Mahir Kanyılmaz

Mediterranean Fisheries Research Production and Training Institute · Department of Aquaculture

The Turkish aquaculture sector is growing very rapidly, yet the impacts of the pandemic on both sea and inland water operations remain unclear. To provide a knowledge baseline based on stakeholders, we carried out a rapid assessment in the present study. The primary objectives were to evaluate the stakeholder perceptions regarding economic loss att...

Stock assessment for Mullus barbatus using catch-based (CMSY) and length based (LBB, LBSPR and LIME) data limited models were performed by using official catch statistics and commercial length frequency data from northeastern Mediterranean. The CMSY model results showed that the catch amount did not exceed MSY, and the fisheries reference points (B...

The use of doctor fish, Garra rufa, is widening in the treatment of psoriasis and in recreational spas all over the world. The increasing demand for the fish has created pressure on its wild stocks, making its rearing in captivity necessary. However, there is no specifically formulated diet meeting the dietary nutrient requirements of doctor fish a...

Pufferfishes are commonly found in tropical and subtropical marine waters and include 28 genera and approximately 184 species all over the world in marine waters within the Tetraodontidae family. The Tetraodontidae family is famous for the occurrence of the powerful marine paralytic toxins in their body called Tetrodotoxin. For this reason, they ha...

In this study, the effects of six different dietary levels of commercial surface‐modified clinoptilolite (Minazel Plus® [MP]; 0, 1, 1.5, 2, 2.5 and 3 g kg−1) were observed for fingerling gilthead sea bream in recirculating aquaculture system (RAS) for 60 days. All experimental groups showed higher final weight, weight gain and specific growth rate...

Two cultured catfish species (European catfish Silurus glanis, and African catfish Clarias gariepinus) were evaluated for their weight estimation and colors by image analysis. A total of 60 whole fish from each species were first weighed, and then their pictures taken by a digital camera in a light box. Length, weight and color of all fish were det...

The global effects of the Covid-19 pandemia have disrupted the normal of human beings. In this period, the agriculture and food sector has reached a very sensitive and strategic position because of the extraordinary condition. It has been understood that the supply chain from the producer to the consumer should not be disrupted in order to ensure s...

As known for different metabolic functions, α-lipoic acid (ALA) has been tested for spermatozoa preservation of animals as well as of human, but not for fish spermatozoa. The present study determined the effects of ALA on short and long-term (cryopreservation) preservation of common carp (Cyprinus carpio) spermatozoa, for the first time. For that,...

The aim of the present study is to assess the effects Fenugreek (Trigonella foenum-graecum, Fabaceae), sunflower (Helianthus annuus, Asteraceae), green cardamom (Elettaria cardamomum, Zingiberaceae) and seed extracts, which they belonged to three different plant families, on common carp (Cyprinus carpio L.) spermatozoa motility parameters and oxida...

Determination of apparent digestibility coefficients (ADC) of ingredients has a central importance in formulation of aquaculture diets. Heterotrophic and phototrophic grown microalgae are considered as one of the best eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) as well as protein alternatives for fish oil and fish meal (FM) to susta...

Ortalama başlangıç ağırlığı 88,61±0,82 mg olan zebra balıkları (Danio rerio) protein düzeyi % 20-55 arasında değişen sekiz adet izoenerjitik yemle beslenmiştir. Her bir deneme yemi üç tekrarlı olarak 6 hafta boyunca balıklara verilmiştir. Spesifik büyüme oranı (SGR) 2. ve 4. haftalarda kuadratik olarak etkilenirken, bu eğilim deneme sonunda kaybolm...

This study aimed to estimate the triploidy ratio from blood erythrocyte cell size and anomalies. The study was conducted at Firniz Rainbow Trout Hatchery of Kılıç Holding, Kahramanmaraş, Turkey. After five male trout sperm and 5 female eggs were collected and pooled by sexes, they were gently mixed for fertilization. The eggs were separated into 4...

The FAO EastMed project has devoted a great deal of effort to setting, implementing and disseminating a collection methodology for socio-economic data in the region and one of the main motivations for this was to have homogeneous data that would allow for regional analyses to be conducted. The methodology consists of a multivariate sampling survey...

The efficacy of clove oil, 2-phenoxyethanol and benzocaine was tested on captive-bred European catfish (wels), Silurus glanis L., 1758 in this study. According to effectiveness criteria, the most optimal implementation results were obtained from 100 μl L⁻¹ (induction 69.00±6.48 s and recovery 253.86±14.78 s) clove oil, 1000 μl L⁻¹ (induction 88.71±...

In this study, a feeding trial was conducted to examine the potential of replacing fish meal with brewers yeast in practical diet of goldfish (Carassius auratus). Five isoproteic (37% CP) and isocaloric (3350 kcal/kg) diets were formulated to contain graded levels of brewers yeast. Fish meal protein was replaced by 0%, 15%, 25%, 35%, and 45% of yea...

In this study, it was aimed to investigate the effects of dietary zeolite supplementations on blood parameters of gilthead seabream (Sparus aurata). Zeolite was gradually included into the diets at 0%, 1%, 2%, 3% and 4% and fed to triplicated groups of fish for 10 weeks. Dietary zeolite levels did not affect red blood cell, white blood cell and hem...

