Dispersal of the larval stage of southern bluefin tuna, Thunnus maccoyii, in the east Indian Ocean

1994 ◽  
pp. 137-148
Author(s):  
T. L. O. Davis ◽  
V. D. Lyne
Keyword(s):  
Indian Ocean ◽  
Larval Stage ◽  
Bluefin Tuna ◽  
East Indian ◽  
Southern Bluefin Tuna ◽  
East Indian Ocean

Density Dependence of Larval Growth of a Marine Fish, the Southern Bluefin Tuna, Thunnus maccoyii

1991 ◽  
Vol 48 (8) ◽  
pp. 1358-1363 ◽  
Author(s):  
Greg P. Jenkins ◽  
Jock W. Young ◽  
Tim L. O. Davis
Keyword(s):  
Growth Rate ◽  
Marine Fish ◽  
Food Limitation ◽  
Larval Growth ◽  
Bluefin Tuna ◽  
Density Dependent ◽  
East Indian ◽  
Southern Bluefin Tuna ◽  
Slow Growing ◽  
East Indian Ocean

Competition for food among larvae and subsequent reduction in growth rates has been proposed as a mechanism to explain the apparent density-dependent control of some exploited marine fish populations, but has received little support from field data. Growth of larvae of southern bluefin tuna, Thunnus maccoyii, in the East Indian Ocean was significantly different among stations sampled randomly within a 20-km radius. Growth rate was positively correlated with feeding rate but not with temperature, indicating that larvae were food limited to a varying degree. A negative correlation between growth rate and abundance suggested that food limitation was density dependent. Regression analysis indicated that in areas of highest larval densities there was an approximate 25% reduction in growth rate. We suggest that in areas of high abundance, larvae were competing for food, leading to a density-dependent reduction of growth rate. Because the larval stage of high mortality is prolonged, cumulative mortality of slow-growing larvae over this period may be greater, even if the mortality rate is constant.

Seasonal variations in the Indian Ocean along 110°E. I. Hydrological structure of the upper 500 m

1969 ◽  
Vol 20 (1) ◽  
pp. 1 ◽  
Author(s):  
DJ Rochford
Keyword(s):  
Indian Ocean ◽  
Surface Waters ◽  
Water Masses ◽  
Surface Currents ◽  
Temperature Changes ◽  
East Indian ◽  
Hydrological Structure ◽  
The Indian Ocean ◽  
The Tropics ◽  
East Indian Ocean

Tropical and subtropical water masses at surface and subsurface depths were separated by their salinity, temperature, oxygen, and nutrient characteristics. The annual mean depths and latitudinal extent of these water masses were determined. Annual changes in the upper 50 m were generally so small relative to those found in other oceans that advection and mixing must have been less important in their genesis than local climatic changes. There was a barely significant seasonal rhythm in surface phosphate and nitrate, with peak occurrences of each some 6 months apart. At each latitude the permanent thermal discontinuity centred around a particular isotherm varied little in intensity during the year, but rose and fell in accordance with surface currents. The thermocline south of c. 18�S. varied little in depth but greatly in intensity during the summer. The depth of the mixed layer was much less in summer and at all times shallower in the tropics. The depth of this layer was governed more by the accumulation of surface waters by zonal currents and eddies, than by wind stress or convective overturn. Therefore there was little difference from south to north, or month to month, in average nutrient values of this mixed column. The movement of the various surface waters, deduced from salinity and temperature changes during the year, usually agrees with geostrophic currents across 110�E, and ships' observations of surface currents in the south-east Indian Ocean.

Spatial variation of CDOM and its influencing factors in tropical East Indian Ocean during summer

2018 ◽  
Author(s):  
Xiaoqing Cai ◽  
Xiaoyong Wang ◽  
Jie Meng ◽  
Dayong Bi ◽  
Qingwei Zhou
Keyword(s):  
Indian Ocean ◽  
Spatial Variation ◽  
Influencing Factors ◽  
East Indian ◽  
East Indian Ocean

scholarly journals Distribution of 228Ra in surface sea water of the East Indian Ocean.

1979 ◽  
Vol 13 (5) ◽  
pp. 201-206 ◽  
Author(s):  
Takashi Okubo ◽  
Kazunori Furuyama ◽  
Masanobu Sakanoue
Keyword(s):  
Indian Ocean ◽  
Sea Water ◽  
East Indian ◽  
East Indian Ocean

A possible relationship between East Indian Ocean SST and tropical cyclone affecting Korea

2014 ◽  
Vol 76 (1) ◽  
pp. 283-301 ◽  
Author(s):  
Ki-Seon Choi ◽  
Sangwook Park ◽  
Ki-Ho Chang ◽  
Jong-Ho Lee
Keyword(s):  
Tropical Cyclone ◽  
Indian Ocean ◽  
East Indian ◽  
East Indian Ocean

scholarly journals COMPARISON OF INDONESIAN TUNA LONGLINE FISHING PERFORMANCE WITHIN AND OUTSIDE INDONESIA EXCLUSIVE ECONOMIC ZONE (EEZ)

2017 ◽  
Vol 23 (1) ◽  
pp. 1
Author(s):  
Bram Setyadji ◽  
Irwan Jatmiko
Keyword(s):  
Indian Ocean ◽  
Bluefin Tuna ◽  
T Test ◽  
Exclusive Economic Zone ◽  
Southern Bluefin Tuna ◽  
The Indian Ocean ◽  
The Mean ◽  
Economic Zone ◽  
Tuna Longline ◽  
High Seas

Indonesian tuna longline fleets have been fishing in the Exclusive Economic Zone (EEZ) and high seas of the Indian Ocean for quite some time. However, effort has never been made to separate catch from the EEZ and the high seas as it important for fisheries management. A total of 2,430 set-by-set longline fishing data had been collected by scientific observers based in the Research Institute of Tuna Fishery in Bali since August 2005 to December 2014 on which present analysis was made. The research aims to compare between trend of tuna catch of the EEZ and of the high seas of Indian Ocean. The results show that the mean hook rate of both catches of big eye tuna (BET) and southern Bluefin tuna (SBT) caught in the high seas was significantly higher than that the EEZ (two sample t-test, p<0.05), while for yellow fin tuna (YFT) it was in the opposite direction (two sample t-test, p<0.05). As for albacore (ALB), the mean hook rate value was statistically similar in both fishing grounds (two sample t-test, p>0.05).

scholarly journals Atmospheric microplastic over the South China Sea and East Indian Ocean: abundance, distribution and source

2020 ◽  
Vol 389 ◽  
pp. 121846 ◽  
Author(s):  
Xiaohui Wang ◽  
Changjun Li ◽  
Kai Liu ◽  
Lixin Zhu ◽  
Zhangyu Song ◽  
...  
Keyword(s):  
Indian Ocean ◽  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Abundance Distribution ◽  
The South ◽  
China Sea ◽  
East Indian ◽  
East Indian Ocean
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