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Publications (65)
ABSTRACT: The study examined the diversity of Clupeidae species in the New Calabar River, Rivers State, Nigeria. Fish samples were collected monthly between May and October 2024 with the assistance of fishermen using various fishing gear. A total of 155 individuals belonging to the Clupeidae family were recovered and identified. Several ecological...
The growth patterns, sex ratio, and condition factor of Oreochromis niloticus species from Choba, Ogbogoro, and Iwofe landing sites along the New Calabar River, Rivers State, Nigeria, were investigated. Fish samples were collected with the aid of fishermen using various fishing gears for a period of six months (June to November 2024). 283 Oreochrom...
The preference for smoked fish by Nigerians has made it imperative that the quality of smoked fish product be assessed during storage to reduce the loss associated with storage by bacteria which has a direct effect on the nutrient content of the fish. This study aimed to examine the preservative potentials of lemon peel oil on smoked Clupeids, Ethm...
The study examined the preservative potentials of lemon peel oil for smoked Clupeids, Ethmalosa fimbriata and Sardinella maderensis in combination with packaging materials on the chemical composition. Four hundred samples (400: 200 each of both fish samples) were divided into two: one part was coated with lemon peel oil (packaged and unpackaged in...
This study was conducted to assess fishermen's perspectives on the massive fish kill incident in coastal waters in Rivers State, Nigeria. Primary data were collected using questionnaires from 101 randomly selected fishermen and the data were evaluated using descriptive statistics. The results showed that fishing was the main occupation of the respo...
This study aimed to examine the preservative potentials of lemon peel oil on smoked clupeids, Ethmalosa fimbriata and Sardinella maderensis and its resultant effect on the chemical components. Two hundred samples, of which 100 each; were divided into two and a part coated with the essential oil while the other part was not (both bonga and sardine)....
This study was conducted to assess fishermen's perspectives on the massive fish kill incident in coastal waters in Rivers State, Nigeria. Primary data were collected using questionnaires from 101 randomly selected fishermen and the data were evaluated using descriptive statistics. The results showed that fishing was the main occupation of the respo...
Microbial load in Sciaenid fishes (Pseudotholithus. typus, P. senegalensis, and P. elongtatus) collected from the coastal waters in Rivers State, Nigeria were compared. Fish samples were purchased from local fishermen and transported in ice packs to the microbiology laboratory. The mean bacterial counts on the skin of the three fish species using n...
Abstract:
This study was carried out to examine modelling the effects of environmental gradients on bloom-forming Cyclotella species. Plankton samples were collected with a 20 µm mesh plankton net. The physicochemical characteristics were determined in situ, and the nutrients were analyzed in the laboratory using the APHA 2012. The highest mean ce...
The study examined aquaculture extension services in Rivers State, Nigeria. A simple random sampling technique was used to select 50 fish farmers, and primary data were collected using a structured questionnaire. Simple statistical techniques such as frequency distribution and percentage were used to analyse the data. This survey revealed that most...
Aquatic macrophytes are crucial within the inland waters of the Niger Delta as they enhance the surrounding, act as a dwelling region for minute water creatures, and make a contribution considerably to fisheries productivity. Aquatic macrophytes also provide substrates, meal, and habitat for aquatic animals, in addition to enhancing habitat physica...
Morphometric and meristic characters of the Arius gigas species were examined from two study areas (New Calabar and Degema Rivers) for a period of six months in Rivers State, Nigeria. Total of 200 individuals, 100 from each study site, were examined and analyzed. A majority of the values for external morphometric parameters of A. gigas were higher...
The Niger Delta is the Nigerian oil and gas province. About 10 – 40% of produced associated gas is underutilized and is flared into the environment. Gas flaring is the burning of natural gas and petroleum hydrocarbons in flare stacks by upstream oil companies in oil fields during operations. Flaring operations have adverse impacts on the environmen...
The length-weight relationship, condition factor, and hepatosomatic index of three of the most abundant and commercially valuable croaker (Sciaenidae) species in the coastal waters of Nigeria were examined following mass fish kills. A total of 489 individuals of Pseudotolithus were sampled, and Pseudotolithus elongatus formed the bulk of the catch,...
ABSTRACT: This study was carried out from December 2021 to November 2022 to examine the interaction of environmental
factors with bloom-forming Coscinodiscus species. Plankton samples were collected with a 20 μm mesh plankton net. The nutrients
were analysed in the laboratory using the APHA 2012 Method, while physico-chemical characteristics were d...
This study was carried out from December 2021 to November 2022 to examine the interaction of environmental factors with bloom-forming Coscinodiscus species. Plankton samples were collected with a 20 µm mesh plankton net. The nutrients were analysed in the laboratory using the APHA 2012 Method, while physico-chemical characteristics were determined...
This study was designed to determine and compare the effects of smoking processes on the proximal composition, fatty acid profile, minerals, vitamins, total polycyclic aromatic hydrocarbons, and sensory characteristics of cultured Clarias gariepinus. Nine fatty acids were identified from the muscle of fish samples, with all nine fatty acids recorde...
