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Öğe A photonic sensor system for real-time monitoring of turbidity changes in aquaculture(Wiley, 2024) Tolon, Mustafa Tolga; Tokac, Adnan; Kostak, Enis N.; Strehse, ChristophObjectiveThe objective of this study was to test the compatibility and performance of a developed photonic sensor system, which can serve as a dependable and practical device for continuous monitoring of turbidity changes in aquaculture tanks.MethodsThe fabricated photonic sensor system consisted of an integrated data logger and sensor probe. The sensor probe exhibited a precise emission of infrared light at a wavelength of 850 nm. Moreover, the sensor evaluates the ambient light across the red-green-blue spectrum. To ensure accuracy and reliability, the entire system underwent a thorough calibration process, referencing nephelometric turbidity unit values acquired through a specialized handheld turbidimeter. Rigorous trials were systematically conducted in 600-L seawater tanks featuring tubular sea cucumber Holothuria tubulosa and Gilt-head Sea Bream Sparus auratus to ensure the sensitivity and robustness of the photonic sensor system to the aquaculture environment.ResultA calibration curve revealed a significant correlation between the infrared channel values of the sensor (photon counts) and the turbidity values measured by the turbidimeter. The photonic sensor effectively captured turbidity changes in the aquaculture tanks, with significant differences observed between the tanks. The sensor performance was evaluated in trials with Gilt-head Sea Bream, which showed sensitivity to high turbidity changes. The photonic sensor system accurately reflects turbidity changes continuously using its own active light source, independent of ambient light intensity, which is essential for turbid water conditions or for taking measurements in total darkness.ConclusionThe photonic sensor is a reliable tool for the continuous and accurate monitoring of turbidity changes in aquaculture systems. However, there are specific usage limitations under low-turbidity conditions that can be improved in further studies. Impact statement The photonic sensor system, as designed for this study, is capable of accurately measuring turbidity changes using its own active light source independent of ambient light intensity, allowing 24-h monitoring of turbid water conditions or taking measurements in total darkness. Moreover, this system may be useful in detecting turbidity changes associated with algal blooms in sea cages or from poor water treatment performance of filtration systems in recirculating aquaculture.Öğe Deniz hıyarı (Holothuria Tubulosa)'nın tankların yan yüzeylerine tutunma davranışını etkileyen faktörlerin incelenmesi(Ege Üniversitesi, 2017) Emiroğlu, Dilek; Günay, Deniz; Hancı, Begüm; Tolon, Mustafa TolgaDeniz canlılarının farklı uyarıcılar karşısında verdikleri tepkileri içeren davranış biçimlerinin anlaşılması, yapay yaşam ortamlarının oluşturulduğu yetiştiricilik çalışmalarında başarıya ulaşmak için anahtar niteliktedir. Deniz hıyarlarının tank, akvaryum ve kafes gibi kapalı yetiştirme ortamlarının yan yüzeylerine tırmanma ve bu yüzeylerde tutunma eğilimine olduğu daha önce birçok araştırmacı tarafından rapor edilmiştir. Deniz hıyarlarının yan yüzeylerde tutunma davranışı, özellikle sediment, beslenme ve stok yoğunluğu gibi, canlının tankların tabanında kalmasını gerektiren çalışmalarda elde edilen verilerin doğruluğunun azalmasına veya çalışmaların aksamasına neden olabilmektedir. Yetiştiricilik ortamında ise yan yüzeydeki bireylerin, yerdeki besinlerden yeterince yararlanamaması nedeniyle iyi gelişemediği rapor edilmektedir. Bu kapsamda laboratuvar ortamında yürütülen çalışmada cam akvaryumlarda tutulan Holothuria tubulosa türü deniz hıyarı juvenilleri ve ergin bireylerinin yan yüzeye tutunma davranışına yaş grubu, stok yoğunluğu, ışık durumu, su seviyesi ve yan yüzeydeki besin miktarı faktörlerinin etkisi dijital davranış görüntülerinin sayısallaştırılması ile analiz edilmiştir. Çalışma sonuçlarına göre yan yüzeye tutunma davranışı juvenil bireylerde ergin bireylere göre daha sık görülmüştür. Stok yoğunuğu ile yan yüzeye tutunma arasında doğru yönlü ve güçlü bir ilişki bulunmaktadır. Deniz hıyarları juvenilleri düşük stok yoğunluğunda karanlık saatlerde daha çok yan yüzeyde görülürken yoğun stokta hem aydınlık hem de karanlık saatlerde yan yüzeyde yüksek oranda görülmektedirler. 