Research

Counting what we can't easily see.

Sharks, scallops and deep-sea isopods are hard to survey: they're rare, cryptic, or live where people can't go. I build tools that let cameras, drones and a liter of seawater do the counting, then correct the machine's mistakes statistically so the numbers hold up in a stock assessment.

01 2026 – · NOAA NEFSC

Automated optical surveys for stock assessment

object detection · bias correction · GCP

Detection, tracking and measurement models for HabCam seafloor imagery: sea scallops, Jonah crabs, roundfish and elasmobranchs. Statistical bias-correction turns imperfect model counts into abundance estimates that feed spatial GAMs and stock assessments, all running on a Google Cloud pipeline I designed and administer.

  • Lead-author manuscript on automated scallop counting and bias-correction (in review, Ecological Informatics)
  • Edge-AI workflows deployed at sea during offshore HabCam cruises
  • Presented at the NMFS Optical Strategic Initiative Workshop, Newport OR (2026)
HabCam seafloor frame of a dense sea scallop bed with every scallop outlined by an automated detection box
Automated detections across a dense sea scallop bed · HabCam imagery: NOAA NEFSC
HabCam frame of gravel seafloor with a single sea scallop outlined by a detection box, a small sea star on its shell and a fish alongside
A single detected scallop on gravel, ignoring the sea star and fish beside it · HabCam imagery: NOAA NEFSC

Related papers

  1. 2026 In review

    Automatically counting and measuring Atlantic sea scallops (Placopecten magellanicus) from underwater imagery with object detection and bias-correction

    Jenrette, J. F., Hart, D. R., Chang, J.-H., Fairclough, C., McManus, M. C.

    Ecological Informatics

02 2020 – 2025 · Virginia Tech · National Geographic · Ocean Exploration Trust · Oxford

The Shark Detector

image classification · video AI · R / Flask API

A modular deep-learning package that detects sharks in images and video and classifies them across hundreds of species to the genus level. I wrapped it in an R package and Flask API so ecologists can run it without writing Python, and extended it to aerial drone and baited-video surveys.

  • Partnered with National Geographic, Ocean Exploration Trust and Oxford to automate shark classification from expedition video
  • Drone object-detection and tracking pipelines for counting sharks from the air (Beneath The Waves)
  • Contributor to SharkTrack, an open-source tool for shark and ray video analysis
Aerial drone frame of shallow turquoise water with dozens of tracked shark detections, each labeled with an ID
Photo: Beneath The Waves

Related papers

  1. 2022

    Shark detection and classification with machine learning

    Jenrette, J. F., Liu, Z. Y. C., Chimote, P., Hastie, T., Fox, E. , et al.

    Ecological Informatics

  2. 2026 In review

    Accelerating shark video surveys with AI and automated workflows

    Jenrette, J. F., Agustines, A., Spencer, E. T., Schallert, R., Varini, F. , et al.

    Ecological Informatics

  3. 2026

    Shark object-detection and tracking: a data sourcing and training study

    Varini, F., Jenrette, J. F., Wilday, S., Gayford, J., Ferretti, F. , et al.

    Ecological Informatics

  4. 2024

    SharkTrack: an accurate, generalizable software for streamlining shark and ray underwater video analysis

    Varini, F., Gayford, J. H., Jenrette, J. F., Witt, M., Garzon, F. , et al.

    arXiv preprint arXiv:2407.20623

03 2021 – 2025 · The SeaKeepers Society · Virginia Tech

Finding Mediterranean white sharks with eDNA

eDNA · particle tracking · citizen science

Species-specific eDNA assays and particle-dispersal hindcasts to detect critically endangered white sharks in the Sicilian Channel and beyond. With The SeaKeepers Society, I distributed sampling kits to sailors and yacht crews to extend coverage across space, time and depth.

  • White sharks detected at four stations in the Sicilian Channel from 170 samples (2021 – 2023)
  • Led expeditions and trained citizen-science sailors across the Mediterranean
  • Teach shark eDNA and population genetics to master's students in Sousse, Tunisia
Jeremy filtering seawater samples for environmental DNA on the deck of a boat

Related papers

  1. 2023

    Detecting white sharks in the Mediterranean with environmental DNA

    Jenrette, J. F., Jenrette, J. L., Truelove, N. K., Moro, S., Dunn, N. I. , et al.

    Oceanography

  2. 2024

    On the tracks of white sharks in the Mediterranean Sea

    Ferretti, F., Shea, B., Chapple, T., … Jenrette, J. F. , et al.

    Frontiers in Marine Science

  3. 2024

    First satellite track of a juvenile shortfin mako shark (Isurus oxyrinchus) in the Mediterranean Sea

    Shea, B., Chapple, T. K., Echwikhi, K., Gambardella, C., Jenrette, J. F. , et al.

    Frontiers in Marine Science

  4. 2025

    Trophic niche partitioning between the white shark (Carcharodon carcharias) and the shortfin mako (Isurus oxyrinchus) in the Mediterranean Sea

    Gambardella, C., Fernández-Corredor, E., Echwikhi, K., Jenrette, J. F., Lemsi, C. , et al.

    Wildlife Research

04 2024 – 2026 · Beneath The Waves · SOKENDAI

Giant deep-sea isopods

genomics · deep-sea video · open biodiversity data

An integrated observational and molecular framework for the giant isopod genus Bathynomus: crowdsourced records to resolve distribution and taxonomy, plus de novo genome and RNA sequencing to study how these animals survive crushing depth, cold and scarce food.

  • Field work in Suruga Bay, Japan, deploying deep-sea video and sampling
  • Co-supervising a University of Amsterdam master's student on deep-sea video and eDNA workflows
Jeremy and a colleague dissecting a giant isopod at a lab bench
Photo: Beneath The Waves

Related papers

  1. 2026

    Addressing distributional and taxonomic uncertainty in the deep-sea giant isopod genus Bathynomus with an integrated observational and molecular framework

    Jenrette, J. F., Riehl, T., Izioka, A. K., Motoki, S., Aldridge, S. E. , et al.

    Deep Sea Research Part I: Oceanographic Research Papers

05 2019 – 2025 · Virginia Tech · SeaQL Lab

sharkPulse

NLP · data engineering · Shiny

A global cyberinfrastructure that mines social media and citizen-science platforms for shark and ray sightings, validates them with AI, and structures them for population analyses. I administered the servers and databases and built the classifiers that keep the pipeline running.

  • Turns opportunistic photos into usable occurrence data for data-deficient species
  • PostgreSQL + Linux infrastructure, Shiny dashboards, automated image validation
Split-level photo of a whale shark feeding beside a fishing boat, from the sharkPulse record archive
Photo: sharkPulse record archive

Related papers

  1. 2025

    From data deficient to big data in shark conservation

    Ferretti, F., Jenrette, J. F., Moro, S., Butner, C., Fox, E. , et al.

    Fish and Fisheries

In the field

Where the data comes from.