Simon K. Das

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Simon K. verified their affiliation via an institutional email.

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• PhD
• Research Fellow at James Cook University

Climate change has emerged as a critical factor influencing the survival and distribution of endangered fish species in Asia. This review examines the multifaceted impacts of climate change on these vulnerable aquatic populations especially fish. Rising temperatures, altered precipitation patterns, and increasing frequency of extreme weather events...

Heatwaves are becoming more common and severe due to rising CO2 and temperature levels, while changes in precipitation patterns have significant consequences for ecosystems and aquatic creatures, including fish. This study assessed the growth parameters of the valuable mahseer, a key species in fisheries and ecological balance, under different temp...

Context Mahseer fish, listed as Data Deficient with a decreasing population trend in The IUCN Red List of Threatened Species 2018, is regarded as a valuable organism. Aims This study aims to evaluate the current state of mahseer research in Asia through scientometric analysis. Methods We utilised the Web of Science (WOS) database, initiated in 19...

A 60-day experimental trial was conducted to evaluate the effect of different stocking densities, probiotic supplementation, and a biofloc system on the growth and physiological responses of Puntius sophore in laboratory conditions. P. sophore (8.64 ± 1.24 g) was obtained from the Brahmaputra River, Mymensingh, and immediately transferred to a flow...

Catfish are a highly diverse group of fish that are found in various regions across the globe. The significance of catfish culture extends to various aspects, including food security, economic advancement, preservation of cultural legacy, and ecological stewardship. The catfish industry is presently encountering unprecedented challenges as a conseq...

Current water warming and freshwater acidification undoubtedly affect the life of aquatic animals especially ammonotelic teleost by altering their physiological responses. The effect of temperature (28 °C vs 32 °C) and pH (7 vs. 5) on the metabolic compromising strategies of Hoven's carp (Leptobarbus hoevenii) was investigated in this study. Fishes...

A global interest in Silver Barb (Barbonymus gonionotus) cultivation has arisen because of a combination of declining wild stock and a steady increase in demand and market value. The purpose of the current investigation was to evaluate the impact of extreme water temperature changes on growth, hemato-biochemical responses, pepsin enzyme activity an...

A 60-day feeding trial was done to investigate the effects of iron and zinc nanoparticles (Fe-NPs and Zn-NPs) on the growth and physiology of Rohu, Labeo rohita. The study aimed to determine the optimal levels of Fe-NPs and Zn-NPs that could improve the growth performance and nutrient metabolism of the fish. Five experimental diets containing va...

The level of carbon dioxide, which resembles water acidification, is critical to the success of juvenile fish production. The growth, skeletal deformities, and blood parameters of the economically important freshwater fish mahseer, Tor tambroides, were assessed in different concentrations of pCO2 (400, 700, and 1000 µatm pCO2). The highest growth p...

Microalgae are very important organisms as primary producers and have a wide range of applications in areas such as aquaculture, pharmaceuticals, medicine, biofuels, and others. In this study, the effect of temperature and salinity on growth, biomass, proximate composition, and lipid production of Chaetoceros calcitrans (Paulsen) and Thalassiosira...

In Bangladesh, the pool barb ( Puntius sophore ) is a significant small indigenous species. However, there is no report on the reproductive physiology and broodstock development of it. Determining various aspects of reproductive biology and looking into how different dietary regimes and stocking densities affect growth and haematological responses...

Suitable stocking density of Gulsa tengra (Mystus cavasius) was observed by measuring growth performance, production, and survival in nylon net cages for 120 days in Chalan Beel floodplain ecosystem. Fry of Gulsha tengra (5.55 ± 0.49 g in weight) were stocked into 6 × 3 × 2-m (36 m 3) floating net cages with treatments: T 1-50, T 2-100, T 3-150, an...

This systematic review aimed to synthesise the existing studies regarding the effects of ocean acidification (OA) on seaweed aquaculture. Ocean acidification scenarios may increase the productivity of aquacultured seaweeds, but this depends on species-specific tolerance ranges. Conversely, seaweed productivity may be reduced, with ensuing economic...

