Mehmet Kır - Academia.edu (original) (raw)

Papers by Mehmet Kır

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

Journal of Comparative Physiology B

Research paper thumbnail of Thermal Acclimation Capacity and Standard Metabolism of Pacific White Shrimp, Litopenaeus Vannamei (Boone, 1931) at Different Temperature and Salinity Combinationsthermal Acclimation Capacity and Standard Metabolism of Pacific White Shrimp, Litopenaeus Vannamei (Boone, 1931) at Different Temperat...

Research paper thumbnail of Gökkuşağı Alabalığı (Oncorhynchus mykiss Walbaum, 1792) Yavrularında Ağırlık ve Akut Amonyak Toksisitesi İlişkisi

Süleyman Demirel Üniversitesi Eğirdir Su Ürünleri Fakültesi dergisi, Jan 4, 2006

Bu çalışmada, üç farklı büyüklükte (1, 5 ve 10 g) gökkuşağı alabalığı (Oncorhynchus mykiss) yavru... more Bu çalışmada, üç farklı büyüklükte (1, 5 ve 10 g) gökkuşağı alabalığı (Oncorhynchus mykiss) yavrularının, 13°C su sıcaklığında ve pH 7.0 seviyesinde, amonyak LC 50 değerleri tespit edilmiştir. Ayrıca balık büyüklüğü ile türün 24, 48, 72 ve 96 saatlik amonyak LC 50 değerleri arasındaki ilişki belirlenmiştir. Toplam Amonyak Nitrojeni (TAN) için 96 saatlik LC 50 değerleri 1, 5 ve 10 g balık yavrularında, sırasıyla 10.57 mg/L, 3.39 mg/L ve 2.50 mg/L olarak tespit edilmiştir. Her ağırlık grubu için, güvenli üst TAN seviyesi sırasıyla 1.05 mg/L, 0.33 mg/L ve 0.25 mg/L olarak hesaplanmıştır. Çalışma sonuçları balık ağırlığının artmasıyla amonyak LC 50 değerinin azaldığını göstermiştir.

Research paper thumbnail of Thermal acclimation capacity and standard metabolism of the Pacific white shrimp Litopenaeus vannamei (Boone, 1931) at different temperature and salinity combinations

Journal of Thermal Biology

Research paper thumbnail of Yeşil kaplan karidesi (Penaeus semisulcatus)'nin soğuğa toleransı ve kışlatılma olanakları

TEZ5014Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2004.Kaynakça (s. 89-102) var.ix, 101 s. ; ... more TEZ5014Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2004.Kaynakça (s. 89-102) var.ix, 101 s. ; 30 cm.

Research paper thumbnail of Acute Toxicity of Ammonia and Nitrite to Sea Bream, Sparus aurata (Linnaeus, 1758), in Relation to Salinity

Journal of the World Aquaculture Society, 2017

Sea bream, Sparus aurata, is one of the most important fish species that is commonly cultured in ... more Sea bream, Sparus aurata, is one of the most important fish species that is commonly cultured in the Mediterranean and the eastern coasts of the Atlantic Ocean. The life cycle of sea bream in its natural habitat passes through hyposaline and hypersaline lagoons. It is important to determine the tolerance of the fish to nitrogenous compounds for aquaculture at maximum stocking densities. In the present study, a series of acute experiments were performed to evaluate the effect of salinity on ammonia and nitrite toxicity to sea bream. The fish were exposed to different ammonia and nitrite concentrations according to the static renewal methodology at three different salinities (10, 20, and 30 ppt) and at a temperature of 20 C and a pH of 8.2. The toxic effect of total ammonia nitrogen (TAN) and nitrite nitrogen (NO 2-N) decreased with increasing salinity levels (P < 0.001). Acute toxicity (96-h lethal concentration 50 [LC 50 ]) values of TAN were determined to be 5.93, 11.72, and 19.38 mg/L at 10, 20, and 30 ppt salinity, respectively. The 96-h LC 50 values of NO 2-N were determined to be 370.80, 619.47, and 806.33 mg/L at 10, 20, and 30 ppt salinity, respectively. Results indicate that sea bream is less tolerant to ammonia but more tolerant to nitrite compared with some other fish species.

