Turkish Journal of Fisheries and Aquatic Sciences
ISSN : 1303-2712
Published by: Central Fisheries Research Institute (10.4194)
Total articles ≅ 140
Latest articles in this journal
Published: 18 January 2022
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas20642
The immersed sensor data in Alexandria Eastern Harbor (AEH) are analyzed to explore the relation between latent heat flux (LHF) from the AEH and the sea surface temperature (SST). Output results represent that the LHF continued to rise with SST≥292K, while LHF increases with decreasing SST at SSTs lower than 292 K, However, the relationship cannot be expounded by thermodynamic investigation alone. Consequently, the analysis of humidity differences (Δq) and wind speeds represent that the Δq primarily determines the sharp increase in LHF while at high SST, and a decrease in wind speed is mostly responsible for the low LHF at low SST. The temporal analysis of the two time periods, namely ≤90 days (seasonal time scale) and ≤30 days (monthly timescale), reveals that high LHF above warm SST was operative on the two time periods. The cross-correlation between SST and LHF on these time periods was characterized by a one-day lag with correlation coefficients of 0.47 and 0.25, respectively.
Published: 12 January 2022
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas18410
Human activities have impacted negatively the benthic macroinvertebrate assemblage of River Kipsinende in Kenya consequently affecting the biodiversity of the area. The study assessed the impact of anthropogenic activities on benthic macroinvertebrates’ assemblage in the river. Quantitative triplicate samples were collected from three different longitudinal sections along the river and four biotopes from six stations. Sample collection was done monthly from (November-December, 2019, January and March, 2020). 72 samples with 20,040 macroinvertebrate individuals belonging to 14 orders, 48 families, and 68 genera were identified. The relative abundance of Dipteran was greater than Ephemeroptera. Ephemeroptera abundance in percentage was also greater than Trichopteran and Bivalvia. The relative abundance of Dipteran and taxon group of % EPT had an inverse relation across study sites. The highest diversity and evenness were observed in station KB and the lowest in KA. Station KC had the highest number of individuals followed by station KA and the least was at station KE. The results of the canonical correspondence analysis (CCA) shown the physico-chemical parameters were affecting the macroinvertebrates communities in the river. This study provides baseline and scientific information for the appropriate water management of freshwater streams in Kenya.
Published: 30 December 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas19882
The present study was designed to evaluate the dietary effect of dietary supplementation of Bacillus licheniformis on growth, hematological and immune parameters of Oreochromis mossambicus fingerlings. A feeding trial of 8 weeks was carried out, in which fish were fed at a rate of 2% body weight with four experimental diets, including a control diet and three supplemented diets such as, 105, 107 and 109 CFUg-1 respectively. At the termination of feeding experiment, growth related parameters, hematological and immune response of fish were evaluated. Feed conversion ratio (FCR) was significantly decreased, inferring high efficiency in utilizing feed. In similar groups, hematological parameters such as total erythrocyte count, total leukocyte, total serum protein, blood glucose level and hemoglobin count were significantly increased (P<0.05), with higher probiotic concentration. Similarly, digestive enzyme activity of protease, lipase and amylase was also higher in fish fed with increased concentration of probiotic. Diet groups having 109 CFUg-1 of probiotic was observed with elevated immune response, as levels of lysozyme activity, respiratory burst activity and phagocytic activity were significantly higher (P<0.05) in this group as compared to control group. In conclusion, supplementation of diet with Bacillus licheniformis can enhance growth performance, and health status of O. mossambicus.
Published: 21 December 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas18987
The paper presents the analysis of hyponeustonic species present in the south-western part of the Black Sea, in October 2019, within the ANEMONE Project. From the qualitative and quantitative point of view, two species were identified: Anomalocera patersonii Templeton, 1837 (WoRMS) and Pontella mediterranea Claus, 1863 (WoRMS). The analyzed samples showed significant densities of these species, being found in different development stages, from nauplii to copepodites but also as adults and having a representative distribution on the entire analyzed surface. A. patersonii was abundant in the northern part of the Romanian marine area, the southern marine area of Bulgaria and in Turkey central area, while P. mediterranea recorded a higher abundance in the Romanian Black Sea area.
