Marine AquacultureJodie Toft and the Marine NatCap team

InVEST Finfish Aquaculture Model Evaluate how human activities and climate change may

affect production and value of aquacultured finfish

Image courtesy of the BC Salmon Farmers Association

Terrestrial/freshwater model: Tier 1 supporting serviceTerrestrial/freshwater model: Tier 1 that quantifies service

Coastal Vulnerability

Coastal Protection

Overlap Analysis

Renewable Energy

Habitat Risk Assessment; Biodiversity

Reservoir Hydropower Production

Sediment Retention

Managed Timber

Production

Crop Pollination

Water Purification

Marine model: Tier 1 that quantifies serviceMarine model: Tier 0

Marine model: Tier 1 supporting service

InVE

ST M

odel

s & L

inka

ges

AestheticQuality

Recreation

Carbon Storage &

Sequestration

(Blue Carbon)

Agricultural Production

Flood Risk Mitigation

Groundwater Recharge

Fisheries (including

recreational)

AquacultureMarine Water

Quality

Optional model linkage, no sequencingRequired/optional model linkage, sequencing needed

Model coming soon!

Ecosystem Service = Provisioning of Food

What about filtration?

Terrestrial/freshwater model: Tier 1 supporting serviceTerrestrial/freshwater model: Tier 1 that quantifies service

Coastal Vulnerability

Coastal Protection

Overlap Analysis

Renewable Energy

Habitat Risk Assessment; Biodiversity

Reservoir Hydropower Production

Sediment Retention

Managed Timber

Production

Crop Pollination

Water Purification

Marine model: Tier 1 that quantifies serviceMarine model: Tier 0

Marine model: Tier 1 supporting service

InVE

ST M

odel

s & L

inka

ges

AestheticQuality

Recreation

Carbon Storage &

Sequestration

(Blue Carbon)

Agricultural Production

Flood Risk Mitigation

Groundwater Recharge

Fisheries (including

recreational)

AquacultureMarine Water

Quality

Optional model linkage, no sequencingRequired/optional model linkage, sequencing needed

Model coming soon!

VIDEO INTERLUDE.

Weight of fish harvested

Value of fish harvested

InputsFarm locations

Farm operationsNumber of fish, date of outplanting, ideal harvest and dressed wt.

Environmental characteristicsTemperature

EconomicsPrice-per-pound, operating costs, wages

Outputs

Growing an individual fish

Stigebrandt 1999. Turnover of energy and matter by fish – a general model with application to salmon. Fisken og Havet

0123456789

10

0 200 400 600

Wei

ght (

kg)

Days

T = 11CT = 9CT = 13C

Weightt = (aWt-1b * temperature effect) + Wt-1

Outplanting weight

Target harvest weight

Ecosystem service value: 1 growing cycle, 1 farm

Weight of harvested fish = (target harvest weight * # of fish in the net-pen) - mortality

Weight of processed fish = Wt. of harvested fish * fraction remaining after processing

Value of processed fish = Wt. of processed fish * (market price – fraction that is costs)

A complete model run: 1 farm

User-defined length of model run (e.g., 5 years)0 5

0

1

2

3

4

5

6

7

8

0 200 400 600

Wei

ght (

kg)

Days

Value of processed fish

0

1

2

3

4

5

6

7

8

0 200 400 600

Wei

ght (

kg)

Days

Fallowing period

The Model in Action:Salmon netpens in WCVI

Value of salmon harvest (5 years)

Finfish_HarvestValue ($)

0 - 3,397,750

3,397,751 - 6,795,500

6,795,501 - 10,193,250

10,193,251 - 13,591,000

• $240,325,000• 184,811,334 kg

Scenarios1. Baseline: some farms fallow, some don’t2. Scenario A: all farms have 4 month fallowing period, some

farms removed or relocated3. Scenario B: some farms fallow, some farms removed

Baseline

Scenario BScenario A

Baseline Scenario A Scenario B $-

$50,000,000

$100,000,000

$150,000,000

$200,000,000

$250,000,000

$300,000,000 Baseline Scenario A Scenario B

020,000,00040,000,00060,000,00080,000,000

100,000,000120,000,000140,000,000160,000,000180,000,000200,000,000

Harvested biomass (kg)

Net present value ($)

Data Requirements

Application

• What might you use this model for? • For what kinds of questions in what kinds of

decision making?

Hands-on session

The Model in Action: Part 2Shellfish aquaculture in Lemmens Inlet

Floathomes

Shellfish tenures

Value ($)2,209 - 44,640

44,641 - 87,072

87,073 - 129,503

129,504 - 171,935

Floathomes

Shellfish tenures

Value ($)2,209 - 44,640

44,641 - 87,072

87,073 - 129,503

129,504 - 171,935

Ecosystem risk<VALUE>

1.24 - 2.80

2.80 - 4.35

4.35 - 5.91

Float homes and shellfish tenures in Lemmens Inlet

A. Baseline B. Conservation

C. Industry Expansion

FloatHome

sEelgrassRecreationa

lKayaking

IncreasedKayaking

ShellfishAquacultur

e

GeoduckHarvest

CrabHarvest

Guerry et al IJBSESM, in press

What’s next for Aquaculture in InVEST?

Finfish: wastes and sea lice

Finfish: wastes and sea lice

For use by other InVEST models:• Habitat Risk

Assessment• Water Quality• Fisheries

Shellfish!

Who?• Pacific Oyster• Easter Oyster• Blue Mussel• Manila Clam

What?• Quantity, Value

of harvest• Quantity of

Filtration (for use in other models)

Questions?