Related Experiment Video
Updated: Dec 10, 2025

Silencing the Spark: CRISPR/Cas9 Genome Editing in Weakly Electric Fish
Published on: October 27, 2019
Annual breeding in a captive smalltooth sawfish, Pristis pectinata
Kathryn I Flowers1, Demian D Chapman1, Todd Kemp2
1Institute of Environment, Department of Biological Sciences, Florida International University, North Miami, Florida, USA.
Abstract:
The critically endangered smalltooth sawfish Pristis pectinata reproduces biennially in central west Florida, U.S.A. Here we demonstrate that smalltooth sawfish are physiologically capable of reproducing annually in a captive environment. The smalltooth sawfish are held in an open system, with abiotic conditions that vary naturally with the surrounding environment in The Bahamas. This suggests wild smalltooth sawfish may also be capable of annual reproduction provided there are adequate prey resources, limited competition and mate availability.
Related Concept Videos
Fixed Action Patterns
Testing a Claim about Population Proportion
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
Conservation of Small Populations