Simple Summary The commercially popular Sabah grouper has gained attention due to its high growth rate. Our preliminary study briefly reported how temperature and diet affect gastric emptying time and specific growth rate of hybrid Sabah grouper; however, a comprehensive study on gastrointestinal evacuation GE (Gastrointestinal time together with g...

Benthic diatoms are important components of marine shallow-water habitats that may affect primary production, stabilize sediment, and produce extracellular polymeric substances. Ben-thic diatoms are useful for estimating the trophic status of marine ecosystems. In this study, we investigated the diversity and abundance of benthic diatoms to integra...

Ellochelon vaigiensis (squaretail mullet) adapts to a wide salt spectrum, grows quickly and is easy to raise with other species, so it is the object of attention in aquaculture. Information on the biology and ecology of the species, diet, in particular, is still scattered. Here, we explore the feeding habit, feeding intensity, and food composition...

Stocking larger sized fish in fattening along with good aquaculture practices (GAP) are considered potentials for achieving sustainable and safe fish production under the climatically challenged drought-prone areas where the maintenance of optimal water level throughout the culture period is a real obstacle. To be sustainable, fattening requires op...

The study aims to afford a deeper knowledge on reproductive biology of Mystus bleekeri from Surma River, Bangladesh in a multidisciplinary way. Though, the species is in demand as food and ornamental fish in Bangladesh but still now comprehensive details on reproductive biology of this species is scanty. Total 600 fish samples were derived from com...

The study was aimed to investigate the current status and threats of fisheries resources in the Kura River, Bangladesh. Monthly fish catch surveys were carried out from December 2015 to November 2016 in four catchment areas at Hasinar-ghat, Kandir-dor, Pulertol, and Barartok. In addition, questionnaire interviews and focus group discussions (FGD) w...

The present study was carried out to analyse the effect of water temperature on two components: (1) growth performance, and (2) gastric emptying time (GET) of African catfish Clarias gariepinus fingerlings. After 70 days, it was observed that experimental temperatures had no significant effects on the growth performance parameters, except for food...

post-monsoon at four sampling stations in Karatoya River, Bangladesh. A total of 54 phytoplankton species were recorded under four classes, viz. Chlorophyceae (21 species) Cyanophyceae (16 species), Bacillario-phyceae (15 species), and Euglenophyceae (2 species). A significantly higher total cell density of phyto-plankton was detected during the pr...

The dog conch, Laevistrombus turturella, is an important marine resource of ecological and economic importance in the Southeast Asian region. Natural populations of L. turturella are under threat due to development and overexploitation, so efforts should be taken in culturing this species for commercial and conservation purposes. This study aimed t...

The economic expansion of estuarine mud crab Scylla olivacea necessitated for the inclusive research on its biological characteristics, especially morphological features. This study explored the gender- specific growth pattern and condition factors of S. olivacea from the coastal waters of Sundarbans, Bangladesh. A total of 360 S. olivacea were col...

Microalgae have been got high attention due to its potentiality in aquaculture as live feed, and in industries as ingredients for pharmaceutical, cosmetics, and biofuel industries. The objective of this study was to know the optimum culture condition for profuse growth and biochemical composition of Tetraselmis suecica under two parameters: tempera...

Grouper aquaculture has emerged as a promising food production sector on the basis of the belief that it can lessen the pressure on overfished populations, particularly in the Asia-Pacific. This review provides an outline of the temperature physiology of aquacultured groupers in tropical and subtropical regions as described in 34 research articles...

Aim: This study explores the influence of temperature and diet on pepsin enzyme activity in TGGG hybrid groupers. Methodology: Two hundred TGGG groupers (body weight 200±10 g; total length 22.5±1 cm) were equally distributed in three rearing tanks (1500 l capacity). After three weeks of acclimatization, the groupers were kept in 40 tanks (5 fish pe...

