Spatio-temporal variability of chlorophyll-a in response to coastal upwelling and mesoscale eddies in the South Eastern Arabian Sea

Intra-annual variability of the Arabian Sea high salinity water mass (ASHSW) in the South Eastern Arabian Sea (SEAS) and Gulf of Mannar (GoM) are addressed in this paper by utilisng the monthly missions carried out onboard INS Sagardhwani during 2016-17. Our observations revealed that the ASHSW was evident along the SEAS irrespective of seasons, whereas in the GoM the presence of ASHSW was observed during winter. The processes such as downwelling/up-welling, coastal currents, intrusion of low saline waters, stratification are clearly affects the spreading of the ASHSW. The characteristics such as core salinity value, depth and thickness of ASHSW exhibited remarkable spatio-temporal variability. Lateral mixing with the low saline waters in the region during winter reduces its core salinity. The intrusion of low saline waters was clearly seen upto 15 ON but the intrusion of low saline waters is not flowing through the GoM. The interface between the ASHSW and the prevailing low saline waters showed strong horizontal gradients of salinity. The presence of the ASHSW makes difference in the SLD and the below layer gradient which is sufficient to complicate or influence sound transmission. The spatio temporal variability of the ASHSW and its acoustic relevance are documented in this paper.

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Response of macrozoobenthic communities to summer monsoon upwelling and related hypoxia in the south eastern Arabian Sea shelf

Marine Environmental Research ◽

10.1016/j.marenvres.2021.105278 ◽

2021 ◽

Vol 166 ◽

pp. 105278

Author(s):

K.U. Abdul Jaleel ◽

Usha V. Parameswaran ◽

Aiswarya Gopal ◽

Chippy Khader ◽

V.N. Sanjeevan ◽

...

Keyword(s):

Summer Monsoon ◽

Arabian Sea ◽

The South ◽

South Eastern ◽

Eastern Arabian Sea

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Functional approach reveals low niche overlap among common deep-sea fishes from the south-eastern Arabian Sea

Deep Sea Research Part I Oceanographic Research Papers ◽

10.1016/j.dsr.2016.11.011 ◽

2017 ◽

Vol 119 ◽

pp. 16-23 ◽

Cited By ~ 4

Author(s):

K.V. Aneesh Kumar ◽

V.M. Tuset ◽

Hashim Manjebrayakath ◽

K.S. Sumod ◽

M. Sudhakar ◽

...

Keyword(s):

Deep Sea ◽

Arabian Sea ◽

Niche Overlap ◽

Functional Approach ◽

The South ◽

South Eastern ◽

Eastern Arabian Sea

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First report on the diet and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) from the south-eastern Arabian Sea

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315421000771 ◽

2021 ◽

pp. 1-11

Author(s):

Nitin Kanji Suyani ◽

Mridula Rajesh ◽

Kothanahally Mallegowda Rajesh

Keyword(s):

Reproductive Biology ◽

Arabian Sea ◽

Feeding Habits ◽

Gonadosomatic Index ◽

Biological Information ◽

The South ◽

Spawning Period ◽

South Eastern ◽

Eastern Arabian Sea ◽

Males And Females

Abstract The feeding habits and reproductive biology of red-toothed triggerfish Odonus niger (Ruppell, 1836) was analysed from 449 specimens collected from the Karnataka coast of the south-eastern Arabian Sea. Of the total stomachs examined, only 54 (12%) were empty and 395 contained food remains. The diet comprised crustacean remains (48.0%), zooplankton (21.4%), algae (16.5%), fish remains (6.1%) and cephalopod remains (5.3%) along with partially digested matter (2.3%) and detritus (0.4%). The species was found to be a generalist feeder and an omnivore. The overall sex ratio between males and females (1: 0.44) was significantly (P < 0.05) different. Histological examination of the ovaries indicated asynchronous ovarian development in females, with males maturing earlier than females. The gonadosomatic index (GSI) patterns of males and females, and the presence of ripe ovaries and spermatozoids suggested that April–May is the peak spawning period. The absolute and relative fecundity estimates ranged from 16,464–312,420 eggs and 251–2812 eggs g−1 respectively. Fecundity was positively correlated with total length and body weight. The biological information on diet composition and reproductive traits provided for the first time in this study can facilitate conservation, management and sustainable exploitation of this species in the study area.

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