The effects of increased temperature and CO2 on the Amazon fish, tambaqui (Collosoma macropomum, Cuvier, 1818)

Abstract

The effects of temperature and carbon dioxide (CO 2 ) changes on different haematological parameters and enzymes activities such as on LDH (Lactate de Hydrogenase), MDH (Malate de Hydrogenase) & GST (Glutathione-STransferase) were studied in the liver and skeletal muscles of Tambaqui fish (Collosoma macropomum, Cuvier, 1818) in the Laboratory of Ecophysiology and Molecular Evolution (LEEM) of the National Institute for Amazonian Research (INPA). The experimental procedures involved the exposure of fish to temperature rise from 28Cº to 32Cº and an increased in CO 2 concentration up to 10 times higher than the current levels for 24, 48, 72 and 96 hours. The levels of LDH, GST and MDH in both the tissues of Tambaqui (Muscles & Liver) showed a significant decreased at different along the different exposure periods. The levels of plasma glucose in blood decreased and the values of Hb, Ht, RBC, VCM, and HCM & CHCM showed increased after the exposure.

Gonadal morphology, histology and spermatogenesis of striped piggy fish, Pomadasys stridens (Forsskal, 1775) (Family: Pomadasyidae) from Karachi coast, Pakistan.

“…It determines the relationship between these morphological differences and the conditions of the reproductive structures from the histological examinations of the gonads of both the sexes. However, an innovative approach may enable the detection of a mechanism for common regulation to all biota components, with benefits for the scientific knowledge, for the productive chain and especially for people in the region [22] . In the current study are reporting some findings on gonadal morpho-histology and spermatogenesis and relationship with some other reproductive biology of this species.…”