Aim: Landmark-based truss network system was applied to examine the morphometric and meristic differences among four different populaces of Macrognathus aculeatus namely; Dhakuriabeel, Jashore (DBJ); Arial Kha River, Madaripur (AKRM); Nabaganga River, Jhenaidah (NRJ); Kopotakkha River, Jashore (KRJ) in Bangladesh. Methodology: Completely 80 samples...

The Asian catfish Mystus bleekeri is a popular food fish along with favored as an ornamental fish in Bangladesh. Till now detailed report on stomach contents, trophic level, length-weight relationship and condition factor of this fish species in the agro-climatic context of Bangladesh is lacking. Hence, the aims of this study were to describe the s...

The effects of two waste sources, red hybrid tilapia (Oreochromis sp.) and whiteleg shrimp (Litopenaeus vannamei), and two drying methods (freeze-drying and oven-drying) on the proximate chemical composition of bioflocs were investigated. In total, four kinds of experimentally treated bioflocs were compared to identify the best waste source and dry...

Increased acidification has shown to bring negative impacts on marine fish. Currently, fish with scales have been extensively investigated, whereas a few systematic studies have been carried out for investigating impacts of acidified environment towards the growth of scaleless fish. Thus, this research aimed to evaluate carbon dioxide, CO2‐induced...

Elevated ocean water temperature influences the physiological properties of fishes. This study is expected to characterize the oxygen consumption rate (OCR) and gill morphology in different temperature in hybrid grouper, tiger grouper × giant grouper (TGGGH). TGGGH specimens were distributed into four temperature groups starting from 22, 26, 30 and...

Trawl fishing contributes to majority of the total fishes’ landings, supporting the choice of using age, growth determination, and condition factors (K) as part of the monitoring method for the fishes in Malaysia waters. This research specifically examines the use of age, length-weight relationship (LWR), and K to monitor the status of the commerci...

Understanding intraspecific phenotypic plasticity is a prerequisite of stock identification, evolutionary studies, sustainable utilization, and fishery conservation. In this study, intraspecific phenotypic plasticity was assessed in terms of the external features (i.e. meristic, morphometric, and truss-based morphometrics) of the wild Nandus popula...

Understanding intraspecific phenotypic plasticity is a prerequisite of stock identification, evolutionary studies, sustainable utilization, and fishery conservation. In this study, intraspecific phenotypic plasticity was assessed in terms of the external features (i.e. meristic, morphometric, and truss-based morphometrics) of the wild Nandus popula...

Karatoya River is an important freshwater system that is home to different types of fish species. In the present study, the seasonal abundance and diversity indices of fish assemblage and their relationship with physicochemical parameters were studied. Fifty-four fish species were recorded from four stations for 12 months. The highest number of fis...

The research was conducted to develop the domestication technique of Monopterus cuchia collected from Sherpur district, Bangladesh. A total of 300 young M. cuchia (average 95±6.4 g) was reared under nine treatments as earthen pond with dead fish (EpDf), earthen pond with live fish (EpLf), earthen pond with formulated feeds (EpFf), mud treated plast...

An observation on the seasonal distribution of gastropod molluscs in relation to some environmental variables was made in the intertidal seashore water of Cox's Bazar, Bangladesh. A total of 8253 individuals of gastropods representing 34 species under 21 families and 4 orders were identified. The Shannon-Weaver diversity, Pielou's evenness and Marg...

The study was conducted to investigate the length-weight, length-length, Fulton and relative condition of critically endangered riverine catfish Rita rita. A total of 151 specimens of both sexes were collected during July 2018 to June 2019 from Surma River, Bangladesh. Each specimen was weighted (g) and measured (cm) and length-weight relationship...

Temperature- and prey-specific gastrointestinal evacuation times and gastrointestinal emptying rates were estimated for Lutjanus malabaricus under laboratory condition by using X-radiography and serial slaughtering techniques. Fish were collected from Pulau Ketam, Selangor, Peninsular Malaysia and subjected to four different experimental temperatur...