10 cm su yüksekliği deniz hıyarlarının yan yüzeye tırmanmasını engellemekte olup su yüksekliği arttıkça tırmanan birey sayısında artış görülmüştür. Yan yüzeyde gelişen alg biyofilmi beslenme amaçlı olarak yan yüzeye tırmanmayı teşvik etmektedir.;Deniz hıyarı, Holothuria tubulosa, davranış, tutunma.;Sea cucumber, Holothuria tubulosa, behaviour, attaching.Öğe Determination of Hobbyist Preferences for Livebearer Ornamental Fish Attributes by Conjoint Analysis(2018) Tolon, Mustafa TolgaThis study investigates preferences of ornamental fish hobbyists on selected attributes of livebearer fish species guppy (Poecilia reticulate),golden swordtail (Xiphophorous hellerii), platy (Xiphophorous maculatus) and molly (Mollienesia spp.) using adaptive conjoint analysis. Computer-based surveys were conducted with 453 livebearer hobbyists in İzmir city (Turkey) between September and December, 2014. Results indicated the most important attributes are colour, price, species and size, which have significance for local livebearer producers, importers and retailers in planning their production and market strategies. Conjoint analysis determined price to be the second factor influencing the purchase behaviour of hobbyists’ with a 25% relative importance. Colour attribute is the leading factor by 28% relative importance. Multicolour, which is the most leading attribute level, got the highest part-worth score as 3.36. Market simulation indicated that nearly 62 % of the hobbyists’ like to purchase a medium size multicolour guppy with 1€/fish price and such favourite attribute combination would get nearly 42% of the livebearers market share. the overall results of this study indicate a promising market share for locally-bred livebearer fish in a variety of colours and sizes, but there is a considerable resistance to the price attribute which should be optimised by production and marketing strategies.Öğe Determination of Hobbyist Preferences for Livebearer Ornamental Fish Attributes by Conjoint Analysis(2018) Tolon, Mustafa TolgaThis study investigates preferences of ornamental fish hobbyists on selected attributes of livebearer fish species guppy (Poecilia reticulate),golden swordtail (Xiphophorous hellerii), platy (Xiphophorous maculatus) and molly (Mollienesia spp.) using adaptive conjoint analysis. Computer-based surveys were conducted with 453 livebearer hobbyists in İzmir city (Turkey) between September and December, 2014. Results indicated the most important attributes are colour, price, species and size, which have significance for local livebearer producers, importers and retailers in planning their production and market strategies. Conjoint analysis determined price to be the second factor influencing the purchase behaviour of hobbyists’ with a 25% relative importance. Colour attribute is the leading factor by 28% relative importance. Multicolour, which is the most leading attribute level, got the highest part-worth score as 3.36. Market simulation indicated that nearly 62 % of the hobbyists’ like to purchase a medium size multicolour guppy with 1€/fish price and such favourite attribute combination would get nearly 42% of the livebearers market share. The overall results of this study indicate a promising market share for locally-bred livebearer fish in a variety of colours and sizes, but there is a considerable resistance to the price attribute which should be optimised by production and marketing strategies.Öğe Determination of Hobbyist Preferences for Livebearer Ornamental Fish Attributes by Conjoint Analysis(Central Fisheries Research Inst, 2018) Tolon, Mustafa TolgaThis study investigates preferences of ornamental fish hobbyists on selected attributes of livebearer fish species guppy (Poecilia reticulate), golden swordtail (Xiphophorous hellerii), platy (Xiphophorous maculatus) and molly (Mollienesia spp.) using adaptive conjoint analysis. Computer-based surveys were conducted with 453 livebearer hobbyists in Izmir city (Turkey) between September and December, 2014. Results indicated the most important attributes are colour, price, species and size, which have significance for local livebearer producers, importers and retailers in planning their production and market strategies. Conjoint analysis determined price to be the second factor influencing the purchase behaviour of hobbyists' with a 25% relative importance. Colour attribute is the leading factor by 28% relative importance. Multicolour, which is the most leading attribute level, got the highest part-worth score as 3.36. Market simulation indicated that nearly 62 % of the hobbyists' like to purchase a medium size multicolour guppy with 1(sic)/fish price and such favourite attribute combination would get nearly 42% of the livebearers market share. The overall results of this study indicate a promising market share for locally-bred livebearer fish in a variety of colours and sizes, but there is a considerableresistance to the price attribute which should be optimised by production and marketing strategies.