Research paper thumbnail of Effect of Temperature on Acute Toxicity of Nitrite to Meagre, Argyrosomus regius (Asso, 1801)

Journal of the World Aquaculture Society, 2015

Meagre, Argyrosomus regius, is a candidate marine fish species for aquaculture diversification, p... more Meagre, Argyrosomus regius, is a candidate marine fish species for aquaculture diversification, presenting a high economic value in the Mediterranean. Tolerance of juvenile meagre to nitrite (NO 2-N) was determined relating to temperature. Fish (3.2 ± 0.6 g and 5.4 ± 0.9 cm) were exposed to different NO 2-N concentrations in a series of acute toxicity tests by the static renewal method at three temperatures (18, 22, and 26 C) at a pH of 8.0. Low temperature clearly increased tolerance to NO 2-N (P < 0.05). The 96-h median lethal concentration (LC 50) values of NO 2-N were 177.63, 139.55, and 49.61 mg/L, at 18, 22, and 26 C, respectively. The safe levels of NO 2-N for juvenile meagre were estimated to be 17.7, 13.9, and 4.9 mg/L at 18, 22, and 26 C, respectively (P < 0.05). This study indicates A. regius is more sensitive to nitrite than other marine fish species cultured in the Mediterranean.

Research paper thumbnail of Acute toxicity of ammonia in Meagre ( Argyrosomus regius Asso, 1801) at different temperatures

Aquaculture Research, 2015

Argyrosomus regius (3.0 ± 0.9 g) were exposed to different concentrations of ammonia in a series ... more Argyrosomus regius (3.0 ± 0.9 g) were exposed to different concentrations of ammonia in a series of acute toxicity tests by the static renewal method at three temperature levels (18, 22 and 26°C) at a pH of 8.2. Low temperature clearly increased the tolerance of the fish to total ammonia nitrogen (TAN) and unionized ammonia (NH3) (P < 0.05). While the 96-h LC50 values of TAN were 19.79, 10.39 and 5.06 mg L−1, the 96-h LC50 of NH3 were 1.00, 0.70 and 0.44 mg L−1 at 18, 22 and 26°C respectively. The safe levels of NH3 for A. regius was estimated to be 0.10, 0.07 and 0.04 mg L−1 at 18, 22 and 26°C respectively (P < 0.05). This study clearly indicates that A. regius is more sensitive to ammonia than other marine fish species cultured on the Mediterranean and Eastern Atlantic coasts.

Research paper thumbnail of Enhancement of growth and feed utilization of the European sea bass (Dicentrarchus labrax) fed supplementary dietary salt in freshwater

Aquaculture Research, 2005

The European sea bass (Dicentrarchus labrax L.) is an economically important euryhaline marine fi... more The European sea bass (Dicentrarchus labrax L.) is an economically important euryhaline marine fish that frequently inhabits coastal waters of the Mediterranean Sea and is capable of tolerating both hypersaline and freshwater (FW) environments (Eroldoğan & Kumlu 2002; ...

Research paper thumbnail of Effect of temperature and salinity on low thermal tolerance of Penaeus semisulcatus (Decapoda: Penaeidae)

Aquaculture Research, 2008

... Díaz-Herrera F., Sierra-Uribe E., Buckle-Ramírez LF &amp;amp; Garrido-Mora A. (1998) Crit... more ... Díaz-Herrera F., Sierra-Uribe E., Buckle-Ramírez LF &amp;amp; Garrido-Mora A. (1998) Critical thermal maxima and minima of Macrobrachium ... CrossRef. Manush SM, Pal AK, Chatterje N., Das T. &amp;amp; Mukherjee SC (2004) Thermal tolerance and oxygen consumption of Macrobrachium ...