An observation on the seasonal distribution of gastropod molluscs in relation to some environmental variables was made in the intertidal seashore water of Cox's Bazar, Bangladesh. A total of 8253 individuals of gastropods representing 34 species under 21 families and 4 orders were identified. The Shannon-Weaver diversity, Pielou's evenness and Marg...

The oxygen consumption and wellbeing of hybrid grouper Epinephelus fuscoguttatus × E. lanceolatus (TG × GG) juveniles were evaluated after 60 days of being exposed to different salinities (10, 15, 20, 25, and 30 psu) in triplicate (20 fish / tank; 55.0 ± 1.0 g body weight; 12.0 ± 0.5 cm total length). The fish were fed daily with commercial pellet...

This study is conducted to examine the impacts of different rearing temperature and diet variation on haematological and serum biochemical parameters on the juvenile Lutjanus malabaricus, a commercially important fish species in Malaysia. Fish (16-18 cm) were divided into eight treatments (4 temperatures × 2 diets) each with three replicates of fiv...

Length-weight relationship (LWR), condition factors, and trophic level of Zenarchopterus buffonis from the coastal waters of Malaysia were evaluated between November 2013 and March 2014. Three hundred individuals of Z. buffonis ranging between 8.7−16.0 cm total length and 3.67−22.19 g body weight were investigated in this study. The length-weight r...

Carbon dioxide (CO2) concentrations at the ocean surface are in approximate equilibrium with the atmosphere. Consequently, the amount of CO2 dissolved in oceans increases with increasing atmospheric CO2 concentrations. Through ocean acidification, increase uptake of CO2 at the ocean surface lowers the ocean pH level. The availability of dissolved c...

Hybrid grouper (Epinephelus fuscoguttatus [TG] × E. lanceolatus [GG]) juveniles were evaluated in terms of their blood hematology and biochemical levels after 60 days of exposure to different temperatures (22 °C, 26 °C, 30 °C, and 34 °C) in triplicate (20 fish/tank; body weight 200 ± 15 g; length 22.5 ± 1 cm). The fish were fed daily with commercia...

This study is conducted to examine the impacts of different rearing temperature and diet variation on haematological and serum biochemical parameters on the juvenile Lutjanus malabaricus, a commercially important fish species in Malaysia. Fish (16-18 cm) were divided into eight treatments (4 temperatures × 2 diets) each with three replicates of fiv...

This study tested the oxygen consumption rates (OCR), energy, and thermal coefficient of juvenile Lutjanus malabaricus (60 fish, size: 4.53 ± 1.14 g) at four temperatures of 22, 26, 30 and 34 °C. During 30 days of experimental period 5 fish tank-1 were reared at four temperatures with three replicates in intermittent flow respirometers in a recircu...

The growth, gastric emptying time (GET), and oxygen consumption rate (OCR) of the commercially important freshwater mahseer, Tor tambroides, were evaluated under five temperatures (22 °C, 24 °C, 26 °C, 28 °C, and 30 °C) in triplicates with 15 fish per replication in a controlled laboratory condition. After 12 weeks, the body weight gain (BWG), spec...

In this study we analyzed the effects of water temperature and diet on the growth properties and gastric emptying period of juvenile Malabar blood snapper (Lutjanus malabaricus) over a 30 day experimental period. Fish were collected from a local hatchery of Pulau Ketam, Selangor, Malaysia and immediately transferred to flow-through sea water system...

A survey was conducted on the different type and size of fishing gears and crafts that were used in Tulsiganga river, Bangladesh. The survey was based on interviews with the local fishermen and secondary data collected from the local fisheries offices. The collected data reported a total of six distinguishing fishing nets with moderate mesh sizes,...

