Adem Yavuz Sönmez

• Dr.
• Head of Faculty at Kastamonu University

This paper investigates the microplastic (MP) abundance and morphology in Karaçomak Dam Lake, a freshwater source used for irrigation and drinking water, located in Kastamonu, Türkiye. Water and sediment samples were collected during January, April, July and October 2023 from two stations determined on the lake. MPs obtained from the samples were c...

Objective Doxycycline (DO) has been used in fish for a long time, but there are some factors that have not yet been clarified regarding its pharmacokinetic (PK) and pharmacodynamic (PD) properties. Therefore, the aim of this study was to investigate the PK and PK/PD targets of DO after 20 mg/kg intravascular (IV), intramuscular (IM) and oral (OR) g...

Günümüzde kullanılan birçok materyal; ucuz maliyeti, işlenme kolaylığı, dayanıklılığı ve elverişliliği gibi nedenlerle gerek ana hammadde gerekse yan ürün olarak yaygın bir şekilde plastik içermektedir. Bu yaygın kullanım, kaçınılmaz olarak küresel ölçekte toplam plastik üretimini ve buna bağlı olarak atık plastik miktarını gün geçtikçe attırmaktad...

This paper describes the effects of flaxseed (Linum usitatissimum) oil (FSO) as a feed additive on growth performance, oxidative stress, immunity, and disease resistance in rainbow trout (Oncorhynchus mykiss). Four-hundred-and-twenty rainbow trout individuals (mean weight: 25.66 ± 1.33 g) were fed with different doses of FSO (0.5, 1, and 1.5%) ad l...

In a feeding experiment for 75 days, the effects of fumitory (Fumaria officinalis) extract on growth, haematology, immune response and antioxidant enzyme activities in rainbow trout (Oncorhynchus mykiss) were evaluated. The aqueous methanolic extract of the plant was mixed with feeds at three different levels, 0.1% (FO1), 0.2% (FO2) and 0.3% (FO3),...

A study was conducted to evaluate the effects of dietary supplementation of white mustard (Sinapis alba) oil (WMO) on growth performance, immune responses, digestive and antioxidant enzyme activities in juvenile rainbow trout (Oncorhynchus mykiss). For this purpose, fish (initial weight: 25.77 ± 0.13 g) were divided into four experimental groups in...

The aim of the study was to investigate the plasma and muscle pharmacokinetic of enrofloxacin (ENR) and its active metabolite ciprofloxacin (CIP) in Nile tilapia (Oreochromis niloticus) following single intravascular (IV), intraperitoneal (IP), or oral (PO) administration at 30 ± 1 °C. In this study, 234 healthy Nile tilapia (120-150 g) were used....

Length-weight relationships and condition factors of Spicara flexuosa collected from Turkish coastal waters were evaluated in this study. The results indicated that samples collected from Istanbul and Çanakkale exhibited positive allometric growth while S. flexuosa showed negative allometric growth in Rize and Sinop-Kastamonu in December 2013 and J...

Determination of heavy metals is enormously important to determine the condition of the aquatic environment in terms of chemical pollution. In this study, a preliminary determination of heavy metal concentrations in sediment, water, and some macroinvertebrates in several sampling sites along Tawi-Tawi Bay, Philippines, was undertaken to have an...

The potential dietary utilization of Astragalus caudiculosus (AC) in rainbow trout (Oncorhynchus mykiss) was investigated. Four different fish groups (control, AC1, AC2.5, and AC5) were assigned and received the AC containing diet for 90 days at the rates of 0, 1, 2.5, and 5%, respectively. Results indicated that growth performance of the AC supple...

Determination of heavy metals is enormously important to determine the condition of the aquatic environment in terms of chemical pollution. In this study, a preliminary determination of heavy metal concentrations in sediment, water, and some macroinvertebrates in several sampling sites along Tawi-Tawi Bay, Philippines, was undertaken to have an ini...

This study aims to determine the trends in the aquaculture production for the rainbow trout (Oncorhynchus mykiss Walbaum, 1792) in Erzurum, Turkey. ġen's innovative trend analysis methodology was applied to the time series of aquaculture production of the rainbow trout in Erzurum. The time series for the amounts of the aquaculture production of the...

We examined antioxidant enzyme activities, immune response, blood parameters and growth performance of rainbow trout fed with different doses of cherry stem (CS) aqueous methanolic extract. Four different feeds containing CS extract in different doses, 0% (control), 0.1 (0.1% CS), 0.5 (0.5% CS) and 1% (1% CS), as treatment feeds were prepared. Fish...

