community empowerment, pollution control, invasive alien species control, threatened species conservation, integrated watershed management plan, illegal fishing, area and seasonal closure, and public awareness creation is needed to save the water bodies and to increase fishery production.
Research Article
Feb 26, 2021
It is a research study focusing on Population Dynamics of Ilisha africana in Coastal Waters of Ghana ... .
The present study was aimed to estimate population parameters including asymptotic length (L∞), growth rate (K), growth performance index (Φ′), natural mortality rate (M), fishing mortality rate (F), exploitation rate (E), and maximum exploitation rate (Emax) of Ilisha africana in coastal waters of Ghana for effective management measures and utilization using FiSAT. Of the total 804 specimens, asymptotic length, growth rate, and growth performance index were 23.6 cm, 0.48 per year, and 2.428, respectively. The total mortality rate (Z), natural mortality rate, and fishing mortality rate were 1.47 per year, 1.13 per year, and 0.34 per year, respectively. The exploitation rate (E) and maximum exploitation rate (Emax) were 0.23 and 0.56, respectively, indicating low exploitation rate of I. africana stocks in Ghanaian coastal waters. The induction of recruits into the stock of I. africana species was all year round, suggesting no recruitment for the assessed fish species. Although the exploitation of the assessed fish species was optimum, there is the need to ensure continuous monitoring of fishing effort and adherence to mesh size regulations in order to sustain the fishery.
