A systematic checklist of fish and shellfishes the Poonthura estuary, Kerala, India is provided including notes on their conservation status. This includes 66 finfish five shellfish, belonging to 17 orders, 35 families, 60 genera. Carangiformes richest order (11 species, eight genera, three families), representing 15.4% total diversity. Carangidae, most diverse family with nine representatives,...

The Pacific tarpon Megalops cyprinoides is a euryhaline fish that is widely distributed in offshore waters of the tropical and subtropical Indo-Pacific Ocean. It spawns in offshore waters and the larvae drift with tidal currents before recruiting to estuarine nursery areas at ~25 to 30 d posthatching. Young Pacific tarpon are found in coastal waters, rivers, estuaries, inner bays, and mangrove ...

Fourteen species (twelve adult and two larval) of nematodes belonging to the Ascaridoidea, Camallanoidea, Cosmocercoidea, Habronematoidea, Oxyuroidea, Seuratoidea and Trichinelloidea were collected from fishes in the Sudan (River Nile and Atbara Dam Lake), whereas only four species (one adult and three larval) of the Ascaridoidea, Camallanoidea, Dioctophymatoidea and Trichinelloideafrom fishes ...

Experiments were conducted to understand the effects of thyroid hormones and thiourea (TU) on otolith growth during metamorphosis of leptocephali. TU is an anti-thyroid hormone drug that inhibits the production of thyroxine (T4) and triiodothyronine (T3) in the thyroid tissue. Fully grown leptocephali of tarpon Megalops cyprinoides collected at the mouth of the Gong-Shy-Tyan Brook, N Taiwan, we...

1. The influence of different water temperatures on the electric organ discharge (EOD) of a mormyrid fish Marcusenius cyprinoïdes was studied. The range of the water temperatures was fixed according to the seasonal temperature variations of the rivers in Central Africa, the natural habitat of this species. 2. The EOD activity was characterized using the following parameters: mean EOD rate, EOD ...

We examined the effects of water temperature, salinity and feeding regime on leptocephalus metamorphosis, and on daily growth increment deposition and strontium:calcium (Sr:Ca) ratios of otoliths in the Pacific tarpon Megalops cyprinoides. The tarpons at the pre-metamorphic leptocephalus stage (SI) were collected in the estuary, marked with tetracycline and then reared for 18 and 30 d in 2 inde...

Several times throughout their radiation fish have evolved either lungs or swim bladders as gas-holding structures. Lungs and swim bladders have different ontogenetic origins and can be used either for buoyancy or as an accessory respiratory organ. Therefore, the presence of air-filled bladders or lungs in different groups of fishes is an example of convergent evolution. We propose that air bre...