The effects of oestrogenic exposure upon exposure indicators and reproductive success in a marine fish were investigated using a series of short and long-term exposures of the sand goby (Pomatoschistus minutus) to oestrogenic materials. A 140 bp cDNA probe for sand goby vitellogenin (VTG) was used to measure hepatic VTG mRNA expression. Effects on other novel and “classical” biomarkers of oestr...

In the present research, modification of the zona radiata (ZR) around the molly (Poecilia sphenops, Valencinnes 1846) and bighead carp (Hypophthalmichthys nobilis, Richardson 1845) oocytes and in the zygotes were studied for pre- and post-fertilization stages and its relationship with the reproductive strategy. Light and scanning electron microscopic studies on the histological sections of...

Cause-and-effect interpretations of the apparent impacts of biological invasions are confounded by the coincident occurrence of non-native species and changes to abiotic factors. Native community structure and function can vary greatly in space and time, owing to abiotic variables that could potentially be affected by non-native species. Here, we sought to determine the relative importance of a...

The Ponto-Caspian round goby (Neogobius melanostomus) was introduced to the Gulf of Gdańsk, southern Baltic Sea, in the late 1980s, and it has now become the dominant demersal fish species in shallow water. This study aimed to assess diet preferences and the degree of diet overlap between the round goby and the native flounder (Platichthys flesus). Results from time-series of stomach contents a...

estimation of fillet biochemical composition and processing yield is primary needs for fish processing. present study was aimed to investigate for determining fillet biochemical composition and processing yield of bighead (hypophthalmichthys nobilis) for nutritional labeling and economical estimation of its products by regression equations. for this purpose 55 specimen of bighead were applied i...

schismatogobius deraniyagalai is recorded from the seethanathi river of karnataka state in the southern part of india. previous records of these species were from the streams in kerala of india and from freshwater habitats of sri lanka. herein we report the occurrence of this species in seethanathi river showing its distribution extended further north along the west coast of peninsular india.

An invasive benthivorous fish, the Eurasian round goby (Neogobius melanostomus) is abundant throughout the lower Great Lakes – St. Lawrence River system. We examined the round goby’s potential to alter benthic communities on cobble substrates in the upper St. Lawrence River. During the summers of 2008 and 2009, macroinvertebrates and benthic algae were sampled across sites with varying goby den...

In the present study, the cestoid Pterobothrium crassicolle Diesing, 1850 (Trypanorhyncha), was observed parasitizing specimens of the violet goby (Gobioides broussonnetii Lacepède, 1800) collected from the estuary of the Paracauarí River on Marajó Island in the north of the Brazilian state of Pará, between January 2009 and December 2010. Tissue samples were analyzed, which led to identificatio...

Abstract Migration barriers being selective for invasive species could protect pristine upstream areas. We designed and tested a prototype protective barrier in vertical slot fish pass. Based on the individuals’ swimming responses to flow field, we assumed this would block ascension of round goby, but allow comparable native (gudgeon bullhead) ascend. The was three steps: description, quantific...