Published: 21 December 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas19462
In this study, the Sharpsnout Seabream (Diplodus puntazzo) population parameters (age, sex composition, length-weight relationship (LWR), age-length relationship, growth parameters, condition factor, gonadosomatic index, reproductive) of the sharpsnout seabream (Diplodus puntazzo) in the southern Black Sea Region have been investigated. In the study carried out between April 2018 and March 2019, 276 sharpsnout seabream were sampled and the average length and weight were calculated as 30.0 cm and 463.9 g, respectively. Male and female ratio was determined as 1:1.32 (P>0.05). Age of fish varied between 0-9 years. The von Bertalanffy growth parameters were L∞=48.1 cm, k=0.2656 year-1 and t0=-1.6587 year for all individuals. The LWR was found as W=0.0399 L2.7212 for all individuals. Total mortality rate (Z=0.560), natural mortality rate (M=0.501) and fishing mortality rate (F=0.059), growth performance index (φ'=2.73) and condition factor value (K=1.55) were calculated. The maximum GSI value was 6.83 in September. Mean relative fecundity was calculated as 14695.4 eggs / 1g. The mean egg diameter was calculated as 486.83µm. This study is very important in terms of being the first study on this species in the Black Sea and will provide a source for future studies.
Published: 10 December 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas18813
A two-month experiment was conducted to evaluate the effect of complex carbon sources on the biofloc system and its influence on Penaeus vannamei culture. Four sources of carbon viz. Tapioca flour (BFTf), Rice bran (BFRb), Wheat flour (BFWf), Rice Flour (BFRf), and biofloc were generated, the absence of CHO being considered as control (C). The experiment was carried out in 100L FRP tanks in triplicate, and the post-larvae (ABW: 0.11 g) were stocked @ 400 PL/m3. Results revealed that the addition of complex carbon sources effectively reduces the TAN by 62-67%. The average body weight of shrimp in the rice flour and wheat flour treatments were significantly higher compared to control. Similarly, improved survival was observed in rice bran treatment (89%). Beneficial bacteria were isolated from all the treatments as well as control. Real-time analysis revealed significantly (P<0.05) higher expression of digestive enzyme-related genes compared to control the utilization of carbohydrates, exhibiting an encouraging trend. The complex carbon sources (BFRf) and (BFWf) have been effectively utilized, resulting in improved water quality, microbial diversity, growth performance, and enhanced digestive enzyme activity.
Published: 25 November 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas20235
The immune system of all jawed vertebrates is composed of two major subsystems, the innate (non-specific) and adaptive (specific) immune system. The innate immune system is the first to respond to infectious agents; however, it does not provide longlasting protection. The adaptive immune system is activated later and responds to pathogens with specificity and memory. The main components of the adaptive immune system, including T cell receptors (TCRs), major histocompatibility complex (MHC), immunoglobulins (Igs), and recombination-activating gene (RAG) arose in the first jawed fish (cartilaginous and teleost fish). This review explores and discusses components of the adaptive immune system in teleost fish and recent developments in comparative immunology. Similar to mammals, the adaptive immune system in teleost fish is divided into two components: cellular-mediated responses and humoralmediated responses. T cells, the principal elements of cellular-mediated adaptive immune responses, differentiate into effector helper T (Th) cells or effector cytotoxic T cells (CTLs). The central elements involved in the differentiation of Th subsets in mammals, cytokines and master transcription factors, have also been identified in teleost fish. In addition, each subset of Th cells, defined with a particular cytokine to control the immune responses, has been described in teleost fish. Similarly, to mammals, CTLs contribute to cellular cytotoxicity in teleost fish. B cells act as a central player in humoral-mediated adaptive immunity by producing opsonizing, neutralizing and complement-binding antibodies and inducing antibody-dependent cellular cytotoxicity (ADCC). Three classes of antibodies named IgM, IgD, and IgT/Z have been characterized in teleost fish. The presence of an adaptive immune system and consequent immune memory in teleost fish allows vaccination, the most appropriate method for disease control in aquaculture. Immunological studies in fish provide a comprehensive assessment of the fish immune system, which is crucial for understanding the evolution of the mammalian immune system.
