EISSN : 2618-6365
Published by: Scientific Web Journals (SWJ) (10.3153)
Total articles ≅ 90
Latest articles in this journal
Aquatic Research, Volume 4, pp 299-303; https://doi.org/10.3153/ar21024
Caenis nigropuctatula Malzacher, 2015, a new mayfly record of the fauna of Indian Ephemeroptera, is recorded from the Vaigai River, Tamil Nadu, India. It is known before from Thailand, Java, and Sumatra. The distribution map of C. nigropuctatula is given.
Aquatic Research, Volume 4, pp 208-213; https://doi.org/10.3153/ar21016
The cryptic gastropod Alva-nia scuderii Villari, 2017, recently described from the Strait of Messina as new species inside the A. scabra (Philippi, 1844) group, was known by restricted areas of eastern and southern Sicily. Some records from the type locality and south-eastern Tyrrhenian sea, which pro-vided new data on habitat and bathymetric range, also enlarged northward, in a further basin, the known ar-eal. Such areal, that over-laps a Mediterranean west-ern-eastern biogeographic boundary, may be consid-ered a further clue of an hy-drological front that is re-sponsible of a West-Mediterranean footprint more marked than in nearby North-westernmost areas.
Aquatic Research, Volume 4, pp 21-37; https://doi.org/10.3153/ar21003
The main objective of this study was to evaluate the community structure of the order Ephemeroptera in the Southern Western Ghats ecoregion along with Principal Component Analysis (PCA) and Canonical Correspondence Analysis (CCA) from 2017 to 2018. Ecological parameters estimated at each collecting site were pH, dissolved oxygen, biological oxygen demand, hardness and alkalinity. This research investigation was carried out in 30 streams of Palni and Cardamom hills in Western Ghats of Southern India. With PCA examination, the sites like Dhobikana, Fern hill and Poomparai of Palni hills are plotted far apart and are not supported by the ecological parameters like in the other sites. Dhobikana of Palni hills is exceptionally contaminated in light of the fact that dhobis are associated with washing garments so cleanser contamination is prevalent around there. In cardamom hills, Santhamparai near bridge and Nayamakkadu are left far apart indicating they are not supported by physico-chemical parameters, mainly due to pollution. From to the CCA results, it is discovered that Baetis species favor β-mesosaprobic habitat and Indialis badia inclines toward high altitudinal region. From the outcomes, it is presumed that pH, dissolved oxygen, biological oxygen demand, hardness and alkalinity were the essential components administering the mayfly community and structure.
Aquatic Research, Volume 4, pp 343-350; https://doi.org/10.3153/ar21029
The Laguna Ojo de Liebre (Scammon’s lagoon) is the iconic sanctuary of the Pacific gray whale and belongs to the El Vizcaino Biosphere Reserve in Baja California, México. From June 2015 to August 2016, six seasonal visits were conducted on the ichthyofauna in seven sites of the lagoon. By diving, trapping, hook & line, and gillnet commercial fishing, a total number of 39 fish species was identified belonging to 25 families. In this study a total number of eight fish species is added to the first two existing 20-year-old lists: the Gymnothorax mordax (Ayres, 1859), Apogon sp. Pomacanthus zonipectus (Gill, 1862), Balistes polylepis (Steindachner, 1876), Pareques viola (Gilbert 1898), Caranx sp., Sphoeroides lobatus (Steindachner, 1870), and the Icelinus sp. During 2015-2016, two anomalous events warmed the lagoon, and possibly, it contributed to the fish species movement from the adjacent tropical or subtropical zones. Ichthyofauna from Laguna Ojo de Liebre is reported here before the installation of reef modules as a refuge for red lobster and fish aggregation.
Aquatic Research, Volume 4, pp 313-320; https://doi.org/10.3153/ar21026
As the human population increases, freshwater fish has become an important alternative source of protein to meet the need of protein. Especially numerous fish species from the family Cyprinidae are consumed by the people. Among these fish, Carasobarbus luteus (Heckel, 1843) is also one of the most preferred species thanks to its edible flesh as well as its low price. Since it is economically important, there has been the pressure of overfishing and invasive species on the populations of this species, resulting in decrease of the sources day by day. Management and conservation of the species have importance therefore it is need to know its genetic variations in the first place. The present study analyzed sequences of mtDNA cyt b locus and established the genetic variability following the collection of 65 individuals from five different localities in diverse river systems where C. luteus populations naturally inhabit. Sequence analysis revealed 13 polymorphic sites and 5 haplotypes. Birecik was the locality with the highest value in terms of both haplotype diversity and nucleotide diversity, Diyarbakır was the one with the lowest value. Tajima’s D and Fu’s Fs values were found to be statistically insignificant for all the localities. Population genetic diversity of this fish species was found to be low in terms of mtDNA cyt b marker. It is recommended to take measures to stop the loss of genetic diversity and to start conservation studies.