Research paper thumbnail of Effects of temperature on acute toxicity of ammonia to Penaeus semisulcatus juveniles

Aquaculture, 2004

In addition to modulating the function and stability of cellular mRNAs, microRNAs can profoundly ... more In addition to modulating the function and stability of cellular mRNAs, microRNAs can profoundly affect the life cycles of viruses bearing sequence complementary targets, a finding recently exploited to ameliorate toxicities of vaccines and oncolytic viruses. To elucidate the mechanisms underlying microRNA-mediated antiviral activity, we modified the 39 untranslated region (39UTR) of Coxsackievirus A21 to incorporate targets with varying degrees of homology to endogenous microRNAs. We show that microRNAs can interrupt the picornavirus life-cycle at multiple levels, including catalytic degradation of the viral RNA genome, suppression of cap-independent mRNA translation, and interference with genome encapsidation. In addition, we have examined the extent to which endogenous microRNAs can suppress viral replication in vivo and how viruses can overcome this inhibition by microRNA saturation in mouse cancer models.

Research paper thumbnail of Growth of Over-wintered and Pre-seasonally Produced Post-larvae of Penaeus semisulcatus in the Subtropics

Turkish Journal of Fisheries and Aquatic Sciences

Growth performance of Penaeus semisulcatus under semi-intensive and intensive systems in pond/tan... more Growth performance of Penaeus semisulcatus under semi-intensive and intensive systems in pond/tank culture conditions with pre-seasonally or over-wintered animals was studied in sub-tropical climate conditions of Turkey. In Pond A, the pre-seasonally produced post-larvae (PL) grew linearly from 0.2 g to 22.6 g in 140 days (Y = 0.19 X- 2.69; R2 = 0.97) with DGR (daily growth rate) of 0.06 g day-1. In Pond B, the over-wintered juveniles grew from 3.8 g to 30.5 g with DGR of 0.41 g during the first 30 days (weight gain of 14.42 g) and 0.13 g between 30 and 140 days (weight gain of 14.32 g). Regression equation for growth was calculated to be Y = 9.62 Log (X) + 4.51 (R2 = 0.99). Compensatory growth due to starvation or over-winter fasting has, for the first time, been demonstrated in this penaeid shrimp species in the present study. Food deprivation during the winter months resulted in growth compensation after refeeding under appropriate culture conditions. During the compensatory grow...

Research paper thumbnail of A New Extension of Some Well Known Fixed Point Theorems in Metric Spaces

Mathematical Sciences Letters, 2014

Research paper thumbnail of Thermal tolerance of Acartia tonsa: In relation to acclimation temperature and life stage

Journal of Thermal Biology, 2021

Research paper thumbnail of Thermal tolerance and standard metabolic rate of juvenile gilthead seabream (Sparus aurata) acclimated to four temperatures

Journal of Thermal Biology

Research paper thumbnail of Acute ammonia toxicity and the interactive effects of ammonia and salinity on the standard metabolism of European sea bass (Dicentrarchus labrax)

Research paper thumbnail of Thermal tolerance and standard metabolic rate of juvenile European sea bass (Dicentrarchus labrax, Linnaeus, 1758) acclimated to four temperatures

Journal of Thermal Biology

Research paper thumbnail of Acute Toxicity of Ammonia to Penaeus semisulcatus Postlarvae in Relation to Salinity

Journal of the World Aquaculture Society, 2006

Research paper thumbnail of Influence of neuropeptide Y (NPY) on food intake and growth of penaeid shrimps Marsupenaeus japonicus and Penaeus semisulcatus (Decapoda: Penaeidae)

