NOPR Collection:http://nopr.niscpr.res.in/handle/123456789/679882026-10-12T22:33:07Z2026-10-12T22:33:07ZThe ocean heat content in the northwest Indian Ocean regionA Maiyza, IM El-Geziry, TS Dabbous, AI Maiyza, Hhttp://nopr.niscpr.res.in/handle/123456789/680132026-06-22T11:09:24Z2025-04-01T00:00:00ZTitle: The ocean heat content in the northwest Indian Ocean region
Authors: A Maiyza, I; M El-Geziry, T; S Dabbous, A; I Maiyza, H
Abstract: Ocean Heat Content (OHC) is crucial for understanding ocean dynamics. The Northwest Indian Ocean (NWIO) region,
comprising the Southern Red Sea, the Gulf of Aden, the Arabian Sea, and the Equatorial North West Indian Ocean, is
affected by various phenomena, such as upwelling, heat waves, and multi-layer exchange between the Red Sea and the Gulf
of Aden. The spatial and temporal variability of these factors affects upper-layer OHC. OHC in the NWIO region has rarely
been studied earlier. Therefore, this work would be beneficial in filling the knowledge gap and understanding the OHC of
this region. The study displays the horizontal distributions of monthly OHC and yearly signal amplitudes, calculated as the
difference between maximum and minimum values across all months, along with the monthly mean OHC patterns in the
upper 100 m and 300 m layers of the NWIO, based on the available historical seawater temperature and salinity data from
the World Data Centre (WDC-A, Washington D.C.), WDC-B (Moscow) and the Egyptian National Oceanographic Data
Centre (ENODC). The region exhibited a similar pattern of monthly average OHC in the upper 100 and 300 m layers, except
within the Equatorial North West Indian Ocean zone. In addition, the lower layer within the Red Sea exhibited a different
pattern during the winter and transitional months. The NWIO region demonstrated homogeneous annual OHC signal
amplitudes, except for the Arabian Sea, which has the highest annual amplitude at both layers.
Page(s): 175-1822025-04-01T00:00:00ZEvaluating arsenic and heavy metal contamination in estuarine sediments of the Southern Caspian Sea, IranBagheri, Hhttp://nopr.niscpr.res.in/handle/123456789/680122026-06-22T11:07:16Z2025-04-01T00:00:00ZTitle: Evaluating arsenic and heavy metal contamination in estuarine sediments of the Southern Caspian Sea, Iran
Authors: Bagheri, H
Abstract: Coastal and estuarine ecosystems face increasing threats from heavy metal pollution originating from industrial and
agricultural activities, presenting significant environmental and public health risks. This study investigates arsenic and heavy
metal contamination within surface sediments of eight major rivers discharging into the southern Caspian Sea: Gorganrud,
Qarasu, Tajan, Babolrud, Sardabrud, Safarud, Cheshmeh Kileh, and Sefidrud. Twenty-four surface sediment samples,
collected from upstream, river mouth, and near-shore zones, were analysed to assess spatial variations. A sediment core
from Gorgan Bay, providing a ~1400-year depositional record, was also examined to understand historical trends.
Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to determine trace metal concentrations, along with
grain size distribution and organic matter content analyses. Arsenic concentrations varied spatially, ranging from 0.3 to
18.45 mg/kg. Pollution indices, including modified contamination degree (mCd) and Pollution Load Index (PLI), revealed
slight-to-moderate pollution in several rivers, while the Ecological Risk Index (RI) indicated consistently low ecological
risk. Enrichment Factor (EF) analysis identified both natural and anthropogenic influences contributing to heavy metal
accumulation. These results underscore the complex interplay of factors driving heavy metal contamination in the Caspian
Sea estuaries, emphasising the need for long-term monitoring programs to support effective coastal management and
mitigation efforts within this ecologically vital region.
Page(s): 183-1942025-04-01T00:00:00ZDiversity and assemblage pattern of finfish and shellfish along the Sitakunda coast, Bay of BengalI Ara, SNasiruddina, MM Sarker, MA Azadi, Mhttp://nopr.niscpr.res.in/handle/123456789/680112026-06-22T11:03:25Z2025-03-01T00:00:00ZTitle: Diversity and assemblage pattern of finfish and shellfish along the Sitakunda coast, Bay of Bengal
Authors: I Ara, S; Nasiruddina, M; M Sarker, M; A Azadi, M
Abstract: Finfish and shellfish diversity at three sampling sites of the Sitakunda coast of the Bay of Bengal were studied monthly from March 2016 to February 2018, wherein 355181 fishery individuals were enumerated from 554 catch samples collected by 13 different types of gears. Out of a total of 168 fish species identified, 124 were finfish species (13 orders and 47 families), and 44 were shellfish species (2 orders and 8 families). The order Decapoda (65.17 %) occupied the highest position, followed by Perciformes (20.59 %), Scopeliformes (5.37 %), Clupeiformes (4.97 %), Siluriformes (1.35 %), Pleuronectiformes (1.18 %) and the remaining 9 orders contributed only 1.36 % of the total sampled population. Oxyurichthys keiensis is reported as a new record for Bangladesh. The highest numbers of individuals during pre-monsoon were recorded at Station II, and the lowest numbers of individuals from Station III during the post-monsoon season. Diversity indices showed no significant difference across years, but a significant differences were observed among stations. Stations I and II showed comparatively higher species abundance and diversity. According to the evenness index, the population of Station II was the most stable among the three stations. Analysis of Similarity (ANOSIM), Similarity Percentage Analysis (SIMPER), cluster analysis, and non-metric multidimensional scaling revealed clear differences in species populations across seasons.
Page(s): 195-2062025-03-01T00:00:00ZLength-weight relationships of five migratory fish species from the Narmada estuary, Gujarat, IndiaBhakta, DK Das, BP Kamble, SSolanki, SChandra, GPandit, ASamanta, Shttp://nopr.niscpr.res.in/handle/123456789/680102026-06-22T10:59:08Z2025-04-01T00:00:00ZTitle: Length-weight relationships of five migratory fish species from the Narmada estuary, Gujarat, India
Authors: Bhakta, D; K Das, B; P Kamble, S; Solanki, S; Chandra, G; Pandit, A; Samanta, S
Abstract: The present study estimated the Length-Weight Relationships (LWRs) of Boleophthalmus dussumieri, Ilisha megaloptera, Aulopareia ocellata, Tenualosa ilisha, and Thryssa stenosoma. The fish samples were collected from the estuarine stretch (72 km) of the river Narmada from November 2018 to December 2020 seasonally, using bag nets (10 mm cod-end mesh size), stake nets (5 – 10 mm mesh size), and stick traps (locally known as fanda). The value of exponent b for LWRs ranged from 2.641 to 3.546. This study presents the first reference on LWR for T. stenosoma and the first LWRs for three other species (viz., B. dussumieri, I. megaloptera, and A. ocellata) in the Narmada estuary. Additionally, the study established a new maximum length record for T. stenosoma. The LWRs, along with other biological parameters of the respective species, serve as baseline information for the management and conservation of both migratory and local fishes.
Page(s): 207-2122025-04-01T00:00:00Z