In the present study, antioxidant activity, immune responses, and growth performance of rainbow trout (Onchorhynchus mykiss) juveniles fed with diets supplemented with dandelion (Taraxacum officinalis) and lichen (Usnea barbata) extracts were assessed. Four different concentrations of aqueous methanolic extract of the plants (0% (control), 0.1%, 0....

This study investigated the immunomodulatory effects of Sargassum polycystum extract administration in rainbow trout (Oncorhynchus mykiss). S. polycystum methanolic extract was administered orally using feeding needles to individual rainbow trout at the dose of 0 (control), 1 (S1), 3 (S3) and 5 (S5) mg/100 μl/per fish twice a day for 7 days. On 1st...

In teleosts, biometric parameters of certain bony structures are used for the age and/or size determination of the fish. Otolith is perhaps the most widely used of these bony structures. There are numerous studies which have shown that otolith biometry is positively and strongly correlated with fish size. In this paper, some recent studies that inv...

This study was conducted to investigate a potential new organic anaesthetic for aquaculture practices. Aqueous macerate of spurge stem (Euphorbia rigida) was obtained by adding 200 g of plant powder to 1.5 L of distilled water and applied to rainbow trout (Oncorhynchus mykiss) at 5 different concentrations (30000, 40000, 50000, 60000 and 70000 µL L...

The skin of many fish species is covered with a layer of mucus that acts as a barrier between the fish and the environment. Mucus, which plays an important role in disease resistance, contains lectins along with many other components. Lectins are proteins with carbohydrate recognition and binding properties that are naturally produced by many organ...

This study was designed to prevent fungal disease (Saprolegnia parasitica) that occurs on rainbow trout eggs (Oncorhynchus mykiss) by using wastes of onion (Allium cepa) and garlic (Allium sativum) plants. For this purpose, fertilized rainbow trout eggs were exposed to garlic skin, garlic stem and onion skin aqueous methanolic extracts by bathing i...

The objective of this paper is to determine the trend and to estimate the streamflow of the Gökırmak River. The possible trend of the streamflow was forecasted using an autoregressive integrated moving average (ARIMA) model. Time series and trend analyses were performed using monthly streamflow data for the period between 1999 and 2014. Pettitt's c...

In this study, the taxonomic resolution and phylogenetic relationship of two presumed subspecies of Merlangius merlangus, namely M. m. euxinus and M. m. merlangus, were investigated. In addition, the effect of the Turkish Straits System on the evolutionary history and genetic structure of M. merlangus, was explored. The mitochondrial cytochrome c o...

In this study, we examined changes occurred in blood parameters, immune responses, antioxidant enzyme activities, and growth performance of rainbow trout (Oncorhynchus mykiss) administered with ribwort plantain (RP) through feed. Fish (mean weight 36.56 ± 1.99 g) were fed a diet supplemented with an aqueous methanolic extract of RP at variable dose...

The main purpose of this study was to estimate possible climate change effects on the annual streamflow of Filyos River (Turkey). Data for annual streamflow and climatic parameters were obtained from streamflow gauging stations on the river and Bartın, Karabük, Zonguldak meteorological observation stations. Time series analysis was performed on 46...

Bu çalışmada Kastamonu, Sinop ve Zonguldak kıyılarından üç istasyondan temin edilen su örneklerinin ihtiva ettiği Mn, Cd, Zn, Cu, Fe, Ni, Pb ağır metallerinin düzeyleri tespit edilmiş ve mevsimsel değişiklikleri incelenmiştir. Su numunelerinin analizleri ICP-OES (SpectroBlue) cihazında yapılmıştır. Çalışma sonuçlarına göre bazı ağır metallerde ista...

In this paper, it is aimed to determine the trends in streamflow of Devrekani Stream. Dataset including annual, seasonally, and monthly mean streamflow was evaluated to determine the trends in the streamflow of Devrekani Stream. This dataset covers the period between 1996 and 2016. Change-point analysis was implemented to detect the change point in...

In this study, post‐mortem myofibril proteins change in myosin heavy chain (MHC) mass using sodium dodecyl sulphate‐polyacrylamide gel electrophoresis (SDS‐PAGE), texture properties such as hardness, stickiness, cohesiveness, elasticity, chewiness, gumminess and stress relaxation test parameters (Fmax, Fmin and Fmax‐Fmin) were determined and compar...

In this study, effects of tetra (T) (Cotinus coggygria) and common mallow (CM) (Malva sylvestris) aqueous methanolic extracts on growth performance and immune response in gilthead sea bream, Sparus aurata (19.92 ± 0.40 g) and European sea bass, Dicentrarchus labrax (18.66 ± 0.86 g) were investigated. The experiment was designed as 5 treatment group...

