[OANNES Foro] Spatio-temporal dynamics in the location of the fishing grounds and catch per unit effort for jack mackerel from Chinese trawl fleets on the Southeast Pacific Ocean

[Mario Cabrejos]

Journal of Applied Ichthyology

 <http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1439-0426/earlyview>
Early View (Online Version of Record published before inclusion in an issue)

Article first published online: 14 MAY 2015

DOI: 10.1111/jai.12765


 


 


Spatio-temporal dynamics in the location of the fishing grounds and catch
per unit effort (CPUE) for Chilean jack mackerel (Trachurus murphyiNichols,
1920) from Chinese trawl fleets on the high seas of the Southeast Pacific
Ocean, 2001–2010


1.     H. Zhang, S.-M. Zhang*, X.-S. Cui, S.-L. Yang, C.-J. Hua and H.-Y. Ma

Key Laboratory of East China Sea & Oceanic Fishery Resources Exploitation
and Utilization, Ministry of Agriculture, East China Sea Fisheries Research
Institute, Chinese Academy of Fishery Sciences, Shanghai, China. * Author's
address: Shengmao Zhang, E-mail:  <mailto:ryshengmao en 126.com>
ryshengmao en 126.com

2.      

 


Summary


The decadal spatio-temporal distribution of the fishing effort and catch per
unit effort (CPUE) for Chilean jack mackerel, Trachurus murphyi, stock are
poorly understood. Data from the Chinese jack mackerel fleet was used to
describe the location of the fishing effort and the relationship between
standardized CPUE and sea surface temperatures (SST) during the period
2001–2010. A significant change in the spatio-temporal distribution of
fishing effort and standardized CPUE was observed for jack mackerel during
the study period. From January to March, the average CPUE was generally <15
tonnes (t) per net, except for 2007–2009. CPUE increased significantly
during the autumn-winter (April to August), then gradually decreased in the
spring and early summer (September to December). Average standardized CPUE
in 2001–2005 was 23.3 t per net, but decreased to 19.7 t per net in
2006–2010. The change in the gravity center location of CPUE between months
was similar during the primary fishing period (autumn to winter) in
2001–2006. After 2006, the pattern began to differ in July–October, which
resulted in fishers spending more time to search for aggregations. A
seasonal change was observed in the range of SSTs associated with high CPUE.
Generally, the optimal SST range was from 13.0–15.0°C in autumn, 12.0–14.0°C
in winter, 13–16°C in spring, and 15–19°C before 2006. However, a 1–2°C
decrease in the optimal range in recent years was associated with a shift in
the fishing grounds location to the southern area. In 2009, the optimal SST
range was lower than in all other years. Taken together, the results suggest
that a more thorough understanding of the seasonal or decadal relationship
between SST and location of the fishing grounds is critical to improving the
efficiency of the fishery and its management.

 



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