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2004

The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of... more The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of two penaeid species were investigated in this study. In experiment 1, food intake (FI) of Marsupenaeus japonicus PLs (0.96 g), injected with NPY at 0.6 Ag per g BW, was investigated within 48 h posttreatment. In experiment 2, oral administration of NPY (at doses of 0, 0.125, 0.25, 0.5 Ag g À1 food) on feed intake and growth performance of Penaeus semisulcatus PLs (0.27 g) was examined for 6 weeks. In experiment 1, NPY injection significantly increased average daily FI of M. japonicus PLs within the first 24 h compared to the control (Pb0.05), but its stimulatory effect decreased on the second day (PN0.05). The increase in FI was 33% during the first 24 h and 17% during the next 24 h. In experiment 2, significant (Pb0.05) differences were found among the groups in terms of weight gain and food utilization (Pb0.05). Mean FI significantly increased (as much as 1.3-fold over the control) when NPY was orally administered at doses from 0.125 to 0.5 Ag g À1 feed. There was a positive relationship between FI and final weight (y=À0.972+2.098x, R 2 =0.81) and between FCE and NPY doses in the diets (y=45.37+3.46x, R 2 =0.91). The present findings indicated for the first time that NPY is a potent stimulator of food intake when administered either intramuscularly or orally to penaeid shrimps.

Research paper thumbnail of Influence of neuropeptide Y (NPY) on food intake and growth of penaeid shrimps Marsupenaeus japonicus and Penaeus semisulcatus (Decapoda: Penaeidae)

Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 2004

The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of... more The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of two penaeid species were investigated in this study. In experiment 1, food intake (FI) of Marsupenaeus japonicus PLs (0.96 g), injected with NPY at 0.6 microg per g BW, was investigated within 48 h posttreatment. In experiment 2, oral administration of NPY (at doses of 0, 0.125, 0.25, 0.5 microg g(-1) food) on feed intake and growth performance of Penaeus semisulcatus PLs (0.27 g) was examined for 6 weeks. In experiment 1, NPY injection significantly increased average daily FI of M. japonicus PLs within the first 24 h compared to the control (P<0.05), but its stimulatory effect decreased on the second day (P>0.05). The increase in FI was 33% during the first 24 h and 17% during the next 24 h. In experiment 2, significant (P<0.05) differences were found among the groups in terms of weight gain and food utilization (P<0.05). Mean FI significantly increased (as much as 1.3-fold...

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

Journal of Comparative Physiology B

Research paper thumbnail of Thermal Acclimation Capacity and Standard Metabolism of Pacific White Shrimp, Litopenaeus Vannamei (Boone, 1931) at Different Temperature and Salinity Combinationsthermal Acclimation Capacity and Standard Metabolism of Pacific White Shrimp, Litopenaeus Vannamei (Boone, 1931) at Different Temperat...

Research paper thumbnail of Gökkuşağı Alabalığı (Oncorhynchus mykiss Walbaum, 1792) Yavrularında Ağırlık ve Akut Amonyak Toksisitesi İlişkisi

Süleyman Demirel Üniversitesi Eğirdir Su Ürünleri Fakültesi dergisi, Jan 4, 2006

Bu çalışmada, üç farklı büyüklükte (1, 5 ve 10 g) gökkuşağı alabalığı (Oncorhynchus mykiss) yavru... more Bu çalışmada, üç farklı büyüklükte (1, 5 ve 10 g) gökkuşağı alabalığı (Oncorhynchus mykiss) yavrularının, 13°C su sıcaklığında ve pH 7.0 seviyesinde, amonyak LC 50 değerleri tespit edilmiştir. Ayrıca balık büyüklüğü ile türün 24, 48, 72 ve 96 saatlik amonyak LC 50 değerleri arasındaki ilişki belirlenmiştir. Toplam Amonyak Nitrojeni (TAN) için 96 saatlik LC 50 değerleri 1, 5 ve 10 g balık yavrularında, sırasıyla 10.57 mg/L, 3.39 mg/L ve 2.50 mg/L olarak tespit edilmiştir. Her ağırlık grubu için, güvenli üst TAN seviyesi sırasıyla 1.05 mg/L, 0.33 mg/L ve 0.25 mg/L olarak hesaplanmıştır. Çalışma sonuçları balık ağırlığının artmasıyla amonyak LC 50 değerinin azaldığını göstermiştir.

