Diversity and abundance of cichlids in Ikere Gorge Reservoir, Iseyin, Oyo State, Nigeria

2021 ◽  
Vol 18 (1) ◽  
pp. 52-56
Author(s):  
S.O. Ajagbe ◽  
R.O. Ajagbe ◽  
O.S. Ariwoola ◽  
F.I. Abdulazeez ◽  
O.O. Oyewole ◽  
...  
Keyword(s):  
Fish Species ◽  
Riparian Forest ◽  
Abundant Species ◽  
Freshwater Ecosystems ◽  
Freshwater Species ◽  
Fishing Villages ◽  
Gorge Reservoir ◽  
Commercially Important ◽  
Sarotherodon Galilaeus ◽  
Fish Species Diversity

Cichlids are highly abundant and commercially important fish in freshwater ecosystems in Nigeria. This study examined the diversity and abundance of cichlids in Ikere Gorge Reservoir. Four fishing villages were randomly selected from 12 fishing villages in Ikere Gorge Reservoir as sampling sites. Cichlids were sampled randomly and examined from fishermen catch in each selected fishing village; were identified with appropriate keys; the weight and abundance of the catches were recorded. The data obtained was subjected to descriptive statistical analysis using SPSS (Version 20.0) software to determine the abundance of fish species. Fish species diversity was carried out by using Palaeontological Statistics (PAST). Eight species of cichlids were sampled in Ikere Gorge but Sarotherodon galilaeus was the most abundant species while the least abundant species was Pelmatolapia mariae. It was observed that, cichlids were  abundant in rainy season than in the dry season. Likewise, cichlids were abundant in Ikere-gorge reservoir but they have low diversity. This may be as a result of unsustainable fishing pressure and deforestation of riparian forest and sedimentation in Ikere-gorge reservoir. Therefore, to maintain sustainable fishing activities and improve cichlids population in Ikeregorge reservoir, unsustainable activities in and around Ikere Gorge reservoir should be put under control. Keywords: Cichlidae; freshwater species; dominant; Sarotherodon galilaeus; Pelmatolapia mariae.

Diets and trophic guilds of demersal fishes of the south-eastern Australian shelf

2001 ◽  
Vol 52 (4) ◽  
pp. 537 ◽  
Author(s):  
C. Bulman ◽  
F. Althaus ◽  
X. He ◽  
N. J. Bax ◽  
A. Williams
Keyword(s):  
Fish Species ◽  
Abundant Species ◽  
Trophic Guilds ◽  
The South ◽  
Important Species ◽  
Trawl Fishery ◽  
South Eastern ◽  
Total Fish ◽  
Wet Weight ◽  
Commercially Important

A total of 8200 stomach samples was collected from 102 fish species caught by trawl or gillnet during research surveys on the south-eastern Australian shelf from 1993 to 1996. Diet compositions were analysed based on percentages of wet weight of prey. Of the total fish examined, 70 species had sufficient stomach samples (i.e. >10) for further analysis. Ten trophic guilds were identified from cluster analysis. Benthic prey dominated the diets. However, analysis on a subset of 28 abundant species that were commercially and ecologically important, showed that pelagic prey was dominant, particularly for 12 quota species. This suggests that pelagic production contributes significantly to the trawl fishery production. Further analysis on the diets of these 28 species found that although fish was more important than invertebrate prey, there was no evidence of significant predation on commercially important species (quota species)by other fish species. A food web diagram was constructed, mostly based on the diet compositions, guild structure and relative abundance of commercially and ecologically important fish species, to show major trophic interactions of the shelf ecosystem.

scholarly journals Reef fish community in presence of the lionfish (Pterois volitans) in Santa Marta, Colombian Caribbean

2015 ◽  
pp. 4989-5003 ◽  
Author(s):  
Rocío García-Urueña ◽  
Arturo Acero P ◽  
Víctor Coronado-Carrascal
Keyword(s):  
Fish Species ◽  
Fish Community ◽  
Abundant Species ◽  
Benthic Organisms ◽  
Thalassoma Bifasciatum ◽  
Pterois Volitans ◽  
Stegastes Partitus ◽  
Important Species ◽  
Point Count ◽  
Commercially Important

ABSTRACT Objective. Fish species community structure and benthic organisms coverage were studied in five localities in Santa Marta where the lionfish is present. Materials and methods. Abundance of fish species, including lion fish, was established using 30 m random visual censuses and video transects; trophic guilds were established according to available references. On the other hand benthic coverage was evaluated using the software Coral Point Count (CPCe) 4.0. Results. Families with higher species numbers were Serranidae, Labridae, and Pomacentridae. Lionfish abundances were low (2.6±2.1 ind/120 m2), but in any case Pterois volitans was observed as the eleventh more abundant species, surpassing species of commercial value such as Cephalopholis cruentata. Species that were found in larger numbers (>100, Thalassoma bifasciatum, Haemulon aurolineatum, Canthigaster rostrata, Abudefduf saxatilis, Chromis cyanea, and Stegastes partitus) were mainly invertebrate eaters, planctivores, and territorial herbivores. Coral coverage showed higher coral percentages in Chengue (69.9%) and Cinto (27.4%), larger sponge percentages in Morro (32.7%); Isla Aguja and Remanso showed the larger figures for abiotic substrate (41.6 and 37%, respectively); corals, sponges, and gorgonians were the components best explaining fish community, but not for the lion fish, which inhabit all studied reef formations. Conclusions. Lion fish is ranked between the 20 more abundant species, with none commercially important species larger, hence no species may qualify as a natural control. Lion fish has as well become a relatively abundant species in Santa Marta reefs, independent of benthic coverage.

