Juniper Publishers-Oceanography Open Access Journal

  Oceanography & Fisheries Open Access Journal Abstract Upper ocean thermodynamic and biological responses between the two super cyclones namely Gonu (1-7 June 2007) and Kyarr (24 Oct – 02 Nov 2019) were investigated using multi-satellite datasets, and hycom model data. During Gonu, one strong cooling patch (>5.5°C) observed but in the case of Kyarr it is 3.8°C was observed along its track. The locations of these cold patches are highly correlated with the relative depth of the 26°C isotherm and mixed layer depth (MLD) and upper ocean heat content (UOHC). The enhancement of surface chlorophyll a (chl-a) concentration was detected in these cold regions as well, mainly due to the TC-induced mixing and upwelling. Moreover, the existing ocean cyclonic eddy has been found to significantly modulate the magnitude of surface cooling and chl-a increase during the Kyarr period. The possible causes of intensity change of cyclones were also explored with UOHC. Upper ocea...

  Abstract Availability of nutritionally balanced commercial feeds is essential in producing healthy, high-quality aquatic animals. Protein is the most important component of aquaculture feeds. Fish require not only a minimum level of protein but also that the essential amino acids are balanced to meet the requirements of each single one. Histidine is an essential amino acid with several functions including protein synthesis, tissue formation and repair as well as maintenance of osmoregulation and myelin sheaths. It also regulates the immune system and acts as antioxidant in fish. Histidine deficiency depresses growth performance and feed utilization. If in excess, it causes disruption of the balance of dietary amino acids leading to toxicity or extensive necrosis in the epithelial cells. Furthermore, histidine serves as an important antioxidant and buffer in various organs of several fish species. In aquaculture, extensive research has been carried out to optimiz...

Abstract The anadromous Tenualosa ilish is the most economically important fish in the world and consequently in Iran. The national fish of Iranian contributes about 12% of the total fish production and about 1% of GDP. About 4,500,000 people are directly involved with the catching for livelihood; around four to five million people are indirectly involved with the trade. The present study aimed to estimate 96hLC 50s of silver and selenium on LC 50 of nanoparticle of silver and selenium in different life stages of the fish T. ilish in the environment experimental. The LC 50 for silver in four stages of fish T. ilish were larvae (0.23ppm), fry (0.45ppm), juvenile (0.90ppm) and fingerling (1.45ppm), respectively. There was significance difference between LC 50 levels in four stages of fish species (P<0.05>) and the LC 50 for selenium in four stages of fish T. ilish were larvae (0.89ppm), fry (0.95ppm), juvenile (1.12ppm) and fingerling (1.65ppm), respectively. ...