Practical Workshop on Stock Assessments of Indo Pacific King Mackerel and Narrow Barred Spanish Mackerel in the Southeast Asian Waters 16 20 July 2018 SEAFDECTD Thailand Presentation Outline ID: 934777
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Slide1
Intrinsic Rate of Seer Fish Population Growth (r)
Practical Workshop on Stock Assessments of Indo – Pacific King Mackerel and Narrow Barred Spanish Mackerel in the Southeast Asian Waters
16 – 20 July 2018
SEAFDEC/TD, Thailand
Slide2Presentation Outline
What is “r”
Method
r for
S
eer
F
ishes
S
pecies
Fishing Ground
Narrow – Barred Spanish Mackerel
Indo – Pacific King Mackerel
Summary and
discussion
Slide3What is “r”
Intrinsic rate of population growth or intrinsic rate of increasing (r)
The proportion represented to average growth rate of entire population which was used to measured the potential for growth rate in the population
This is the fundamental metric in the ecology and evolution of immediate practical application in wild life conservation and management (Cortés, 2016)
Based on species life history concept or r and K species
Characteristics
r – species
K – species
Maturity
Early
age and s
mall
size matured
Late age and
l
arge size matured
Off springs
Large number without parental
care
Small number with parental care
Life
spam
Short life spam
Long life spam
Slide4What is “r”
This parameter is used in several ecological study to monitoring the changing of population size
For ecological study, r was commonly estimated demographic parameters used for assessment of extinction risk as well (Pardo
e
t al., 2016)
Useful for the endangered species study, population management and fishery resource population (sharks, tunas and other important economical species)
Slide5Method
Relation between r, carrying capacity (K) and MSY for ASPIC
When r = Intrinsic rate of increasing
MSY = Maximum Sustainable Yield
And K = Carrying capacity
Slide6“r” for
S
eer
F
ishes
Species
FAO: Technical paper (definition and concept of r)
IOTC: Scientific report and papers
Fishbase
: In species page, the last topic named “Estimates of some properties based on models”
Others
Slide7Fishing Ground
Slide8Narrow – Barred Spanish Mackerel
Scomberomorus
commerson
(Lacepède, 1800)Pelagic, long shore migratory species
Small school, feed on small pelagic fishes, squids and
P
eneoid
shrimps
Lm 85 cm.
L max 240 cm. FL,
normally 120 cm.IUCN status: Near Threatened
Slide9Narrow – Barred Spanish Mackerel
Scomberomorus
commerson
(Lacepède, 1800)
Slide10Narrow – Barred Spanish Mackerel
Scomberomorus
commerson
(Lacepède, 1800)
r
Area
References
0.54 (0.27 – 1.09)
Worldwide
Fishbase
0.31Western AustraliaMackie (2013)
0.6 – 1.5
Indian Ocean
IOTC (2015)
1.0 – 1.5
Indian Ocean
IOTC (2016)
Slide11Indo – Pacific King Mackerel
Scomberomorus
guttatus
(Bloch & Schneider, 1801)Pelagic, migratory species along shore line, sometimes
enter estuarine
Small school,
feed on small pelagic fishes, squids and
crustaceans
Lm 40 cm.
L max 76 cm FL., normally 55 cm.
IUCN status: Data Deficient
Slide12Indo – Pacific King Mackerel
Scomberomorus
guttatus
(Bloch & Schneider, 1801)
Slide13Indo – Pacific King Mackerel
Scomberomorus
guttatus
(Bloch & Schneider, 1801)
r
Area
References
1.0 – 1.5
Indian Ocean
IOTC (2016)
Slide14Summary and Discussion
Intrinsic rate of population growth or intrinsic rate of increasing (r)
U
seful for monitoring the changing in population size of many fishery resources
Important seeding value for ASPIC
To review r value, many reference sources provide r value including FAO, IOTC and fishbase
Slide15Summary and Discussion
For calculation, r
should be calculated specifically for each stock by species
For literature review, the references for r should be selected carefully considering to fishing ground/distribution area
The most update information from appropriate FG or area should be considered to avoid any uncertainties
Slide16THANK YOU
SO MUCH
FOR YOUR KIND ATTENTION!!!
Slide17Cortes, E., 2016, Perspective on the intrinsic rate of population increasing, Methods in Ecology and Evolution, vol. 7(10).
Pardo, S.A., H.K.
Kindsvater
, J.D.
Raynolds
and N.K. Dulvy, 2016, Maximum intrinsic rate of population increase in sharks, rays and chimeras: the importance o
f survival to maturity, Canadian Journal of Fisheries and Aquatic Sciences, vol. 73(8), pp. 1159 – 1163.