Su Ürünleri Yetiştiriciliği Bölümü Koleksiyonu

Critical temperatures and aerobic metabolism in post-larvae of Pacific white shrimp Litopenaeus vannamei (Boone, 1931)

2023-10-26T13:42:23Z

Critical temperatures and aerobic metabolism in post-larvae of Pacific white shrimp Litopenaeus vannamei (Boone, 1931) Topuz, Mustafa; Kır, Mehmet Increasing water temperature because of climate change decreases the oxygen concentration while increasing the oxygen requirement of species in aquatic environments. Temperature is one of the most important environmental factors affecting the physiological functions of organisms, especially poikilothermic animals, such as shrimp at all levels. In intensive shrimp culture, it is of great importance to know the tolerable temperature range of cultured species and their metabolism since this affects the physiological condition. In this study, critical temperatures (CTM: CTmin and CTmax) of Pacific white shrimp, Litopenaeus vannamei, post-larvae (PL), were determined at different acclimation temperatures of 15, 20, 25, and 30 °C. Lower and upper incipient lethal temperatures (ILT: LILT and UILT) were also calculated for the PL. The thermal windows of the PL were developed using the CTM and ILT values. The standard metabolic rate (SMR) of the PL was determined based on the oxygen consumption rate (OCR) at the different acclimation temperatures mentioned above. The acclimation temperature had a subsequent effect on the thermal tolerance and SMR of the PL (P < 0.01). The PLs of Pacific white shrimp have high thermal tolerance and can survive at extreme temperatures (CTmin and CTmax: 8.2–43.8 °C) with their large dynamic and static thermal window areas of 1128 and 931 °C2, respectively. The optimal temperature range for Pacific white shrimp PLs is the 25–30 °C range, where a decrease in SMR is determined with increasing temperature. The result of this study reveals that a range of 25–30 °C is optimal for effective PL culture of Pacific white shrimp

Is the Nutritional Composition of Safflower Oilseed Meal Sufficient for Alternative or Complementary Aqua Feeds-raw Material? Send mail to Yildirim Ö.;

2023-10-11T08:38:10Z

Is the Nutritional Composition of Safflower Oilseed Meal Sufficient for Alternative or Complementary Aqua Feeds-raw Material? Send mail to Yildirim Ö.; Yıldırım, Önder; Çantaş, İsmail Berat Safflower (Carthamus tinctorius L.) is grown in many countries, even in arid regions. Due to its important nutrients, safflower has the potential to be used as raw material for the nutrition of many animals and aquaculture species. For this reason, the objective of this study is to determine crude protein, crude oil, ash, and nitrogen-free extract (NFE) values, as well as amino acid, fatty acid, and mineral values in safflower seed meal. In addition, fish meal, soybean meal, wheat, and canola meal values are compared with safflower seed. On a dry matter basis, the crude protein, crude oil, crude ash, and NFE values were found at 19.42% ±0.32, 8.76% ±0.21, 2.82% ±0.1, and 62.68% ±0.88 respectively. Safflower meal contains significant arginine, histidine, and phenylalanine levels, with C18:2 n-6 being one of the most abundant fatty acids. According to the fatty acid values examined, the total saturated fatty acid values were to be 9.79%; the total monounsaturated fatty acid values are 27.58%; total n-6 PUFA values are 61.49%; total n-3 fatty acid values are 0.55% and total n-3 HUFA values are 0.22% in safflower oilseed meal. The potassium and magnesium content in safflower seed meal is similar to that of soybean meal and fishmeal. Safflower oilseed meal or oil can be used as complementary feedstuff in both marine and freshwater fish feeds. In future studies, observing the balance of essential amino acids and polyunsaturated fatty acids and conducting detailed studies will be effective in closing the gap in this area.

Unpublished Mediterranean and Black Sea records of marine alien, cryptogenic, and neonative species

2023-08-07T12:36:00Z

Unpublished Mediterranean and Black Sea records of marine alien, cryptogenic, and neonative species Türker, Ali; Ragkousis, Michail; Zenetos, Argyro; Souissi, Jamila Ben To enrich spatio-temporal information on the distribution of alien, cryptogenic, and neonative species in the Mediterranean and the Black Sea, a collective effort by 173 marine scientists was made to provide unpublished records and make them open access to the scientific community. Through this effort, we collected and harmonized a dataset of 12,649 records. It includes 247 taxa, of which 217 are Animalia, 25 Plantae and 5 Chromista, from 23 countries surrounding the Mediterranean and the Black Sea. Chordata was the most abundant taxonomic group, followed by Arthropoda, Mollusca, and Annelida. In terms of species records, Siganus luridus, Siganus rivulatus, Saurida lessepsianus, Pterois miles, Upeneus moluccensis, Charybdis (Archias) longicollis, and Caulerpa cylindracea were the most numerous. The temporal distribution of the records ranges from 1973 to 2022, with 44% of the records in 2020–2021. Lethrinus borbonicus is reported for the first time in the Mediterranean Sea, while Pomatoschistus quagga, Caulerpa cylindracea, Grateloupia turuturu, and Misophria pallida are first records for the Black Sea; Kapraunia schneideri is recorded for the second time in the Mediterranean and for the first time in Israel; Prionospio depauperata and Pseudonereis anomala are reported for the first time from the Sea of Marmara. Many first country records are also included, namely: Amathia verticillata (Montenegro), Ampithoe valida (Italy), Antithamnion amphigeneum (Greece), Clavelina oblonga (Tunisia and Slovenia), Dendostrea cf. folium (Syria), Epinephelus fasciatus (Tunisia), Ganonema farinosum (Montenegro), Macrorhynchia philippina (Tunisia), Marenzelleria neglecta (Romania), Paratapes textilis (Tunisia), and Botrylloides diegensis (Tunisia).

Discovery and DNA analysis of the invasive freshwater mussel Sinanodonta lauta (Unionidae) in south Iran

2023-08-03T12:27:45Z

Discovery and DNA analysis of the invasive freshwater mussel Sinanodonta lauta (Unionidae) in south Iran Alwanzadegan, Kazem; Kashiri, Hadise; Bolotov, Ivan N.; Ercan, Ertan; Shirangi, Ainaz Some members of the genus Sinanodonta (Modell, 1944) are known as successful invaders of freshwater habitats. Here we report the first record of Sinanodonta lauta (Martens, 1877) from Iran and provide morphological and molecular data on this alien population. This species was observed in the Dez River and a fish farm in Khuzestan, south of Iran. The S. lauta introduction seems to be closely related to the introduction of Asian carps from East Asia. The individuals collected from the river exhibited two COI haplotypes, probably due to several introduction events of host fish. Based on our haplotype network, the alien individuals found in Iran is closer to the native ones from South Korea (two-three substitutions) compared to other native individuals reported from Japan and Russian Far East. The presence of 10-11 years old specimens in Dez River shows that the species can survive well in the natural environment of southern Iran. Further expansion and colonization of S. lauta in south Iran or beyond it are not unexpected due to some human-mediated dispersal events as well as waterways in the region.