scholarly journals Patterns of Spatial Overlap between Non-Indigenous and Critically Endangered Freshwater Fishes from a Mediterranean Biodiversity Hotspot

Diversity ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 233
Author(s):  
Nicholas Koutsikos ◽  
Leonidas Vardakas ◽  
Olga-Ioanna Kalantzi ◽  
Stamatis Zogaris
Keyword(s):  
Fish Species ◽  
Natura 2000 ◽  
Freshwater Ecosystems ◽  
Ecological Impacts ◽  
Critically Endangered ◽  
Freshwater Species ◽  
Freshwater Biodiversity ◽  
Red Lists ◽  
Spatial Overlap ◽  
Mountainous Regions

Non-indigenous fish species (NIFS) can cause severe ecological impacts on the invaded ecosystems and are considered as one of the leading factors of freshwater biodiversity loss. Unraveling the spatial overlap between NIFS and critically endangered (CR) fish species can contribute to targeted conservation actions to minimize the potential negative effects. In this study, we applied geostatistical analyses to investigate the spatial overlap of NIFS against fish species that are designated under the CR status according to the IUCN and the Hellenic Zoological Society (HZS) Red Lists. Distributional data (presence–absence) from 800 records of 52 NIFS were compiled for both lentic and lotic ecosystems of Greece. Our results indicate that freshwater ecosystems under high NIFS richness were located mainly in lowland areas and often near large cities and ecosystems with well-developed commercial and recreational fisheries. On the contrary, low NIFS richness was observed in mountainous regions and in relatively small river basins. Overlapping areas of CR species with moderate to high NIFS richness (1.5–4.3 NIFS per 1 km2) were relatively high (~50%). A quarter of the overlapping areas (24.8%) fall within NATURA 2000 network, where legal management bodies could implement specialized programs to minimize the negative impacts. However, the majority of CR fish species’ distribution remains in unprotected areas indicating that protected areas should be re-designed to include areas containing freshwater species under the highest threatened category. Our findings demonstrate that whole assemblages of fishes are rapidly changing as NIFS spread into Greece and many freshwater ecosystems of outstanding biodiversity conservation value are under significant invasion pressure.

scholarly journals The role of tilapia in food security of fishing villages in Niger state, Nigeria

2011 ◽  
Vol 11 (48) ◽  
pp. 5561-5572
Author(s):  
Ahmed Gomna ◽  
Keyword(s):  
Fish Species ◽  
Fish Consumption ◽  
Primary Source ◽  
Household Consumption ◽  
Freshwater Species ◽  
Survey Period ◽  
Fresh Fish ◽  
Fishing Villages ◽  
Primary Activity ◽  
24 Hour Recall

Fish is generally regarded as a primary source of protein for many poor African fishing villages. Most of the fish consumed in the fishing villages in Nigeria consists of freshwater species such as tilapia. Tilapia previously considered of little commercial value is now being considered a human food. The aim of the present study was to determine the importance of tilapia in the diet of fishing villages in Niger state, Nigeria by examining the household consumption of different fish species. A total of one hundred households in fishing villages in five local government areas (LGA) of Niger state were randomly selected for the study. The households consisted of fifty fishing households where active fishing was the primary activity and fifty non–fishing households (where agriculture was the primary activity). A 24 hour recall was used to obtain the amount of fish consumed by each household, the form of fish cooked (fresh, smoked, dried) and the source of fish (whether the fish was purchased in the market or caught directly by household members from local rivers). A general linear model was used to analyse fish consumption to establish significant (p<0.05) differences in monthly fish consumption between fishing and non-fishing households. A total of 24 fish species were recorded in the diet of the people with tilapia contributing the highest percentage (19% by weight) of the fish consumed. All fishing and non–fishing households consumed fish during the survey period. Fish consumption was significantly higher in fishing than non–fishing households. Fishing households consumed an average of 188g of fish per day (69kg/year) compared with 127g fish per day (46kg/year) for non-fishing households. Household consumption of fish varied during the year. The highest fish consumption occurred in March, 2009 in all the households. There was a negative correlation (r = - 0.124, p = 0.013) between fish consumption and income. The study shows a high preference for fresh fish.

scholarly journals Study on Fish Fauna Diversity of Bhusara maun under Muzaaffarpur district of Bihar

2018 ◽  
Vol 8 (5-s) ◽  
pp. 327-328
Author(s):  
Nishi Kumari ◽  
Ravindra Nath Pathak
Keyword(s):  
Species Diversity ◽  
Fish Species ◽  
Water Body ◽  
Fish Fauna ◽  
Fish Diversity ◽  
Indian Major Carps ◽  
Commercially Important ◽  
Food Value ◽  
Major Carps ◽  
Fish Species Diversity

The present study has been carried from Bhusara maun under Muzaaffarpur district of Bihar”. Fish diversity on this lentic water body has been studied in detail with its food value and commercial status. Twenty eight Fish species of fishes were recorded, which belonged to 20 genera and 14 families. A classified list of fishes has been given. The Indian major carps and few fresh species are commercially important groups in the Bhusara maun Keywords: Fish species, diversity, food value. Commercially important. 

