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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
Articles
Articles
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; https://doi.org/10.53623/tebt.v2i1.333

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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


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; https://doi.org/10.53623/tebt.v2i1.314

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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