Related Experiment Video
Updated: Jul 2, 2026
06:49
Sperm Collection and Computer-Assisted Sperm Analysis in the Teleost Model Japanese Medaka (Oryzias latipes)
Published on: October 6, 2022
Treated wastewater effluent reduces sperm motility along an osmolality gradient
H L Schoenfuss1, J T Levitt, R Rai
1Aquatic Toxicology Laboratory, St Cloud State University, St Cloud, MN 56301, USA. hschoenfuss@stcloudstate.edu
Archives of Environmental Contamination and Toxicology
|September 5, 2008
Summary
Treated wastewater effluent negatively impacts fish sperm motility in a dose-dependent manner. River water also showed variable effects on sperm activation, highlighting challenges in assessing effluent impacts.
Area of Science:
- Environmental Toxicology
- Reproductive Biology
- Aquatic Ecotoxicology
Background:
- Treated wastewater effluent (TWE) poses risks to aquatic organisms.
- Physicochemical differences between TWE and receiving waters can affect organismal function.
- Teleost sperm activation is sensitive to environmental osmolality changes.
Purpose of the Study:
- To investigate the impact of TWE osmolality on goldfish sperm motility.
- To test the hypothesis that higher TWE osmolality adversely affects sperm activation concentration-dependently.
Main Methods:
- Goldfish milt was exposed to varying concentrations of TWE (10%, 50%, 100%), deionized water, river water, and a synthetic ion mixture.
- Sperm motility and velocity were analyzed using a computer-assisted sperm analyzer over 1 minute.
- Osmolality differences between treatments were measured.
Main Results:
- Sperm motility declined concentration-dependently with increasing TWE levels.
- Deionized water induced maximal sperm activation.
- River water and a synthetic ion mixture showed low sperm activation, with river water results varying by collection day.
Conclusions:
- TWE adversely affects sperm motility in a concentration-dependent manner.
- Assessing TWE impacts is complex due to variable environmental factors and reference site conditions.
- Osmolality is a key factor influencing sperm activation in TWE.
Related Concept Videos
01:15Sperm Transport
The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
The maturation phase occurs in the epididymis, where sperm...
The maturation phase occurs in the epididymis, where sperm...
01:30Biological Treatment of Effluent and Waste Water
Biological wastewater treatment relies on the metabolic activity of microorganisms to remove pollutants from sewage. In modern treatment systems, this process is organized into sequential stages that progressively reduce solid material, dissolved organic matter, and microbial contamination. Each stage plays a distinct role in improving water quality and preparing the effluent for safe discharge or reuse.Primary and Secondary TreatmentPrimary treatment is a physical process that removes large...
01:30Osmosis
Osmosis is the movement of free water molecules through a semipermeable membrane. The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of free water...
Water, like other substances, moves from a high concentration of free water...
00:47Osmosis
Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.Diffusion Versus OsmosisBoth diffusion and osmosis are types of passive transport—cellular transport that does not require...