Water is one of the most important natural resource and assessment of the trends in water has a great importance to estimate the future of water resources. The main purpose of this study is to present a trend analysis of the streamflow of Daday Stream in Kastamonu, Turkey by monthly, seasonal and annual analyses. Monthly streamflow data were obtain...

This study investigated the effect of cyclopamine, a hedgehog signaling inhibitor, on immune-related gene expression in rainbow trout head kidney leukocytes in vitro. At 1h sampling time COX 2, IFN-2, TNF-α, C3, MHC-II, Il-1β, IL-12, IL-10, and IL-6 increased significantly in groups exposed to cyclopamine at 30 μg/ml. However, in groups exposed to...

Water quality is one of the main characteristics of a river system and prediction of water quality is the key factor in water resource management. Different physical, biological and chemical parameters including heavy metals can be used to assess river water quality. Evaluation of the water quality in the rivers is quite difficult and requires more...

This paper presents trend analyses of streamflow of Akkaya Stream in Turkey. Streamflow trends of the river were monitored during 50-year period by monthly streamflow data observed from the streamflow gauging station on the river. Trend analyses were performed by annual, seasonally and monthly analyses of streamflow data. Monthly streamflow data we...

This study was carried out for a period of 12 months from September 2016 to August 2017 at 4 stations determined in Beyler Dam Lake in Kastamonu, Turkey. In this study, some parameters such as temperature, pH, conductivity, dissolved oxygen, ammonium, nitrate, nitrite, phosphate, chemical oxygen demand (COD), biological oxygen demand (BOD) were inv...

Global warming and its impacts are known to cause serious problems in sustainability of natural resources. In this study, change-point analysis and trend analysis were applied to climatic (temperature, precipitation, evaporation) and streamflow data for Tuzla, Gediz and Büyük Menderes rivers. Box-Jenkins technique and ARIMA model were used for tren...

In this study, effects of grape Vitis vinifera seed oil supplementation (0, 250 mg, 500 mg, 1,000 mg/kg feed) for 60 days on rainbow trout Oncorhynchus mykiss juveniles were investigated. The average final fish weights were not different between the control group and 500 mg/kg feed group (p > .05), but 250 mg/kg feed group were lower than those of...

In this research, the structural and economic analysis of the enterprises that produce trout in net cages raceway systems in Kastamonu province were carried out. The data regarding the operations are obtained through a questionnaire applied in 2015. For each of the enterprises, the average production of trout in the cages is 3.920 m 3 , and the ave...

The aim of this study was to evaluate and compare the haematological parameters of cultured Russian sturgeon (Acipenser gueldenstaedtii), stellate sturgeon (Acipenser stellatus) and Siberian sturgeon (Acipenser baerii) in recirculating aquaculture system. Total erythrocytes, thrombocytes, red blood cell distribution, monocytes, basophils as well as...

This study examined the effects of fully autolyzed Saccharomyces cerevisiae (ASC) on rainbow trout (Oncorhynchus mykiss) growth performance, liver histology and fatty acid composition. 2700 rainbow trout (4.9 ±0.1 g mean weight) were acclimated to rearing conditions and then randomly divided into three groups of triplicate cages. Rainbow trout were...

S In the present study, it was aimed to assess of the quality of fish grown in a recirculation aquaculture system (RAS). For this purpose, three sturgeon species especially Acipenser gueldenstaedtii, Acipenser baerii, and Acipenser stellatus were investigated. Concentrations of certain metals (Cu, Cd, Pb, Zn, Fe, Ni) in gills, liver and muscle samp...

A feeding trial was performed to assess any beneficial effect of three herbal oils; mint, thyme and sage oils containing 74 g kg-1 pulegone, 77 g kg-1 carvacrol and 76 g kg-11,8-cineole, respectively on growth performance, survival, fatty acid composition, and liver and kidney histology of rainbow trout (Oncorhynchus mykiss). Herbal oils were added...

This study evaluated effects of dietary supplementation of sage (Salvia officinalis), mint (Mentha spicata) and thyme (Thymus vulgaris) oils on growth performance, lipid peroxidation level (melondialdehyde, MDA) and liver antioxidant enzyme activities (superoxide dismutase, SOD; catalase, CAT; glucose-6-phosphate dehydrogenase, G6PD; glutathione re...

As in other vertebrates, the pineal organ in salmonids receives photic information directly through specialized photoreceptor cells to synchronize both daily and seasonal behavioral and physiological events, including the reproductive. In this study, the effect of a melatonin implantation before the preovulatory period on egg quality was investigat...