Öğe Effects of various stocking densities on hatching and survival rates of sea cucumber Holothuria tubulosa eggs (Gmelin, 1788)(2018) Günay, Deniz; Tolon, Mustafa Tolga; Emiroğlu, DilekIn this study, it was aimed to determine the opening and survival rates of Holothuria tubulosa eggs at four different stocking densities (1,5,15,30 eggs / ml) and to determine the effect of stocking density on egg size and larval size in different stages. Fertilized Holothuria tubulosa eggs were stocked in cylindrical conical collectors with a capacity of 30 l. Eggs were counted under light microscope at fertilization, early gastrulation, late gastrulation and hatching stages. It was found that there is an inverse relationship between stock intensity and opening rate (r = -0.848; p<0.001). The lowest hatching and survival rate was determined in 30 eggs / ml group (p <0.05). However, different stocking densities did not affect the diameter of the egg in different embryological stages (p> 0.05) and the length of early auricularia larva at 65 h (p> 0.05). As a result, the optimal stocking density for the highest hatching and survival rates of the fertilized eggs of Holothuria tubulosa was determined as 1-5 eggs / ml.Öğe Effects of various stocking densities on hatching and survival rates of sea cucumber Holothuria tubulosa eggs (Gmelin, 1788)(Ege Univ, Fac Fisheries, 2018) Gunay, Deniz; Tolon, Mustafa Tolga; Emiroglu, DilekIn this study, it was aimed to determine the opening and survival rates of Holothuria tubulosa eggs at four different stocking densities (15,1530 eggs / ml) and to determine the effect of stocking density on egg size and larval size in different stages. Fertilized Holothuria tubulosa eggs were stocked in cylindrical conical collectors with a capacity of 30 I. Eggs were counted under light microscope at fertilization, early gastrulation, late gastrulation and hatching stages. It was found that there is an inverse relationship between stock intensity and opening rate (r= -0.848; p<0.001). The lowest hatching and survival rate was determined in 30 eggs/ml group (p <0.05). However, different stocking densities did not affect the diameter of the egg in different embryological stages (p> 0.05) and the length of early auricularia larva at 65 h (p>0.05). As a result the optimal stocking density for the highest hatching and survival rates of the fertilized eggs of Holothuria tubulosa was determined as 1-5 eggs / ml.Öğe Evolution of Shellfish Breeding in Varano Lagoon(2001) Tolon, Mustafa Tolga; Sergıo, Pelosı; Massımo, Franchı; Francesco, Marolla…Öğe Gonadal development of the holothurian Holothuria polii (Delle Chiaje, 1823) in spawning period at the Aegean Sea (Mediterranean Sea)(2019) Tolon, Mustafa Tolga; Engin, SerhatThe Mediterranean Sea cucumbers including Holothuria polii has become commercially important in international trade due to the high demand of consumers from Far East countries. Sea cucumbers fisheries is a valuable income for the regional fishermen but natural stocks endangered by overfishing in recent years. Fisheries regulations and aquaculture studies are important precautions for preserving natural stocks. All these efforts are based on reproduction biology of this species which slightly differed among regions. In this study, the reproduction biology including morphological characteristics, gonadosomatic index and gonadal development stages of H.polii at the eastern coast of Aegean Sea (Izmir, Turkey) were investigated during the reproduction (spawning) period from July to October 2018. Gonads and gonad sections of 60 sea cucumbers (120.60 ± 19.56 g) have been observed by macroscopic and microscopic inspections. Three gonadal development stages have been identified by histologic observations as mature (III), spawning (IV) and post-spawning stage (V) in gonadal tubules. Results