This study aims to elucidate the gastric emptying process of clownfish fed on artificial diet using two gastric evacuation models and to determine the pepsin activity in the digestion process in relation to feeding time. Regression analysis was used to evaluate the adequacy of 2 models; Anderson’s [S t = S o (1-S o(α-1) ρ(1-α)t) 1/(1-α) + ξ ] and G...

An investigation on morphometric and meristic variation of Zenarchopterus buffonis (Valenciennes, 1847) from coastal waters of Malaysia has been conducted between April 2011 and May 2013. A total of 300 fish specimens was collected from five different areas, viz. Tg. Belungkor, Johor; Sg. Likas, Sabah; Klang, Selangor; Matang, Perak and Langkawi, K...

The size at the onset of maturity of the blue crab (Portunus pelagicus) is an important reference for decision making in fisheries management. The size at 50% sexual maturity (SOM 50) was investigated for crabs from the opposite coasts (east and west) of peninsular Malaysia. A total of 1554 and 1546 crabs from Kuala Kedah (west) and Mersing (east),...

The effects of salinity on the gastric emptying time (GET) and absorption of nutrient along the alimentary tract of tiger grouper (TG) × giant grouper (GG) (Epinephelus fuscoguttatus × E. lanceolatus) hybrid were studied. Juveniles TG×GG hybrid grouper (10.0 ± 0.5 cm total length; 50.5 ± 2.0 g) were reared in different salinities (10, 15, 20, 25 an...

The growth pattern, diet and reproductive biology of the clownfish Amphiprion ocellaris collected from waters of Pulau Tioman were investigated. The length-weight relationship showed an isometric growth pattern (b = 3) in A. ocellaris. The stomach contents mainly consisted of zooplankton and algae, which showed that the fish is omnivorous and was c...

A total of 330 pieces of mud crab (Scylla serrata) were sampled from North of Sundarban, Bangladesh for one whole year from February 2014 until January 2015. The average diet item observed in the stomach consisted of bivalves (21%), detritus (12%) and gastropods (5%) with a higher amount of crustaceans (38%). It was also observed that the higher ac...

The newly developed hybrid grouper: tiger grouper (Epinephelus fuscoguttatus) × giant grouper (Epinephelus fuscoguttatus) (TG×GG), has a high resistance towards different environmental condition (eg. in euryhaline environment) due to its genetic improvement. This study aims to investigate the effects of different salinities (10, 15, 20, 25 and 30 p...

In this study, length-weight and length-length relationships of common carp (Cyprinus carpio L.) in the middle and southern Iraq provinces were determined. Fish specimens were procured from seven provinces from July to December, 2015. A negative and positive allometric growth pattern was obtained, where the total length (TL) ranged from 25.60 cm to...

An integrated experiment was performed on juvenile Malabar blood snapper (Lutjanus malabaricus) to investigate the effect of temperature and diet in their pepsin activities in relation with digestive somatic index (I DS) and relative gut length (RGL). One hundred twenty L. malabaricus juvenile (13-15 cm) were equally distributed among four exposed...

The present study was carried out to investigate the stomach volume, gastric motility, gastric emptying time and gastric emptying rate of the spotted scat fish, Scatophagus argus in laboratory conditions. Stomach volume was examined using freshly caught of various fish sizes by ligatured stomachs at the tips of the burette. Stomach volume is correl...

A yearlong study was carried out to assess the influences of physico-chemical parameters on the temporal and spatial dispersal and biodiversity status of catfishes in the Kushiyara River, Bangladesh. Five fishing boats equipped with various fishing gears namely seine net, gill net, lift net, and cast net were used fortnightly to harvest fish. Water...

The influence of salinities and diet on growth performance of tiger grouper (Epinephelus fuscoguttatus) × giant grouper (E. lanceolatus) (TG×GG hybrid), was investigated. TG×GG hybrid (10.0 ± 0.5 cm initial length and 50.5 ± 2.0 gram initial weight) were subjected to different salinities (10, 15, 20, 25 and 30 part per thousand (ppt)) and two diets...

