Crocodilians are known to vocalize within the egg shortly before hatching [1,2]. Although a possible function of these calls - inducing hatching in siblings and stimulating the adult female to open the nest - has already been suggested, it has never been experimentally tested [1-5]. Here, we present the first experimental evidence that pre-hatching calls of Nile crocodile (Crocodylus niloticus)...

The spatial rhythm and periodic pattern of fish species was studied in lower upper streams Eniong River, Southeastern Nigeria for 12 consecutive months (April, 2019- March, 2020) using standard methods procedures. A total 178 individuals belonging to 14 families 25 were recorded the study. results revealed abundance favour stream with only two species: Clarias macromystax (Clariidae) Malapterur...

Background: Aquatic pollution by pesticidal application, in recent times, has gained much attention throughout the world, as they ultimately reach to the aquatic bodies through agricultural runoff or by aerial spraying and finally, impair the health status of fish. The aim of the present study was to evaluate the toxicological responses of Almix® herbicide on oxidative stress parameters in thre...

Antibiotics are essential for specific and diagnosed practices in aquaculture many of them toxic to fish if abused. This study reports the effects prolonged use dietary oxytetracycline at 0-10 times therapeutic dose (×: 80 mg/kg biomass/day) on kidney liver histoarchitecture Oreochromis niloticus. A dose-dependent reduction feed intake, survival biomass were noticed day 30 dosing. The major his...

The aim of this work was to confirm previous findings suggesting that the eyes are required for night-time melatonin production in Nile tilapia and further characterise this divergent circadian organisation. To do so, melatonin levels were firstly measured in eyecups and plasma to determine circadian patterns of melatonin production. Secondly, the effect of partial ophthalmectomy on the suppres...

Surface water contains a large number of pollutants, particularly human pathogens, organic toxicants and heavy metals. Due to the toxic nature of heavy metals towards marine organisms, its removal from the environment has been a growing issue. The biosorption of heavy metal ions from surface water using fish scales has emerged as an environmentally friendly technique. This study assessed the de...

Penelitian ini memiliki tujuan untuk menganalisis pengaruh ekstrak daun kelor (Moringa oliefera) terhadap infestasi Epitylis sp. pada ikan nila (Oreochromis niloticus). Unit percobaan adalah satu perlakuan yang diberikan dengan konsentrasi 62,5 ppm dan tanpa pemberian sebagai kontrol. Parameter pengamatan yaitu survival rate, penurunan jumlah nila, gerak nila. Pengumpulan data dilakukan menggun...

Key to predicting the response of fishes to climate change is quantifying how close fish are to their critical thermal limits in nature and their ability to adjust their thermal sensitivity to maintain performance. Here, we evaluated the effects of body size and habitat on aerobic scope (AS) and thermal tolerance of Nile perch Lates niloticus (L.), a fish of great economic and food security imp...

For this study, we performed a parasitological analysis of cage-cultured Nile tilapia (Oreochromis niloticus) from the Água Vermelha Reservoir, Southeastern Brazil, and verified relationships with limnological data, seasonality, and fish growth phase. From March 2010 to March 2011, sixty-three specimens of O. niloticus in three growth phases (i.e., initial, intermediate, and final) were collect...

The lungs of birds have long been known to move air in only one direction during both inspiration and expiration through most of the tubular gas-exchanging bronchi (parabronchi). Recently a similar pattern of airflow has been observed in American alligators, a sister taxon to birds. The pattern of flow appears to be due to the arrangement of the primary and secondary bronchi, which, via their b...