indicate that both female and male gonads are at mature and spawning stage in July and all gonads are at post-spawning stage in October. The mean gonad weight was 12.53 ± 1.33 g at the beginning of the spawning period (July) and 1.87 ± 0.58 g at the end of the spawning period (October). Gonadosomatic index decreased from 17.53 ± 0.02% (July) to 3.37 ± 0.01% (October) after spawning. The gonadosomatic index, gonad weight, and spawning were related to the seawater temperature. According to this study, the spawning period of H.polii at the eastern coasts of the Aegean Sea starts in July and completely ends in October. As a result, the data related to the reproduction biology in spawning period of H.polii would guide stock management and artificial breeding of this species under controlled conditionsÖğe Gonadal development of the holothurian Holothuria polii (Delle Chiaje, 1823) in spawning period at the Aegean Sea (Mediterranean Sea)(Ege Univ, Fac Fisheries, 2019) Tolon, Mustafa Tolga; Engin, SerhatThe Mediterranean Sea cucumbers including Holothuria polli has become commercially important in international trade due to the high demand of consumers from Far East countries. Sea cucumbers fisheries is a valuable income for the regional fishermen but natural stocks endangered by overfishing in recent years. Fisheries regulations and aquaculture studies are important precautions for preserving natural stocks. All these efforts are based on reproduction biology of this species which slightly differed among regions. in this study, the reproduction biology including morphological characteristics, gonadosomatic index and gonadal development stages of H.polii at the eastern coast of Aegean Sea (Izmir, Turkey) were investigated during the reproduction (spawning) period from July to October 2018. Gonads and gonad sections of 60 sea cucumbers (120.60 +/- 19.56 g) have been observed by macroscopic and microscopic inspections. Three gonadal development stages have been identified by histologic observations as mature (III), spawning (IV) and post-spawning stage (V) in gonadal tubules. Results indicate that both female and male gonads are at mature and spawning stage in July and all gonads are at post-spawning stage in October. the mean gonad weight was 12.53 +/- 1.33 g at the beginning of the spawning period (July) and 1.87 +/- 0.58 g at the end of the spawning period (October). Gonadosomatic index decreased from 17.53 +/- 0.02% (July) to 3.37 +/- 0.01% (October) after spawning. the gonadosomatic index, gonad weight, and spawning were related to the seawater temperature. According to this study, the spawning period of H.polii at the eastern coasts of the Aegean Sea starts in July and completely ends in October. As a result, the data related to the reproduction biology in spawning period of H.polii would guide stock management and artificial breeding of this species under controlled conditions.Öğe Gonadal development of the holothurian Holothuria polii (Delle Chiaje, 1823) in spawning period at the Aegean Sea (Mediterranean Sea)(2019) Tolon, Mustafa Tolga; Engin, Serhat…Öğe Growth and Survival Rate of Juvenile Sea Cucumbers (Holothuria tubulosa, Gmelin, 1788) at Various Temperatures(2015) Günay, Deniz; Emiroğlu, Dilek; Tolon, Mustafa Tolga; Özden, Osman; Sayğı, HülyaBu çalışmada, farklı su sıcaklıklarının deniz hıyarı (Holothuria tubulosa ) genç bireylerinin büyüme ve yaşama oranları üzerine etkileri araştırılmıştır. Ortalama 20,48±2,33 g ağırlıktaki genç H. tubulosa bireyleri Ege Denizi kıyılarından serbest dalış yöntemiyle elle toplanmıştır. Toplanan bireyler adapte edildikten sonra, laboratuar ortamında 45 gün boyuncadeniz suyu bulunan cam akvaryumlarda denemeye alınmıştır. Deniz hıyarlarının dağılım gösterdiği bölgedeki yaz ve kış deniz sıcaklıkları (en düşük ve en yüksek) sınır olmak üzere 4 farklı deniz suyu sıcaklığında (15, 20, 25 ve 30°C) deneme grupları oluşturulmuştur. Deneme süresince deniz hıyarları kurutulmuş kahverengi alg ile beslenmişlerdir. Deneme süresi sonunda en yüksek spesifik büyüme oranı (SBO) 0,288±0,02 % gün-1 olarak 25°C de kaydedilmiştir. En düşük spesifik büyüme oranı 0,085±0,005 % gün-1 değeri ile 30°C'de görülürken, 15°C'de negatif yönlü (-0,03±0,02 % gün-1) SBO kaydedilmiştir. Büyüme oranlarındaki düşük değerlerin 30°C'de gözlenen estivasyon (uyku) ve 15°C gözlenen hibernasyon davranışına bağlı olduğu düşünülmektedir. Tüm deneme gruplarında yaşama oranı %100 olup en