This study aims to determine the production characteristics and performance of rainbow trout hatcheries in Seydikemer, Mugla, Turkey where over half of the total production of eyed eggs and juveniles take place. For this purpose six hatcheries with different production scales were selected and coded A, B, C, D, E and F (with capacities of 60, 15, 5...

The present study aimed to determine reproductive performance of a newly described Salmo species, Salmo kottelati (Alakir trout), under culture conditions. With this purpose, hatching performance of 10 selected females was evaluated by fertilizing with pooled sperm from 10 males. For determination of sperm characteristics, 10 males were randomly se...

This study was undertaken to investigate the effect of dietary supplementation of L-carnitine on the growth performance and liver histology in fry of Nile tilapia, Oreochromis niloticus. Five isonitrogenous and isolipidic experimental diets were formulated to contain 0 (control), 250, 500, 750 and 1000 mg L-carnitine kg-1, respectively. Fish were r...

Salmo kottelati sp. n., is described from Alakır Stream (Mediterranean basin) in Turkey. It is distinguished from other Anatolian Salmo species by a combination of the following characters (none unique to the species): general body colour greenish to silvery in life; 7–9 parr marks along lateral line; four dark bands on flank absent in both sexes;...

Natural zeolites have been increasingly used in terrestrial animal and freshwater fish diets as a growth and health promoter, but few studies have considered marine fish. Therefore, this study was planned to investigate the effects of dietary zeolite (clinoptilolite) incorporation on growth, feed and nutrient utilizations, whole body composition, w...

This study was conducted to determine the effects of zeolites on total ammonia nitrogen (TAN) removal during a 24-hour-sea bass transportation. Five experimental treatments (0 (control), 10, 20, 30 and 40 g/L zeolite) with 3 replications were tried in 14 L plastic tanks. To each tank 90 sea bass (total weight 175.07 ± 0.49 g) were stocked. The zeol...

Although ornamental fish trade in Turkey has been an important sector for a long time, the supply in this business is mainly importation. Based on this reality, several entrepreneurs have started to aquarium fish culture in Antalya for 10 years to benefit from geographical and meteorological advantages of the region. The present study aimed to dete...

Ornamental fish farms have emerged in Antalya, Turkey, during the last 10 years as an alternative to other aquaculture and agriculture activities due to their high market values. The present study aimed to determine the technical and economical aspects of the operations using data collected with interviews with 9 farms in Antalya. The data indicate...

This study was conducted to determine the effects of various time lengths of restricted feeding at 0.5% of body weight on compensatory growth (CG) in rainbow trout under summer conditions. Seven treatments with triplicate tanks consisted of control (C) fed to satiation over 98 days and the remainder being one (R1) to six (R6) weeks of restriction a...

This study was conducted to determine the effects of various lengths of starvation periods on following compensatory growth (CG) in rainbow trout under summer conditions (18.1°C and day length of 12.5-14.5 hours). Five treatments with triplicate tanks were as follows: control (C) fed to satiation over 84 days; one (S1), two (S2), three (S3), and fo...

This study aimed to characterize the effluents of 3 flow-through farms with annual production rates of 250, 750 and 2500 t yr(-1) at a site with a total annual production of 4400 t yr(-1). We determined the nutrient loads from rainbow trout Oncorhynchus mykiss farms using nutritional and hydro logical mass-balance models and estimated the fluxes in...

This study was conducted to determine the effects of various levels of dietary protein restriction for 3 weeks (phase 1) on compensatory growth, nutrient utilization, body compositions and organ indices of rainbow trout (Oncorhynchus mykiss) during a nine-week realimentation phase (phase 2). Five experimental treatments consisted of four protein re...

Rainbow trout production beginning in 1980s in Fethiye region has improved and become one of the important production sites in Turkey. In the region a great amount of trout juvenile and eyed egg is produced. Thus it is important to determine technical aspects and capacity use regarding the juvenile production. In this study, it was aimed to determi...

Hazelnut meal was evaluated as an alternative protein source to fishmeal in diets for rainbow trout, Oncorhynchus mykiss (initial wt 57.5±0.1 g). Hazelnut meal was incorporated in the diet at levels of 0% (control), 7.5%, 15%, 22.5%, and 30%. Diets were tested in triplicate for ten weeks. Higher levels of hazelnut meal produced better growth perfor...

In this study, it was aimed to investigate the effects of fish feed containing varying levels of dietary zeolit on growth and body composition of common carp (Cyprinus carpio L., 1758). The fish were fed twice a day with diets containing dietary zeolit at 0 (control), 1, 2, 3 and 4 %, respectively. Each diet was triplicated and with 15.09 ± 0.02 g...

Background. Reducing feed cost and the pollution originating from feed have been principal matters in fish nutrition. Mixed feeding schedules have been proposed as one of the methods to reduce both of them and successfully tested in many fish species. The aim of the present study was to determine the mixed feeding schedules’ suitability for culture...