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Aquaponics is known to be a smart way of producing fish and crops simultaneously; however, there is a paucity of information about the extents of this system's efficiency over other conventional methods of food production. Thus, this study was designed to evaluate the performance of a catfish–pumpkin aquaponics system in comparison with recirculatory and static aquaculture systems (for fish performance), as well as irrigated and nonirrigated systems (for pumpkin performance). Results obtained showed that the production of fish in the aquaponics system was 29% and 75% more efficient than recirculatory and static aquaculture systems, respectively. The survival of the fish was also significantly improved probably due to better water quality in the aquaponics system. With respect to pumpkin production, yield in the aquaponics system was about five times the performance in irrigated land and eleven times those in nonirrigated land. This study gives definitive evidence to support the efficiency of the aquaponics system over other conventional food production methods.

This study investigated the use of electric-shock in inducing triploidy in African catfish Clarias gariepinus. To achieve this, three voltages (9, 12, 21 V) were applied for different durations (3, 5, 10 min). the shock was initiated approximately three minutes after fertilization followed by incubation in ambient temperature. After incubation, hatchability and survival rates were determined while ploidy status of the treatment fishes was confirmed in one-month-old fingerlings using the exclusive triploid range of the erythrocyte major axis previously reported for the same species (11.9-14.9 μm) and by cytogenetic analysis of the chromosome. The results showed triploidy were achieved in 10 to 85% of the treatment groups. A consistent trend of decrease in hatchability and an increase in triploidy rate was observed with increased electroporation voltages and shock durations. The mean erythrocyte major axis length of triploid progenies (3n = 84) was observed to be between 11.3-14.6 μm and was higher than the range of 7.0-10.5 μm recorded for diploid progenies (2n = 56). It was concluded that electric shock can be used to induce triploidy in African catfish C. gariepinus.

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This study determined the density and diversity of water and terrestrial dependent avian species in man-made Putrajaya wetlands, Peninsular Malaysia using the distant point count techniques. A total sum of 36,544 bird’s individuals (25water bird and 75 terrestrial bird species) was identified from November 2016 to July 2018. The overall bird’s density is 1.17 ± 0.04 birds’ ha−1 at 95.00% confidence limit. The terrestrial bird species (TBS) had a higher density (1.35 ± 0.04 birds’ ha−1), while the water bird species (WBS) had a lower density (0.98 ± 0.16 birds’ ha−1). For WBS, Nycticorax nycticorax and Casmero diusalbus recorded the highest (5.31 ± 3.27 birds’ ha1) and least (0.13 ± 0.15 birds’ ha−1) densities respectively. Also, Columba livia and Arachnothera flavigaster recorded the highest (7.15 ± 1.77 birds’ ha−1) and least (0.07±0.02 birds’ ha−1) densities respectively in TBS. The TBS had higher Shannon– Wiener species diversity index (N1 = 5.67), Margalef’s species richness index (R1 = 15.06) and Pielou’s J species evenness index (E = 1.29) in contrast to the WBS (N1 = 3.71; R1 = 4.58 and E = 1.18). The study revealed the potentials of the man-made Putrajaya wetlands to harbour diverse avian species. This implied the needs to conserve this enclave in order to increase the population, perpetuity and sustainability of the avian species.

This paper summarises the current state of knowledge on the landscape of protected areas in Nigeria and elucidates on the status, drivers, effects and solutions to host communities’ dependence on the protected areas towards achieving the Sustainable Development Goal 15.9 and Aichi Biodiversity Target 11 in Nigeria. The present land coverage (15.15%) of Nigeria’s protected areas is highly degraded and far away from the target 4 of the National Biodiversity Strategy and Action Plan (2016 – 2020). This is connected to the fact that protected areas constitute the largest food base for host communities’ survival in Nigeria. Even, despite the rural-urban drift in search of a white-collar job, a larger percentage of Nigeria’s populations are still situated in the rural areas. The participation of the local communities in biodiversity conservation, their wellbeing, culture and livelihood have always been a subject of interest to the stakeholders (local communities, park management, and conservationist) in protected area management due to the role in the sustainability of forest resources. However, three drivers of host communities’ dependence on protected areas in Nigeria were identified – socio-cultural, economic and institutional drivers. The option of human displacement from the protected areas had not yielded any positive result over the years. In conclusion, buffer zone policies have to be formulated and inculcated by affected protected areas authorities into their management framework. Also, adoption of community-based participatory forest management, initiation of forest enrichment programmes in degraded protected areas and harvesting of Non-timber Forest Products (NTFPs) should be encouraged to play diverse contributory roles in the improvement of rural livelihoods.

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In Malaysia, multiple land use by humans has opened the way to substantial loss of wetland ecosystem, and shrinkage of the populations, habitat and food bases of avian species. However, the study of the avian population especially terrestrial birds becomes eminent to understand the complexity of wetlands ecosystem structure, and also develop appropriate management with robust monitoring tools to ensure their ecological sustainability. The study aimed to determine the eco-climatic factors that influenced the occurrence of terrestrial birds and to develop their habitat suitability models in Paya Indah wetlands (PIW) and Putrajaya wetlands (PW), Malaysia. The distance sampling point count technique using stratified random design was employed to survey (from November 2016 to January 2019) and choose 57 and 54 point stations around 14 and 24 lakes of PIW and PW respectively. An automatic linear modelling algorithm and geographic information systems were employed to compute the importance ratios of seventeen eco-climatic factors (hydrology, 9; climatic, 5; waterscape, 1 and landscape, 2). The result showed that some of the observed terrestrial birds individual and estimated indices were significant. The model showed that more than 50% of the land mass were moderately suitable in Paya Indah wetland while 35.22 % were suitable in Putrajaya wetland. Thus, the models’ adoption as management tools would help in the sustenance of the wetlands’ habitat quality and management effectiveness of the terrestrial bird species.