iyi gelişim 25°C 'de tespit edilmiştir (P<0,05)Öğe Karadeniz Bölgesi nde toptan balık hallerinin yapısal ve pazarlama durumu(2015) Tolon, Mustafa Tolga; Günay, Deniz; Özden, Osman; Sayğı, Hülya; Emiroğlu, Dilek…Öğe Observation of Vibrio mediterranei (Pujalte and Garay 1986) / Vibrio shiloi (Kushmaro et al. 2001) bacteria from skin ulcers of the cultured sea cucumber Holothuria poli (Delle Chiaje, 1823)(Ege Univ, Fac Fisheries, 2021) Tolon, Mustafa Tolga; Karacalar, Ulviye; Sirin, CanerSkin ulcer syndrome is frequently reported as a serious disease affecting the health, growth and mortality of stocks in sea cucumber aquaculture. In this study, bacteria isolated predominantly from skin ulcers of sea cucumber Holothuria poli (Delle Chiaje, 1823), a new candidate for aquaculture in the Mediterranean, were investigated. Morphological and biochemical tests, and molecular analysis methods were used to examine the dominant bacteria in the lesions of H. poli showing skin ulceration, peristome tumour and visceral ejection symptoms in rearing tanks. Present study is the first report for isolation and identification of Vibrio mediterranei (Pujalte and Garay 1986) (called also Vibrio shiloi Kushmaro et al. 2001) as a predominant gram-negative bacterium in the skin ulcers of H. poli. Reference data provided from the present study would lead to understand possible major pathogens causing skin ulceration syndrome and is crucial for the prophylaxis and treatment of such disease in holothuriculture.Öğe Orta Doğu ve Türkiye’de İçsu Ürünleri Avcılığı ve Yetiştiriciliğinin Bugünkü Durumu ve Geleceğe Dair Tahminler(2018) Günay, Deniz; Emiroğlu, Dilek; Tolon, Mustafa TolgaBu çalışmada Türkiye’nin de içinde olduğu 16 Orta Doğu ülkesinin bugünkü ve gelecekteki iç su ürünleri avcılık ve yetiştiricilik üretimi, istatistik verileri yardımıyla değerlendirilmiştir. Trend analizi sonucunda 2015 yılında yaklaşık 390 000 ton olan Orta Doğu iç su avcılık üretiminin 2020 yılında 380 000 tona gerileyebileceği, 2015 yılında 1 660 000 ton olan yetiştiricilik üretiminin 2020 yılında yaklaşık 2 060 000 ton olabileceği tahmin edilmiştir. Türkiye’de ise toplam su ürünleri üretiminin 2016 yılı itibariyle %5,8 ‘ini oluşturan iç su ürünleri avcılığının 2020 yılında daha da azalacağı (30 000 ton), %17,2’sini oluşturan iç su ürünleri yetiştiriciliğinin ise artmaya devam edeceği (133 000 ton) öngörülmüştür. İç su ürünleri balıkçılığının sürdürülebilir olması ve sektörün gelişimi protein talebinin karşılanması ve sosyo-ekonomik gelişim açısından önemlidir.Öğe Orta Doğu ve Türkiye’de İçsu Ürünleri Avcılığı ve Yetiştiriciliğinin Bugünkü Durumu ve Geleceğe Dair Tahminler(2018) Günay, Deniz; Emiroğlu, Dilek; Tolon, Mustafa Tolga…Öğe A price index of farmed fish: The case of Turkish aquaculture market(Taylor & Francis Inc, 2023) Tolon, Mustafa TolgaThis study analyzed the market price dynamics of farmed fish using a price index in Turkey. A specific Price Index incorporating the leading aquaculture species produced by Turkish aquaculture, has been calculated for a five-year period spanning from 2016 to 2020. The empirical analysis is based on 60-month price and quantity data of chosen aquaculture species traded in a major wholesale fish market. Calculated prize index clearly indicates the noticeable effects of unusual economic and market dynamics on farmed fish prices. The significant increase in prices of agricultural inputs including aquafeed, electricity, fuel, maintenance of materials, and maintenance of buildings, as well as the impact of the Covid-19 pandemic in 2020, are the major factors influencing upward changes in price index. The Turkish Aquaculture Price Index is a practical tool that uses numerical expressions to reflect the periodic increase or decrease in the price of the aquaculture product commodity and makes significant contributions to understanding the price patterns and factors that have a cointegrated relation with the price changes in aquaculture market.