Aquatic Research, Volume 4, pp 181-207; https://doi.org/10.3153/ar21015
In the Strait of Istanbul, which is one of the most perilous natural waterways of the World, many marine accidents have occurred throughout the history. Some of these accidents resulted in deaths, financial losses, and environmental disasters. The fact that a significant proportion of the ships passing the Strait are tanker carrying hazardous cargo further increases this danger. Especially the increasing size of the ships, the increase in the cost of the for transported and the transportation of dangerous cargoes, especially oil and derivatives, to a great extent by sea, made the possible consequences of the accidents even more catastrophic. For this reason, many regulatory measures have been taken regarding the Sea Traffic in Istanbul, Çanakkale Straits and Marmara Sea, which have been named as the “Turkish Straits System” in recent years, and these measures have been collected under the Turkish Straits Vessel Traffic Service, which is briefly defined as TBGTH. Within the scope of this study, maritime accidents in the Strait of Istanbul have been examined chronologically in terms of the number of ships passing and maritime traffic regulations. The effects of the applications implemented after 2003, when Istanbul VTS started its operations, on the safety of navigation have been investigated. In this way, it is aimed to demonstrate the effect of the Vessel Traffic Services and related regulations on the improvement in the rate of marine accidents. The numerical determination of the relationship between the number of passing ships and the number of accidents in the Strait can be used as a statistically significant criterion for the realization of new regulations depending on the maritime traffic volume in the coming years.
Aquatic Research, Volume 4, pp 145-150; https://doi.org/10.3153/ar21011
Groupers are mostly found in the reef-associated marine habitat, of which some are pelagic and others are demersal. Recently, a grouper species called Oblique-banded grouper, Epinephelus radiatus (Day, 1868) was newly reported while conducting research work on the availability of reef-associated fishes in St. Martin Island. This species had never been reported to occur not only from this coral reef area but also from the water area of Bangladesh. E. radiatus was easily identified following morphological traits, especially color pattern. The findings of the present study added new distributional range for this grouper species from Bangladeshi water.
Aquatic Research, Volume 4, pp 38-54; https://doi.org/10.3153/ar21004
In this study, the fish species inhabiting the Bolaman Stream drains to the Black Sea from the Fatsa coast (Ordu Province, Turkey) was reported for the first time. The study was caught out non-periodically by sampling from seven stations in the Bolaman Stream between July 2017 and November 2018. Fish samples were captured with an electroshock device. With this study, it was determined that the fish fauna of the Bolaman Stream is represented by 10 species in five families (Acheilognothidae, Cyprinidae, Gobiidae, Leuciscidae, and Salmonidae). These species were as follows, respectively Rhodeus amarus, Barbus tauricus, Capoeta banarescui, Neogobius fluviatilis, Ponticola turani, Alburnus derjugini, Squalius cephalus, Vimba vimba, Alburnoides fasciatus, and Salmo coruhensis.
Aquatic Research, Volume 4, pp 73-87; https://doi.org/10.3153/ar21007
Plastic waste has accumulated in the aquatic ecosystem as a result of the increasing use of plastic in recent years and their wrong recycling policies. Plastic pollution has become a global problem with its effects on aquatic organisms. Plastics that break down into microplastics (MPs) and nanoplastics (NPs) due to different physical, chemical and biological factors in the environment enter the food chain and directly threaten human health. As a result of widespread plastic pollution, microplastics and nanoplastics are ingested by many different species, from zooplankton, fish, shellfish to marine mammals. Microplastics that enter into marine organisms can move within living tissue and move between tissue and organ. However, some stages in seafood processing technologies can also be a source of microplastic contamination. Physical, chemical and biological toxicity effects caused by microplastics are not fully known yet. In future studies, it is important to examine and determine the source and transmission routes of microplastics in seafood for consumer health. In this review, the risks of microplastics entering the food chain from aquatic ecosystems in seafood products in terms of food safety are discussed, and analytical methods for the identification and extraction of micro-plastics in this research area are examined.
Aquatic Research, Volume 4, pp 250-259; https://doi.org/10.3153/ar21019
The study investigated the technical efficiency of female catfish growers in Delta State, Nigeria. Data have been obtained using questionnaires from 112 female catfish farmers who have been randomly selected. Descriptive statistics, cost and return analysis as well as the stochastic model have been used in the analysis of data. The results showed that the mean age, farming experience and household size of the female fish farmers were 42 years old, 8 years and 6 persons respectively. Most of the participants are married and educated. The gross margin and net farm income were N490,378.46 and N416,242.82k respectively. With a rate of return on investment and a BCR (Benefit Cost Ratio) of 0.64 and 1.64, fish farming was found to be profitable. The Stochastic frontier outcome showed that the size of the pond, fingerlings, feed and water supply had a significant and positive effect on fish production, while the cost of medication had an inverse relationship with fish production. Age, education and household size have been found to increase technical performance, while technical inefficiency is increased by distance from farm location and credit access. The finding further revealed that a female fish farmer had a technical efficiency of 53.5% in the area of study. This is a signal that by implementing the technologies practiced by the best farmers, fish productivity can be improved by about 46.5% by the farmers. The coefficient of elasticity was 0.567, which indicated that the female catfish farmers were in Phase II. The failure of farmers to reach the production frontier may however be due to certain factors, including insufficient funding, high feed costs, water supply and fingerlings shortages. On the basis of the results, female fish farmers should be supported by means of professional training in fish production practices to ensure that their resources are optimally utilized.