Research paper thumbnail of Thermal acclimation capacity and standard metabolism of the Pacific white shrimp Litopenaeus vannamei (Boone, 1931) at different temperature and salinity combinations

Journal of Thermal Biology

Research paper thumbnail of Yeşil kaplan karidesi (Penaeus semisulcatus)'nin soğuğa toleransı ve kışlatılma olanakları

TEZ5014Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2004.Kaynakça (s. 89-102) var.ix, 101 s. ; ... more TEZ5014Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2004.Kaynakça (s. 89-102) var.ix, 101 s. ; 30 cm.

Research paper thumbnail of Acute Toxicity of Ammonia and Nitrite to Sea Bream, Sparus aurata (Linnaeus, 1758), in Relation to Salinity

Journal of the World Aquaculture Society, 2017

Sea bream, Sparus aurata, is one of the most important fish species that is commonly cultured in ... more Sea bream, Sparus aurata, is one of the most important fish species that is commonly cultured in the Mediterranean and the eastern coasts of the Atlantic Ocean. The life cycle of sea bream in its natural habitat passes through hyposaline and hypersaline lagoons. It is important to determine the tolerance of the fish to nitrogenous compounds for aquaculture at maximum stocking densities. In the present study, a series of acute experiments were performed to evaluate the effect of salinity on ammonia and nitrite toxicity to sea bream. The fish were exposed to different ammonia and nitrite concentrations according to the static renewal methodology at three different salinities (10, 20, and 30 ppt) and at a temperature of 20 C and a pH of 8.2. The toxic effect of total ammonia nitrogen (TAN) and nitrite nitrogen (NO 2-N) decreased with increasing salinity levels (P < 0.001). Acute toxicity (96-h lethal concentration 50 [LC 50 ]) values of TAN were determined to be 5.93, 11.72, and 19.38 mg/L at 10, 20, and 30 ppt salinity, respectively. The 96-h LC 50 values of NO 2-N were determined to be 370.80, 619.47, and 806.33 mg/L at 10, 20, and 30 ppt salinity, respectively. Results indicate that sea bream is less tolerant to ammonia but more tolerant to nitrite compared with some other fish species.

Research paper thumbnail of Effect of Temperature on Acute Toxicity of Nitrite to Meagre, Argyrosomus regius (Asso, 1801)

Journal of the World Aquaculture Society, 2015

Meagre, Argyrosomus regius, is a candidate marine fish species for aquaculture diversification, p... more Meagre, Argyrosomus regius, is a candidate marine fish species for aquaculture diversification, presenting a high economic value in the Mediterranean. Tolerance of juvenile meagre to nitrite (NO 2-N) was determined relating to temperature. Fish (3.2 ± 0.6 g and 5.4 ± 0.9 cm) were exposed to different NO 2-N concentrations in a series of acute toxicity tests by the static renewal method at three temperatures (18, 22, and 26 C) at a pH of 8.0. Low temperature clearly increased tolerance to NO 2-N (P < 0.05). The 96-h median lethal concentration (LC 50) values of NO 2-N were 177.63, 139.55, and 49.61 mg/L, at 18, 22, and 26 C, respectively. The safe levels of NO 2-N for juvenile meagre were estimated to be 17.7, 13.9, and 4.9 mg/L at 18, 22, and 26 C, respectively (P < 0.05). This study indicates A. regius is more sensitive to nitrite than other marine fish species cultured in the Mediterranean.

Research paper thumbnail of Acute toxicity of ammonia in Meagre ( Argyrosomus regius Asso, 1801) at different temperatures

Aquaculture Research, 2015

Argyrosomus regius (3.0 ± 0.9 g) were exposed to different concentrations of ammonia in a series ... more Argyrosomus regius (3.0 ± 0.9 g) were exposed to different concentrations of ammonia in a series of acute toxicity tests by the static renewal method at three temperature levels (18, 22 and 26°C) at a pH of 8.2. Low temperature clearly increased the tolerance of the fish to total ammonia nitrogen (TAN) and unionized ammonia (NH3) (P < 0.05). While the 96-h LC50 values of TAN were 19.79, 10.39 and 5.06 mg L−1, the 96-h LC50 of NH3 were 1.00, 0.70 and 0.44 mg L−1 at 18, 22 and 26°C respectively. The safe levels of NH3 for A. regius was estimated to be 0.10, 0.07 and 0.04 mg L−1 at 18, 22 and 26°C respectively (P < 0.05). This study clearly indicates that A. regius is more sensitive to ammonia than other marine fish species cultured on the Mediterranean and Eastern Atlantic coasts.