The effects of organic and commercial feed meals on water quality and growth of Barbonymus schwanenfeldii (lampam fish) were studied. Experiments were carried out using organic and commercial feed for 16 weeks. During the experimental period, water quality which includes dissolved oxygen (DO), pH, chemical oxygen demand (COD), biochemical oxygen de...

Tinfoil barb, Barbonymus schwanenfeldii is a commercially important freshwater fish, which is found in the sub-tropical and the tropical regions like Malaysia. Despite the commercial importance, research on the growth performance of B. schwanenfeldii is yet to be explored. This study aimed to determine the growth performance which includes the surv...

Wild stocks of endangered mrigal carp, Cirrhinus cirrhosus (Bloch 1795), continues to decline rapidly in the Indo-Ganges river basin. With an objective to evaluate its population status, landmark-based morphometric and meristic variations among three different stocks viz., hatchery (Jessore), baor (Gopalganj) and river (Faridpur) in Bangladesh were...

The present study was carried out to investigate the length-weight relationship, condition factor and TROPH of spotted scat, Scatophagus argus collected from the fish landing centre at Gelang Patah, Johor. The population growth pattern of scats was allometric negative (b < 3) indicated that the weight increment was lesser than length increment. The...

This study was carried out at Tasik Chini where the effects of different feeds on growth form of B. schwanenfeldii were calculated using length weight relationship analysis (W = aLb). The results denotes that feeding high protein diet (32% protein) fish represent positive allometric growth (b > 3) while feeding lower protein diet (23 and 28% protei...

The effects of temperatures (22, 26, 30 and 34°C) and diets (commercial pellet and shrimp) on the growth properties and gastric emptying time (GET) of the tiger grouper×giant grouper (TGGG) hybrid were analyzed over a 30day experimental period under controlled laboratory conditions. Food consumption (FC), food conversion rate (FCR), specific growth...

Water bodies often receive agrochemicals indiscriminately, but we know little about the effects of agrochemicals on the flora and fauna of the water bodies. In this study we assess the direct effects of pesticides and fertilizer on the fish production and biodiversity of two important beels; Hilna beel and Kumari beel of Rajshahi district, Banglade...

In this study we aimed to analyze the effects of water temperature and diet on the length-weight relationship and condition of juvenile Malabar blood snapper Lutjanus malabaricus over a 30-d experimental period. The experiment was conducted in the laboratory using a flow-through-sea-water system. The fish were subjected to four different temperatur...

The absence of a stomach in halfbeaks (Hemiramphidae) does not restrain their capability in digesting food item. Halfbeak (Zenarchopterus buffonis) is known to have a wide spectrum of dietary preference. The present study investigates the activity of four digestive enzymes along the gut of halfbeaks to determine how they digest their diets as oppor...

This study provides an overview of the current resources and fisheries status of the Hail haor, and identifies the scope of opportunities to evolve existing fisheries management strategies, focusing on fish biodiversity conservation. Hail haor is one of the largest, most important wetland in the North East Bangladesh, and covers an area of about 18...

The growth form and condition of the tiger grouper × giant grouper (TGGG) hybrid were evaluated under four temperatures (22°C, 26°C, 30°C, and 34°C) and two diets (pellet and shrimp). The growth form of fish was determined over a 30 day experimental period using the length-weight relationship (LWR) method. The TGGG hybrid grouper exhibited a negati...

Reproductive biology of the introduced sailfin cat fish Pterygoplichthys pardalis in the Langat River of peninsular Malaysia was studied. Fish samples were collected monthly from Langat River during March 2003-June 2004. The sex ratio observed for P. pardalis was female-biased with 1: 2. Gonadal maturity stage is achieved at 12.5 cm standard length...

This study attempted to examine the gastric evacuation process in clownfish fed on artificial diets in laboratory condition. 60 fish were fed till satiation after being deprived from food for 72 hours. Model of satiation meal were initiated to predict the maximum food intake for fishes of various sizes. The gastric emptying time was estimated using...