Length-weight relationships (LWRs), length-length relationships (LLRs), and condition factor of Pseudotolithus elongatus from the coastal waters of Rivers State, Nigeria, were studied. Specimens were collected from the catches of fishermen using various fishing gear. The dominant length ranged from 20 to 26 cm, with a mean length of 22.65±3.06cm. T...
This study was designed to investigate the socio-economic and profitability of the frozen fish retailing business in Rivers State, Nigeria from March to August 2021. During the study period, a total of 80 frozen fish retailers were selected randomly for this study. Descriptive statistics, budgetary analysis, and multiple regression analysis were us...
Abstract
This study examined the seasonal abundance of harmful Microcystis aeruginosa species in the Central Bonny Estuary between December 2019 and November 2020. Four sampling stations were established with the Arc GIS tool. Microalgal species was sampled with 20µm mesh plankton net to provide a quantitative account of the algal species. The nutr...
This study aimed to investigate the haematological profile of Clarias gariepinus after stress from transportation and handling in the market. C. gariepinus mixed sexes and siblings reared in the same fish tank were subjected to transportation and market stressors associated with transportation and handling in the market. Ten fish were collected at...
The population biology and stock assessment of African moony, Monodactylus sebae was studied based on monthly length frequency data collected from New Calabar River, Nigeria from February 2020 to March 2021. The estimated von Bertalanffy growth parameters were growth performance index (2.91 per year), asymptotic length (L∞ = 36.54 cm) and growth cu...
This study was carried out from December 2018 to November 2019 to examine the distribution and abundance of harmful algal species (HAS) in the central Bonny estuary. Seven sampling stations were established with ArcGIS tool. Microalgae species were sampled with 20 mm mesh plankton net. Nutrients were analyzed in the laboratory using the APHA 4500 M...
This study assessed the growth, mortality and exploitation rate of Sardinella aurita in the New Calabar River. A total of 513 specimens of S. aurita were collected from artisanal fishers and assessed between March 2020 and February 2021.For statistical analysis, FiSAT II software was used. At asymptotic length (L∞) = 21.73 cm, growth rate (K) = 0.9...
A study was conducted to determine and compare the effects of freezing and smoking on the proximate and mineral composition of Sardinella eba. The results of the proximate composition were observed to be higher in the smoked fish samples compared to the frozen samples, with all parameters significantly higher (P<0.05) in the smoked samples than in...
Background and Objectives: Harmful algal species are natural phenomena that have occurred throughout history in water bodies.
Estuaries form an integral part of inshore waters, despite extreme conditions, they are fertile, highly productive and essential
ecosystem. This study examined the seasonal variation and abundance of harmful Bacillaria paxil...
This study assessed the length-frequency distribution and condition factor of Brycinus
nurse from two sampling stations in the New Calabar River. A total of 401 individuals of B.
nurse were collected from artisanal fishers and assessed between February 2020 and
January 2021.The collected samples were analyzed for growth pattern using FISAT II. The...
Length-frequency distributions, length-weight relationships, length-length relationships and condition factors (Fulton’s KF, allometric KA, and relative KR) of Arius gigas in the Obuama Creek in Rivers State, Nigeria were investigated. 217 samples were collected from artisanal fishermen fishing on the Obuama Creek from March to September 2019. The...
This study examined the parameters of the growth, mortality, and exploitation of endangered ladyfish (Elops lacerta) in the Obuama Creek, Rivers State, Nigeria. Fish samples were collected monthly from the local fishermen using various fishing gears (gillnet, cast net and local traps). The samples were identified individually with fish identificati...
This study aims to analyze the cost-benefit of catfish marketing in Obio- Akpor Local Government Area of Rivers State. A random sampling technique was adopted in sampling 60 catfish marketers in 5 catfish markets for the study. Data were collected with a structured questionnaire and were analyzed using descriptive statistics and regression models....
A preliminary survey of harmful algal species in the Bonny Estuary was conducted in the Dry Season (October to December) 2017, to enhance ecosystem-based management strategies for harmful algal blooms; through HAB detection. The experimental approach includes: the deployment of an ACRC GIS tool to select nine geo-reference stations; the collection...
Nigeria has many rivers spread all over the country providing important goods and services to the people, including fisheries. The rivers are also used for several other purposes that require better management of these vast resources to increase fish production. This paper briefly highlights: i) the extent of river systems; ii) potential and produc...
The aim of this study was to analyze fish species caught by gill nets and fish diversity of the New Calabar River. Three sampling stations were set based on the coverage situation of the river and ichthyofauna associated with gill nets were sampled twice monthly from February to July 2018. A total of 3,251 fish specimens, representing 11 orders, 15...
Biometric indices of Pomadasys jubelini from Obuama Creek, Rivers state, Nigeria were investigated using length frequency distributions (LFDs), length-weight relationships (LWRs), length-length relationships (LLRs), condition factors (allometric, KA, Fulton's, KF and relative, KR). Specimens were captured in a stretch of the creek from March to Sep...
