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Tropical Environment, Biology, and Technology

Journal Description

Tropical Environment, Biology, and Technology

Tropical Environment, Biology, and Technology is an international, scientific, peer-reviewed, open-access journal focusing on tropical science especially environment, biology, and technology published biannually online by the Society of Tropical Science and Technology, and Tecno Scientifica.

  • Open Accessfree for readers and authors, with no article processing charges (APC).
  • Rapid Publication: manuscripts are peer-reviewed and a first decision provided to authors approximately 3 weeks after submission.
Open Access
e-ISSN: 3009-0806
Open Access Articles
Microbiological Analysis of Hawked-Cooked Food: Evidence from Ready-to-Eat Food Vendors in Dutse Ultra-Modern Market, Northwestern, Nigeria
by Afeez Oladeji Amoo, Adeniyi Olarewaju Adeleye, Garba Barde Bate, Madu Emmanuel Ijanu, Suleiman Bashir Adamu, Catherine Iyabo Asaju, Idris Ireti Olaitan

Trop. Environ. Biol. Technol. 2024, 2(1), pp 23-33;

These days, public health policy is primarily concerned with the global challenge of food safety. Hawked-cooked foods (HCF) play a vital role in people's everyday food alternatives, as their ever-increasing busy schedules take away the opportunity to eat homemade foods. This study aimed at analyzing the bacteriological quality of HCF sold in Dutse ultra-modern market. This study observed and analyzed the bacteriological quality of the nine (9) most popular foods sold by hawkers in the research region. All samples were analyzed using standard microbiological methods. The total viable bacterial counts in the samples for the reciprocal of dilution 105 ranged between 3.2  106  and 1.40  107 CFU/g, while dilution 107 ranged from 1.50  108 to 1.10  109 CFU/g. A total of twelve bacteria that are of public health importance were isolated and identified from the assayed ready-to-eat foods. All the sampled ready-to-eat foods in this study recorded bacteriological contaminants, which can potentially constitute public health issues. Seven of these bacteria are pathogenic; Bacillus cereus, Staphylococcus aureus, Escherichia coli, Salmonella, Vibro cholerae, Streptococcus pneumoniae, and Klebsiella sp.  Prior to food sampling, most food hawkers interrogated lack western education, demonstrating the low degree of hygiene they practice in the preparation of the hawked foods. Therefore, in order to prevent impending public health catastrophes (food-borne illnesses) that can be brought on by consuming HCF, it is advised that food producers who hawk  ready-to-eat foods adopt hygienic practice in the preparation and serving to improve food safety. Full text

Open Access Articles
Some Aspects of the Biology of Sarotherodon melanotheron and Tilapia guineensis inhabiting Mahin Lagoon, Nigeria
by Adefemi Olatayo Ajibare

Trop. Environ. Biol. Technol. 2024, 2(1), pp 1-13;

Studies on fish biology are important because they help determine the best management strategy to use in order to conserve fish species in their natural habitat. Thus, some aspects of the Biology of Sarotherodon melanotheron and Tilapia guineensis in the Mahin Lagoon were covered in this study. For the study, 121 fish samples were collected. The sex ratio of S. melanotheron (1:1.64) and T. guineensis (1:1.36) showed no significant deviation from the expected 1:1. Fecundity ranged from 243 to 1223 in S. melanotheron and 156 to 600 in T. guineensis with means of 344.39±166.85 and 286.27±114.85 respectively indicating low fecundity in both species. Observed Gonado-Somatic Index (6.40±3.25% for T. guineensis and 5.65±3.31% for S. melanotheron) suggested the peak of gonad maturity. The regression equation of the length-weight relationship indicated that S. melanotheron exhibited negative allometric growth in male (b=1.66, R2=0.63), female (b=2.80, R2=0.83) and combined sex (b=2.55, R2=0.78) while T. guineensis exhibited positive allometry in male (b=3.05, R2=0.97), female (b=3.04, R2=0.95) and combined sex (b=3.04, R2=0.96). The condition factor was greater than 2 for both species. This study also revealed that the fecundity of the two species was size dependent. Examination of stomach fullness revealed that 4.2% and 0.0% of S. melanotheron and T. guineensis had empty stomachs while 20.0% and 3.8% had full stomachs respectively. This study therefore established that the study area was conducive for the fish. Monitoring and regulation of the fisheries is therefore recommended for conservation and management of the study area.    Full text

Open Access Articles
Assessment of Levels and Health Risks of Atmospheric Particulate Matter (PM10) and Associated Gaseous Elements in Selected Locations in Lagos, Nigeria
by Tajudeen Yahaya, Tawakalt Fagbayi, Abdulmalik Abdulazeez, Abdulrazaq Izuafa, Sani Kalgo Abdulrahman, Caleb Obadiah

