An Appraisal of Growth and Instability of Marine Fish Production in Karnataka, India
An Appraisal of Growth and Instability of Marine Fish Production in Karnataka, India
Date
2016
Authors
Viswanatha, B.S
Senthiladeban, R
Infantina, J. A.
Rajakumar, M
Leo Cyril, A. R.
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India)Cochin
Abstract
This study attempts to understand the growth and
instability of marine fish production using secondary
fisheries related data of Karnataka for the period
1980-2010. Craft-wise decadal growth rate of marine
fish production was measured using Compound
Growth Rate (CGR) and instability was studied by
using Coppock Instability Index (CII) and Coefficient
of Variation (CV). The results showed high
instability in the number of purse seiners and
gillnetters and longliners during 1980-90 (D1) and
trawlers and rampanies during 1990-00 (D2). The
growth rate of purse seine boats and other
mechanised boats was more during 1980-90 (D1)
and for trawler and rampanies during 1990-00 (D2).
The maximum instability and growth rate for the
purse seiners’ harvest was seen during 1990-00 (D2)
and 1980-90 (D1) respectively. Similarly for trawlers,
peak harvests occurred during 2000-10 (D3) and for
other mechanized boats and rampanies it occurred
during 1980-90 (D1). The instability in terms of
CPUE for purse seiners was the highest during 1990-
00 (D2), whereas the overall growth rate in terms
of CPUE showed negative trend. Likewise, peak
instability and growth rate in terms of CPUE for
trawlers and other mechanised boats was observed
during 2000-10 (D3) and 1980-90 (D1) respectively.
The overall growth rate in terms of CPUE for
rampanies was negative, since their overall number
increased during the entire study period.
Description
Keywords
Catch per unit effort, Coppock Instability Index, coefficient of variation, compound growth rate
Citation
Fishery Tech 53(2):170-176