Research paper thumbnail of Enhancement of growth and feed utilization of the European sea bass (Dicentrarchus labrax) fed supplementary dietary salt in freshwater

Aquaculture Research, 2005

The European sea bass (Dicentrarchus labrax L.) is an economically important euryhaline marine fi... more The European sea bass (Dicentrarchus labrax L.) is an economically important euryhaline marine fish that frequently inhabits coastal waters of the Mediterranean Sea and is capable of tolerating both hypersaline and freshwater (FW) environments (Eroldoğan & Kumlu 2002; ...

Research paper thumbnail of Effect of temperature and salinity on low thermal tolerance of Penaeus semisulcatus (Decapoda: Penaeidae)

Aquaculture Research, 2008

... Díaz-Herrera F., Sierra-Uribe E., Buckle-Ramírez LF &amp;amp; Garrido-Mora A. (1998) Crit... more ... Díaz-Herrera F., Sierra-Uribe E., Buckle-Ramírez LF &amp;amp; Garrido-Mora A. (1998) Critical thermal maxima and minima of Macrobrachium ... CrossRef. Manush SM, Pal AK, Chatterje N., Das T. &amp;amp; Mukherjee SC (2004) Thermal tolerance and oxygen consumption of Macrobrachium ...

Research paper thumbnail of Effects of temperature on acute toxicity of ammonia to Penaeus semisulcatus juveniles

Aquaculture, 2004

In addition to modulating the function and stability of cellular mRNAs, microRNAs can profoundly ... more In addition to modulating the function and stability of cellular mRNAs, microRNAs can profoundly affect the life cycles of viruses bearing sequence complementary targets, a finding recently exploited to ameliorate toxicities of vaccines and oncolytic viruses. To elucidate the mechanisms underlying microRNA-mediated antiviral activity, we modified the 39 untranslated region (39UTR) of Coxsackievirus A21 to incorporate targets with varying degrees of homology to endogenous microRNAs. We show that microRNAs can interrupt the picornavirus life-cycle at multiple levels, including catalytic degradation of the viral RNA genome, suppression of cap-independent mRNA translation, and interference with genome encapsidation. In addition, we have examined the extent to which endogenous microRNAs can suppress viral replication in vivo and how viruses can overcome this inhibition by microRNA saturation in mouse cancer models.

Research paper thumbnail of Growth of Over-wintered and Pre-seasonally Produced Post-larvae of Penaeus semisulcatus in the Subtropics

Turkish Journal of Fisheries and Aquatic Sciences

Growth performance of Penaeus semisulcatus under semi-intensive and intensive systems in pond/tan... more Growth performance of Penaeus semisulcatus under semi-intensive and intensive systems in pond/tank culture conditions with pre-seasonally or over-wintered animals was studied in sub-tropical climate conditions of Turkey. In Pond A, the pre-seasonally produced post-larvae (PL) grew linearly from 0.2 g to 22.6 g in 140 days (Y = 0.19 X- 2.69; R2 = 0.97) with DGR (daily growth rate) of 0.06 g day-1. In Pond B, the over-wintered juveniles grew from 3.8 g to 30.5 g with DGR of 0.41 g during the first 30 days (weight gain of 14.42 g) and 0.13 g between 30 and 140 days (weight gain of 14.32 g). Regression equation for growth was calculated to be Y = 9.62 Log (X) + 4.51 (R2 = 0.99). Compensatory growth due to starvation or over-winter fasting has, for the first time, been demonstrated in this penaeid shrimp species in the present study. Food deprivation during the winter months resulted in growth compensation after refeeding under appropriate culture conditions. During the compensatory grow...