Öğe Reproductive cycle of the temperate sea cucumber Holothuria tubulosa in the northeastern Aegean Sea(Wiley, 2024) Engin, Serhat; Tolon, Mustafa Tolga; Gunay, Deniz; Emiroglu, DilekObjective: The aim of this study was to determine the reproductive cycle and spawning frequency of the sea cucumber Holothuria tubulosa in the northeastern Aegean Sea. Methods: The study covered a period of 12 months, beginning in October 2018 and concluding in September 2019. During this period, sea cucumber samples were collected monthly. Macroscopic and histological examinations of gonadal tubules were conducted to provide credible information for fishery management and aquaculture. Result: The sex ratio of the sampled population was 1:1.3, with 95 males and 130 females. The drained body weights at 50% maturity were 70.90 g for females and 70.80 g for males. The total length at 50% maturity was estimated at 18.58 cm for females and 18.05 cm for males. Gonad maturation was initiated in March and progressed to spawning stages between July and August. From September to February, the gonads were in postspawning and recovery stages. A strong linear correlation was determined between the gonad index and the seawater temperature in the area. Conclusion: The information provided is expected to improve stock management, enforce fishery regulations, and support controlled breeding programs. These measures aim to preserve the natural populations of Holothuria tubulosa and guarantee the long-term viability of the species in the wild.Öğe Sea cucumber (Holothuria tubulosa Gmelin, 1790) culture under marine fish net cages for potential use in integrated multi-trophic aquaculture (IMTA)(Natl Inst Science Communication-Niscair, 2017) Tolon, Mustafa Tolga; Emiroglu, Dilek; Gunay, Deniz; Ozgul, AytacIn this study, integrated aquaculture of Mediterranean sea cucumber species Holothuria tubulosa under finfish net cages was investigated. To evaluate whether H.tubulosa can be reared under net cage farms without additional feed and to compare growth performances, three underwater ranches (10x10m), just below a net cage (A), between the net cages (B) and 750 m away from the net cage systems (K) were set. Fifty sea cucumbers (92.81 +/- 2.29 g) were placed into each research station and growth performances like specific growth rate (SGR) and weight gain were observed for 90 days. SGR of sea cucumbers in stations A, B and K were 0.3 +/- 0.04, 0.22 +/- 0.02 and 0.10 +/- 0.01 %/d, respectively. The highest mean weight gain 31.11 +/- 0.84 g was recorded at station A where the lowest was in station K as 8.89 +/- 0.12 g. Organic carbon and organic material amount of research stations significantly affected the final mean weights of sea cucumbers where the highest growth was determined at the stations A and B. The results suggest that integrated multi-trophic aquaculture (IMTA) systems combined with finfish and sea cucumber H. tubulosa under net cages would provide by-products to aquaculture farms without an extra feed costs in the Mediterranean Sea.Öğe Türkiye balık yem sanayisinin gelişimi(2019) Emiroğlu, Dilek; Tolon, Mustafa Tolga; Günay, Deniz; Yapıcı, Serenay NurTürkiye’de su ürünleri yetiştiriciliği sektörünün son yıllarda hızlı bir gelişim göstermesine bağlı olarak balık yemine olan talep de önemli ölçüde artmıştır. Su ürünleri yetiştiricilik işletmelerinin sayılarının ve üretim miktarlarının giderek artması, beraberinde balık yemi talebinin artışı, su ürünleri yem sanayinin gelişmesini teşvik etmektedir. 1999’da yetiştiricilik yoluyla üretim yaklaşık 60 bin ton iken balık yemi üretimi 38000 ton, 2015 yılında ise su ürünleri yetiştiricilik üretimi 240 bin ton iken balık yemi üretimi 375000 ton olarak kaydedilmiştir. 1999-2016 yılları arasında su ürünleri yetiştiricilik üretimi miktarı yaklaşık 4,5 kat artarken, balık yemi üretimi yaklaşık 12 kat artış göstermiştir. Bu çalışmada Türkiye’deki balık yemi sanayinin gelişimi değerlendirilmiştir. Günümüzde Türkiye’de 23 adet balık yemi üretimi yapan işletme bulunmaktadır. Bu işletmelerin % 70’i, 30 bin ton ve altında üretim gerçekleştirmektedir. Bu araştırmada 30 bin ton ve altı üretim yapan işletmeler araştırma kapsamına alınmış ve bu işletmelerin yönetimindeki yetkili kişilerle telefon anketi gerçekleştirilmiştir. Anket çalışması sonucunda elde edilen veriler değerlendirildiğinde araştırma kapsamındaki işletmelerin % 63’ünün üretim miktarının 10 bin ton ile 30 bin ton arasında olduğu belirlenmiştir. İşletmelerin % 56’sının sadece balık yemi üretimi yaptığı tespit edilmiştir. Araştırma kapsamındaki firma yetkililerinin hepsi balık yem sanayisinin gelişimini sürdüreceği görüşündedir. Çalışmada 1999-2016 yılları arasındaki 18 yıllık üretim değerleri esas alınarak yapılan üretim miktarı öngörüsüne göre de 2021 yılında su ürünleri yetiştiricilik üretiminin 310268 tona, balık yemi üretiminin ise 585418 tona ulaşacağı beklenmektedir.
