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Fishing Ground Science Lab
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A lab that explores why fishery resources rise and fall by studying how fish survive their earliest life stages.
AboutAbout the lab
The number of survivors determines the size of the stock
The Fishing Ground Science Lab studies what causes the abundance of fishery resources to change, focusing on fish that live near the seafloor, such as flatfishes and cods.
The size of a fish stock depends on how many individuals survive the egg, larval, and juvenile stages.
The lab therefore measures the density of eggs, larvae, and juveniles, water temperature, food availability, and growth rate, working to identify the causes of stock fluctuations and to predict them.
It combines field surveys with rearing experiments, and it is a lab with many shipboard surveys and outdoor activities.
Key terms
- Larvae and juveniles
- A collective term for 'larvae', which have just hatched from the egg, and 'juveniles', which have a full set of fins and a form close to that of adults
- Plankton net
- A tool that collects plankton and fish eggs and larvae by towing a fine-mesh net through the water
- Otolith
- A small stone in a fish's head. Ring-like layers form daily, like tree rings, revealing the fish's birth date and growth rate
ResearchResearch themes
The lab aims to identify and predict the causes of rises and falls in fishery resources by studying the ecology of eggs, larvae, and juveniles, the stages that determine stock size. It studies demersal fish and squid around Mutsu Bay and the Tsugaru Strait through both field surveys and rearing experiments.
*Illustrative imageLarvae and juveniles of demersal fish and stock fluctuations
The lab measures the density of eggs, larvae, and juveniles of fish that live near the seafloor, such as flatfishes, cods, fat greenling, Okhotsk Atka mackerel, and sailfin sandfish, along with water temperature, food availability, growth rate, and how they are transported by currents, in order to tackle the causes of stock fluctuations and their prediction. It also evaluates the environment of fishing grounds from the habitats of young fish and parent fish.
*Illustrative imageSurvival of sand lance in Mutsu Bay
In Mutsu Bay, Aomori Prefecture, the lab collected sand lance (genus Ammodytes) larvae and their plankton prey with plankton nets from the training vessel Ushio Maru and from fishing boats, and also measured water temperature and salinity. From the relationship between larval growth, feeding condition, and the environment, it investigates the causes of stock fluctuations.
*Illustrative imageOkhotsk Atka mackerel larvae that are more likely to survive
For Okhotsk Atka mackerel around the Tsugaru Strait, the lab uses field surveys and rearing experiments to investigate when, in what environment, and from what kind of parents the larvae that survive more easily are born. It also examines stomach contents and otolith rings to explore the relationship between food, growth, and survival.
*Illustrative imageNutrient sources of Japanese flying squid paralarvae
It is still unknown what newly hatched Japanese flying squid paralarvae grow on. The lab rears paralarvae hatched from naturally spawned eggs in tanks and conducts experiments to identify the nutrient sources they need for growth.
MembersFaculty
- ProfessorTetsuya Takatsu
- Associate ProfessorMitsuhiro Nakaya
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Flounder Larva, Woods Hole, MA, USA” Taeylenol / CC BY 4.0 (cropped)
- Larvae and juveniles of demersal fish and stock fluctuations: “Pseudopleuronectes yokohamae Kaikyokan” Totti / CC BY-SA 4.0 (cropped)
- Survival of sand lance in Mutsu Bay: “Ammodytes hexapterus” Mandy Lindeberg, NOAA/NMFS/AKFSC / Public domain (cropped)
- Okhotsk Atka mackerel larvae that are more likely to survive: “Pleurogrammus azonus otaru” YockeyT / CC BY-SA 4.0 (cropped)
- Nutrient sources of Japanese flying squid paralarvae: “Todarodes pacificus Hoyle” A. Pollock / Public domain (cropped)
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