[Population resources and fishery management policies of Schizopygopsis younghusbandi in the Yarlung Zangbo River, China.].

Schizopygopsis younghusbandi, an endemic species in China, is threatened by overfi-shing and biological invasion. With 694 individuals collected during August 2008 to August 2009 from the Xietongmen to Nimu of Yarlung Zangbo River, Tibet, the population resources and fishery management policies of the fish were studied using per-recruit models. The total instantaneous annual mortality (Z) of S.

[Bioaccumulation and Biomagnification of Heavy Metals in Three Gorges Reservoir and Effect of Biological Factors].

Three Gorges Reservoir (TGR) reached the maximum water level (175 m) of impoundment in Oct. 2010. In order to reveal the potential influence of the greatest water-level impoundment on the heavy metal pollution in the typical waters of TGR, the content level of trace metals ( Hg, Cd and Pb) in biota and potential biomagnification along the aquatic food chain were investigated in the main stem of TGR from July 2011 to August 2012, as well as the relationship between the trace metal concentrations of aquatic consumers (fish and aquatic invertebrate) and biological factors.

Stock assessment and management implications of an endemic fish, , in the Yarlung Zangbo River in Tibet, China.

Background: is an endemic species only inhabiting the middle and upper reaches of the Yarlung Zangbo River and its tributaries at altitudes above 3600 m in the Qinghai-Tibet Plateau and has suffered a continuous decline of population size owing to anthropogenic disturbance. However, little is known about the stock status of this species and how to protect it. In this study, we evaluated the population status of and investigated two management policies including the minimum age limits and seasonal closure in the Yarlung Zangbo River.

[Effect of feed residues on the release of nitrogen and phosphorus of pond sediment].

The effect of feed residues on release law of nitrogen and phosphorus in water-sediment interface was studied under the simulated condition in laboratory. Two sets of conditions were applied in this study, static condition (A group) and feed add condition (B group). The results show that DO in A group is higher than that in B group (P < 0.

The complete mitogenome sequence of Ptychobarbus dipogon (Cypriniformes: Cyprinidae).

The complete mitochondrial genome of Ptychobarbus dipogon is 16,787 bp in length, consisting of 13 protein-coding genes, 22 transfer RNA genes, 2 ribosomal RNA genes and 2 non-coding regions: control region (CR) and origin of light-strand replication (OL). The gene order of P. dipogon mitogenome is similar to those observed in most other vertebrates.

Effects of non-steroidal aromatase inhibitor letrozole on sex inversion and spermatogenesis in yellow catfish Pelteobagrus fulvidraco.

The effects of letrozole (LZ), a potent nonsteroidal aromatase inhibitor (AI), on growth performance, sex inversion, and sex changes were investigated in yellow catfish (Pelteobagrus fulvidraco), which display sexual dimorphic growth. Growth performance was promoted significantly in the low-dose LZ treatment, compared with the control. Four LZ treatments produced dose-dependent male proportions that were significantly higher than that of the control.

Blood cells of a sisorid catfish Glyptosternum maculatum (Siluriformes: Sisoridae), in Tibetan Plateau.

The peripheral blood cells of a sisorid catfish Glyptosternum maculatum were studied using light microscope and transmission electron microscope. The size of cells and nucleus, and the percentage of different leucocytes were also described. Erythrocytes and four types of leucocytes: lymphocytes, heterophils, monocytes, and thrombocytes were characterized in G.