Published: 23 November 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas20537
Marine litter is a crucial problem for marine environment, and this problem is generally based on anthropogenic activities. Even though human-induced activities that cause marine litter are well known, they have not been assessed for the microplastic pollution yet. Here, we present the Microplastic Pollution Index (MPI); a fast, convenient, inexpensive and semi-quantitative tool for assessing land- and marinebased pressures on the sampling area. In this preliminary study, MPI were determined for eight different locations in Marmara Sea. The Marmara Sea is under the effect of several pressures, which can be seen from MPI results. Furthermore, currents and coastline morphology affect the retention time of water at the coastal zone. The highest MPI values were obtained from the Izmit and Bandırma gulfs, whereas the lowest value was found at entrance of the Dardanelle Strait. MPI values and manta net abundance values for each station showed a good linear relation (R2 = 0.58; F = 7.113; DF =1, q = 0.045). No correlation was found between the water column and sediment abundance values. MPI is providing information on microplastic pollution, which is useful to create an effective monitoring strategy. Furthermore, environmental managers can use this information to combat, restore and protect coastal waters against the microplastic pollution.
Published: 19 November 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas20312
One of the most massive red tides at the Odessa Bay was observed in September October 2020. It was caused by a toxic dinoflagellate Lingulodinium polyedrum (Stein) Dodge. The maximum abundance (56.1 x 106 cells L-1) of L. polyedrum was registered at the Odessa port area on October 6 when a water temperature and a salinity were 19.7°C and 14.3 ‰ respectively. The red tide was so huge and dense that the water glowed at night due to the bioluminescence characteristic of this species. The article briefly describes the history of the study of L. polyedrum in this area and provides a detailed morphological description with original photographs of this species sampled from bloom. We associate the appearance of the red tide with an increased temperature of sea water and air, a high content of nutrients, the presence of viable L. polyedrum cysts, and a slight decrease in salinity in the bay during the period of a mass development of the species in autumn of 2020. The red tide was accompanied by Protoperidinium steini, P. divergens, Prorocentrum cordatum, P. minimum, P. micans, Gonyaulas scrippsae, Diplopsalis lenticula, Azadinium spinosum, Dinophysis rotundata, D. acuminata, Oblea rotunda, Scrippsiella trochoidea, Ceratium furca.
Published: 17 November 2021
Turkish Journal of Fisheries and Aquatic Sciences, Volume 22; https://doi.org/10.4194/trjfas20507
Microplastic pollution is one of the pressing environmental issues over the world that pose risks to aquatic ecosystems and humans. Significant amount of anthropogenic plastic litter known to be transported with freshwater systems to marine environment. The aim of the present study is to reveal the abundance and spatio-temporal distribution of MPs pollution in the three main freshwater systems (Aksu and Köprü Streams, Manavgat River), located through the costal line of the Antalya Bay. 106 water samples obtained from these three freshwater systems and fishing grounds located in the vicinities of these systems were evaluated. A total of 2444 MPs with a mean size of 1777.16±1168.81 µm detected within these samples. A homogeneous MPs pollution was observed in the area. Four colours (Black-27.3%, White-19.4%, Red18.7% and Blue-16.2%) found to composed more than 80% of the detected MPs. Majority of MPs detected within the framework of the study were fiber (57.1%) and fragment (32.6%). Most common polymer type was Polyproplene-(PP) with 50%. Results obtained from this study have the potential to form the basis for future studies that take into account the terrestrial use and the prevailing physical factors in the region in the study area.