Fish Species Diversity in Lakes

1974 ◽  
Vol 108 (962) ◽  
pp. 473-489 ◽  
Author(s):  
Clyde D. Barbour ◽  
James H. Brown
Keyword(s):  
Species Diversity ◽  
Fish Species ◽  
Fish Species Diversity

CONNECTING GROUND WATER INFLUXES WITH FISH SPECIES DIVERSITY IN AN URBANIZED WATERSHED

2004 ◽  
Vol 40 (5) ◽  
pp. 1269-1275 ◽  
Author(s):  
Luanne Y. Steffy ◽  
Angela L. McGinty ◽  
Claire Welty ◽  
Susan S. Kilham
Keyword(s):  
Species Diversity ◽  
Ground Water ◽  
Fish Species ◽  
Fish Species Diversity

The impact of marine protected areas on temporal stability of fish species diversity

2021 ◽  
Author(s):  
Amanda K. Pettersen ◽  
Ezequiel M. Marzinelli ◽  
Peter Steinberg ◽  
Melinda A. Coleman
Keyword(s):  
Species Diversity ◽  
Protected Areas ◽  
Fish Species ◽  
Marine Protected Areas ◽  
Temporal Stability ◽  
The Impact ◽  
Fish Species Diversity

scholarly journals The hydraulic management of the Barra Bonita reservoir (SP, Brazil) as a factor influencing the temporal succession of its fish community

2007 ◽  
Vol 67 (3) ◽  
pp. 433-445 ◽  
Author(s):  
ML. Petesse ◽  
M. Petrere Jr. ◽  
RJ. Spigolon
Keyword(s):  
Fish Species ◽  
Fish Community ◽  
Abundant Species ◽  
Anthropogenic Stress ◽  
Reservoir Level ◽  
Species List ◽  
Adaptation Capacity ◽  
Reproductive Structures ◽  
Temporal Succession ◽  
Reproductive Compensation

The temporal succession of fish communities allows evaluating the environmental conditions and the adaptation capacity of the fish species to anthropogenic stress in reservoirs. The fish community at Barra Bonita reservoir was sampled in two different periods of the year (dry and rainy) and in three different areas of the reservoir (fluvial, transition, and lentic). The species list was compared to another four lists, trying to detect the transformations of the fish community for the last 15 years. In order to evaluate the adaptation of the present fish community to the hydraulic management of reservoir, the trophic and reproductive structures were studied. Temporal succession analysis shows little change in fish richness of the communities. The number of fish species varies between 23 and 39 for a total of 68 registered species. From this, 27 can be considered constant, 14 accessory and 27 accidental; the main differences observed were for Anostomidae, Loricariidae and Characidae families. In relation to the hydraulic management, we found a fish community stabilized and adapted to environmental stress. This is characterized by the dominance of small-sized fish species of opportunistic diet and high reproductive compensation (r-strategists). The overlap of biological cycles of the most abundant species with the reservoir level fluctuations points to the period from September to March-April as critical for reproductive success and only the species with partial reproductive strategy or parental care are best succeeded. These results, interpreted in the context of the reservoir aging process, indicate that Barra Bonita reservoir is entering a transition phase, between the colonization and aging stages.

scholarly journals Fish species diversity in headwaters streams of Paraguay and Paraná Basins

2007 ◽  
Vol 50 (6) ◽  
pp. 1033-1042 ◽  
Author(s):  
Yzel Rondon Súarez ◽  
Sabrina Bigatão Valério ◽  
Karina Keyla Tondado ◽  
Alexandro Cezar Florentino ◽  
Thiago Rota Alves Felipe ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Environmental Factors ◽  
Fish Species ◽  
Total Species Richness ◽  
Paraná Basin ◽  
Parana Basin ◽  
Number Of Individuals ◽  
Total Species ◽  
Fish Species Diversity

The influence of spatial, temporal and environmental factors on fish species diversity in headwater streams in Paraguay and Paraná basins, Brazil was examined. A total of 4,605 individuals were sampled, distributed in 60 species. The sampled streams in Paraná basin presented a larger total species richness (42) than Paraguay streams (40). However the estimated richness was larger in Paraguay basin (53) than Paraná streams (50). The streams of Paraná basin had a greater mean species richness and evenness, while more individuals per sample were found in the Paraguay basin. Difference between the sub-basins were found in the Paraguay basin, while for the basin of Paraná, richness and evenness vary significantly between the sub-basins, but the number of individuals varied seasonally. The most important environmental factors to species diversity and abundance were altitude, water temperature, stream width and stream depth for both the basins.

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