Research paper thumbnail of A New Extension of Some Well Known Fixed Point Theorems in Metric Spaces

Mathematical Sciences Letters, 2014

Research paper thumbnail of Thermal tolerance of Acartia tonsa: In relation to acclimation temperature and life stage

Journal of Thermal Biology, 2021

Research paper thumbnail of Thermal tolerance and standard metabolic rate of juvenile gilthead seabream (Sparus aurata) acclimated to four temperatures

Journal of Thermal Biology

Research paper thumbnail of Acute ammonia toxicity and the interactive effects of ammonia and salinity on the standard metabolism of European sea bass (Dicentrarchus labrax)

Research paper thumbnail of Thermal tolerance and standard metabolic rate of juvenile European sea bass (Dicentrarchus labrax, Linnaeus, 1758) acclimated to four temperatures

Journal of Thermal Biology

Research paper thumbnail of Acute Toxicity of Ammonia to Penaeus semisulcatus Postlarvae in Relation to Salinity

Journal of the World Aquaculture Society, 2006

Research paper thumbnail of Influence of neuropeptide Y (NPY) on food intake and growth of penaeid shrimps Marsupenaeus japonicus and Penaeus semisulcatus (Decapoda: Penaeidae)

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2004

The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of... more The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of two penaeid species were investigated in this study. In experiment 1, food intake (FI) of Marsupenaeus japonicus PLs (0.96 g), injected with NPY at 0.6 Ag per g BW, was investigated within 48 h posttreatment. In experiment 2, oral administration of NPY (at doses of 0, 0.125, 0.25, 0.5 Ag g À1 food) on feed intake and growth performance of Penaeus semisulcatus PLs (0.27 g) was examined for 6 weeks. In experiment 1, NPY injection significantly increased average daily FI of M. japonicus PLs within the first 24 h compared to the control (Pb0.05), but its stimulatory effect decreased on the second day (PN0.05). The increase in FI was 33% during the first 24 h and 17% during the next 24 h. In experiment 2, significant (Pb0.05) differences were found among the groups in terms of weight gain and food utilization (Pb0.05). Mean FI significantly increased (as much as 1.3-fold over the control) when NPY was orally administered at doses from 0.125 to 0.5 Ag g À1 feed. There was a positive relationship between FI and final weight (y=À0.972+2.098x, R 2 =0.81) and between FCE and NPY doses in the diets (y=45.37+3.46x, R 2 =0.91). The present findings indicated for the first time that NPY is a potent stimulator of food intake when administered either intramuscularly or orally to penaeid shrimps.

Research paper thumbnail of Influence of neuropeptide Y (NPY) on food intake and growth of penaeid shrimps Marsupenaeus japonicus and Penaeus semisulcatus (Decapoda: Penaeidae)

Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, 2004

The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of... more The effects of neuropeptide Y (NPY) administered intramuscularly or orally on postlarvae (PLs) of two penaeid species were investigated in this study. In experiment 1, food intake (FI) of Marsupenaeus japonicus PLs (0.96 g), injected with NPY at 0.6 microg per g BW, was investigated within 48 h posttreatment. In experiment 2, oral administration of NPY (at doses of 0, 0.125, 0.25, 0.5 microg g(-1) food) on feed intake and growth performance of Penaeus semisulcatus PLs (0.27 g) was examined for 6 weeks. In experiment 1, NPY injection significantly increased average daily FI of M. japonicus PLs within the first 24 h compared to the control (P<0.05), but its stimulatory effect decreased on the second day (P>0.05). The increase in FI was 33% during the first 24 h and 17% during the next 24 h. In experiment 2, significant (P<0.05) differences were found among the groups in terms of weight gain and food utilization (P<0.05). Mean FI significantly increased (as much as 1.3-fold...