A 90-days growth trial was conducted to determine the effects of prebiotic mannanoligosaccharides (MOS) on the histology and biochemical blood parameters of the gilthead seabream (Sparus aurata). Two experimental diets were formulated to contain MOS (Bio-Mos ®) levels ranging 0 and 2 g kg -1 . The fish averaging 172.11±13.19 g were reared in six oc...

Heavy metals are among the most persistent of pollutants in aquatic systems due to their resistance to decomposition in nature. Four assessment methods (two pollution indexes and two fuzzy mathematical models - single-factor deciding and weighted average models) were used to check the level and characteristics of heavy metal pollution in the Karasů...

Traditional water quality evaluation methods use discrete form that involve upper and lower limits, and the concentrations values are equally important when the values are near to or far away from the limits. Moreover, each quality parameter might belong to one of the four classes; therefore differences of the classes of the parameters may be vague...

In this study, cadmium (Cd), copper (Cu), iron (Fe), nickel (Ni), lead (Pb) and zinc (Zn) levels were determined in the tissues (muscle, liver and gills) of two fish species, Capoeta capoeta umbla and Chalcalburnus mosullensis, collected from three stations of the Karasu River. The lowest metal accumulation was detected in the muscle tissues. Moreo...

An investigation has been described on the relationship of body length, age and sex with adipose fin length and the number of androgen receptor (AR)-containing cells in the adipose fin as a secondary sexual characteristic for brown trout (Salmo trutta fario). Firstly, body and adipose fin lengths of 2- to 5-year-old brown trout were measured. There...

The aim of this study is to predict carcass weight from some morphological traits (total length, fork length, standard length, head length, body height and weight) by using jointly factor and multiple regression analyses. A total of 91 Capoeta capoeta capoeta fish was used to estimate carcass weight. The suitability of factor analysis was determine...

This study was conducted to estimate body weight from several biometrical traits viz. total and fork lengths, body height, head length, adipose fin width and adipose fin length of Salmo trutta fario trouts. A sample of 140 Salmo trutta fario trouts (70 male & 70 female) was used in this investigation. First, only multiple regression analyses were a...

ÖZET: Ridge ve temel bileşenler regresyon analiz yöntemleri, çok değişkenli regresyon verilerini analiz etmek için kullanılan istatistik analiz yöntemleridir. Çoklu bağlantı ortaya çıktığında en küçük kareler tahminleri sapmasız olmasına karşın tahminlerin varyansları büyük olduğundan gerçek değerlerinden oldukça uzakta olabilmektedirler. Bir derec...

Sex determination in trout is generally performed by measuring morphologic features during the reproductive period. In this study, body height and weight, total length, fork length, adipose fin length and width, and head length were measured during the non-reproductive period, and discriminant and Chi-Square Automatic Interaction Detector (CHAID) a...

Three feeding regimes were tested to determine their effects on growth, survival, and feed conversion in rainbow trout alevins for 60 days. In the first regime, the alevins were fed a starter feed consisting of 800 micron particles for the first 15-day period. For the following 15-day period, the alevins were given a starter feed consisting of 1200...

In vivo effects of cadmium on antioxidant enzymes such as super-oxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathione reductase (GSR) investigated in liver and kidney tissues of rainbow trout (Oncorhynchus mykiss). Three test groups of fish were subjected to cadmium in concentrations of 0 (control), 1 and 5 ppm. The du...

The effects of cadmium (Cd) on the enzymatic activities of glucose 6-phosphate dehydrogenase (G6PD) and 6-phosphogluconate dehydrogenase (6PGD) were investigated in the gill, liver and kidney tissues of rainbow trout (Oncorhynchus mykiss). Three test groups of fish were subjected to increasing concentrations (1, 3 and 5 mg/l) of cadmium (Cd) in viv...

The effects of 4 different scotophase, the dark phase of photoperiods, LD8:16 (8 h light:16 h dark), LDl2:12(12 h light: 12 h dark), LD16:8(16 h light: 8 h dark) and LD24:0 (24 h light: 0 h dark) on growth, feed conversion and survival rate of rainbow trout, Oncorhynchus mykiss fry with 2 g initial weight were investigated. The fry exhibited better...

In present study, differences of organic fish from the cultured one was investigated with respect to moisture, crude protein, crude fat, dry matter and muscle fatty acid distribution. The experiment was carried out in 6 earthen ponds with 3 m × 2 m × 1 m dimensions at the farm in central research and extension center of agricultural faculty for 120...

In present study, differences of organic fish from the cultured one was investigated with respect to moisture, crude protein, crude fat, dry matter and muscle fatty acid distribution. The experiment was carried out in 6 earthen ponds with 3 m × 2 m × 1 m dimensions at the farm in central research and extension center of agricultural faculty for 120...