Trop. Environ. Biol. Technol. 2024, 2(1), pp 34-43;

Particulate matter with a size of 10 micrometers (PM10) poses health risks and thus needs to be monitored in every locality. This study assessed the health risks associated with PM10 and related gaseous elements, including nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3), in the ambient air of selected locations in Lagos, Nigeria. Theselocations included Ikeja, Apapa, Idumota, Odogunyan, Yaba, Obalende, Agege, Oshodi, Oto-Awori, and Ojodu. The average hourly dose (AHD), average daily dose (ADD), and hazard quotient (HQ) of these pollutants werecalculated. The results indicated that PM10 levels (ranging from 48.05±0.97 µg/m3 in Obalende to 115.00±1.74µg/m3 in Apapa) and CO levels (ranging from 12.46±0.84 µg/m3 in Obalende to 58.50±3.64 µg/m3 in Agege) exceeded the WHO permissible limits at all locations (45µg/m3 for PM10 and 7 µg/m3 for CO). NO2 levels (ranging from 0.00 µg/m3 in Yaba and Obalende to 23.98±2.06 µg/m3 in Oshodi) and O3 levels (ranging from 2.25±0.20 µg/m3 in Odogunyan to 38.71±2.41 µg/m3 in Oshodi) remained within permissible limits (25µg/m3 for NO2 and 100µg/m3 for O3) across all locations. The HQ of the ADD for both PM10 and CO (Agege and Oshodi only) exceeded the threshold, suggesting that air quality in these locations may induce toxic effects. These findings emphasize the need forpolicies aimed at controlling pollution in the city. Full text

Open Access Articles
Growth Condition, Length-Weight Relationship and Morphological Diversity of Sarotherodon melanotheron and Tilapia guineensis inhabiting the Coastal Waters of Ondo State, Nigeria
by Adefemi Olatayo Ajibare, Patrick Oluwagbemiga Ayeku

Trop. Environ. Biol. Technol. 2024, 2(1), pp 14-22;

Sarotherodon melanotheron and Tilapia guineensis were studied in Mahin Lagoon and Idiogba in the coastal waters of Ondo State to determine their sizes, length-weight relationships, and condition factors. The mean total length and weight for S. melanotheron were 13.35±1.66 cm and 48.41±20.89 g in Mahin, and 13.44±1.72 cm and 49.96±20.80 g in Idiogba, respectively. Meanwhile, the values recorded for T. guineensis were 16.06±4.83 cm and 104.81±107.94 g in Mahin, and 15.00±3.74 cm and 78.98±81.51 g in Idiogba. This morphological similarity revealed an overlap of data between the populations of the two species in Mahin Lagoon and Idiogba. The regression coefficient (b) of length and weight revealed that S. melanotheron exhibited hypoallometry (b=2.55; a=-2.76; R2=0.78) in Mahin and (b=2.31; a=-2.13; R2=0.78) in Idiogba, while T. guineensis exhibited hyperallometry (b=3.04; a=-4.06; R2=0.96) in Mahin and (b=3.05; a=-4.11; R2=0.92) in Idiogba. The condition factor was greater than 2 for both species, although it was higher in T. guineensis (K=2.53 in Mahin and K=2.34 in Idiogba) than in S. melanotheron (K=2.04 in Mahin and K=2.06 in Idiogba). Therefore, this study revealed that both species were very fat and healthy despite anthropogenic activities in the study area. Full text

Advancements in Green Materials for Concrete in South East Asia: A Mini Review
by Rachel Liong, Surya Dewi Puspitasari, Faisal Saud Binhudayb, Salem Hesham

Trop. Environ. Biol. Technol. 2024, 2(1), pp 44-56;

The rapid growth in the global population necessitated an increase in construction activities to provide shelter for humans, consequently driving the construction industry's significant contribution to the GDP of ASEAN countries. This study specifically examined the utilization of green materials for concrete in Singapore, Malaysia, Indonesia, Thailand, and Vietnam. Construction, being a material-intensive sector, consumed vast amounts of natural resources and generated substantial waste and harmful emissions, posing significant environmental challenges. In response, sustainable development initiatives were prioritized across ASEAN nations to address these issues. Governments and relevant authorities implemented various strategies to promote sustainable practices in construction, including providing financial support to both public and private sectors. Among these practices, the adoption of green materials for concrete stood out as a promising approach for sustainable development in the construction sector. By incorporating recycled aggregates, supplementary cementitious materials (SCMs), and other environmentally friendly alternatives, these countries aimed to reduce resource consumption, minimize waste generation, and mitigate environmental impact. Embracing sustainable construction practices not only promoted environmental stewardship but also contributed to long-term economic viability and social well-being in the ASEAN region. Full text