Length-weight relationships (LWRs) and condition factor are important biological information to assess the growth pattern and wellbeing of fish species influenced by numerous abiotic and biotic factors. To date, no data on the LWRs and condition of mullets in Sombreior River, Niger Delta. Hence, this research was conducted to determine abundance, l...
This study was conducted to estimate the length-weight relationship and condition factor of mullets (Mugilidae) in the New Calabar River, Nigeria. The fish samples were collected monthly from the local fishermen landings between February and July 2018. A total of 578 individuals were collected that belong to three species (Neochelon falcipinnis Val...
ABSTRACT A survey of algal species in the Bonny Estuary was carried out in seven sampling stations between December, 2017 and May, 2018 to determine the diversity and abundance of harmful centric diatoms in the Bonny Estuary. Plankton samples were collected with 20µm mesh plankton net to provide a quantitative account of harmful algae species, some...
Abstract: The study was conducted to determine the diversity and abundance of mullets (Mugilidae) in the New Calabar River, Nigeria. Fish samples were collected monthly between February to July 2018 at three landing stations: Choba: Station 1, Ogbogoro: Station 2 and Iwofe: Station 3. A total of 578 individuals belonging to three species (Sicklefin...
A study was conducted to estimate the growth and stock characteristics of the Sardinella maderensis (Lowe, 1838) from Sombreiro River of Niger Delta, Nigeria. Results obtained revealed that mean total length and the mean weight of S. maderensis ranged between 4.1cm to 18.5 cm and 5g to 55.5g respectively. The b value of the length-weight relationsh...
The effects of Moringa oleifera leaf meal on the haematological indices and biochemical enzymes of Clarias gariepinus fingerlings was investigated for a period of eight (8) weeks. M. oleifera leaf meal was substituted for fish meal at 0 (control), 10, 20, 30, 40 and 50% in the six different diets. C. gariepinus fingerlings (mean weight 9.17 ± 0.33...
The purpose of this study was to investigate the species composition and size selectivity of gillnets commonly used by the artisanal fishers in the New Calabar River, Rivers State, Nigeria. The data was collected during February-July 2018 from 3 sampling stations: SI Choba, S2 Ogbogoro, and S3 Iwofe all along the stretch of the river. Twenty-eight...
A study on growth pattern, condition factor and stock characteristics of the Sicklefin MulletLiza falcipinnis Valenciennes, 1836 from the New Calabar River, Nigeria was undertaken from January to December 2017. The length of L. falcipinnisranged from 9.1 to 37.1 cm while weight was between 13 to 370 g. The result of length weight relationship revea...
ABSTRACT
The length weight relationship and condition factor (K) of fish species caught by cast net were studied from three stations in the New Calabar River, Rivers State, Nigeria. A total of 1541 specimens of 26 fish species and representing 11 families were randomly collected using cast net with mesh sizes of 1.5 and 2.5 cm. Sample sizes of t...
This study aimed to determine the growth patterns, mortality, and exploitation status of two species of Alestidae in the New Calabar River, Nigeria. For this purpose, fish samples were collected monthly from three landing sites from the local fishermen using gill nets (mesh sizes: 15-25mm), beach seine (mesh sizes: 2.3-10mm), and cast nets (mesh si...
p>A study on the catch composition and diversity of cast net fisheries was conducted between May and August, 2017 in the New Calabar River, Rivers state, using cast net of varying mesh sizes (1.5mm and 2.5mm). Fish samples were collected from three sampling stations, viz. Station1- Aluu, Station 2- Choba and Station 3- Iwofe. The fish species recor...
This study was conducted to study the distribution, abundance and diversity of the cichlids in the New Calabar River, Nigeria. A total of 1073 cichlids belonging to ten species and seven genera (Coptodon guineensis, C. zillii, C. dageti, Pelmatolapia mariae, Hemichromis fasciatus, Pelvicachromis taeniatus, Chomidotilapia guntheri, Tylochromis sudan...
This study was conducted to study the distribution, abundance and diversity of the cichlids in the New Calabar River, Nigeria. A total of 1073 cichlids belonging to ten species and seven genera (Coptodon guineensis, C. zillii, C. dageti, Pelmatolapia mariae, Hemichromis fasciatus, Pelvicachromis taeniatus, Chomidotilapia guntheri, Tylochromis sudan...
This research was carried out to investigate the length-weight relationship and condition factor of Coptodon guineensis from the New Calabar River and Buguma Creek, Nigeria. Assessments of the length and weight parameters indicated that the total length ranged from 12.4 cm to 29.8 cm with a mean value of 17.84±0.40 and the weight varied between 41g...
This research was conducted to study length frequency distribution, length-weight relationship (LWR) and condition factor of 10 cichlid fishes, viz. Coptodon guineensis, Coptodon zillii, Coptodon dageti, Pelmatolapia mariae, Hemichromis fasciatus, Pelvicachromis taeniatus, Chomidotilapia guntheri, Tylochromis sudanensis, Sarotherodon galilaeus and...
Abstract.
Oladosu-Ajayi RN, Omoniyi
IT, Dienye HE
. 2018. Muscle protein bands resolved by Sarotherodon melanotheron from
fresh and brackish water habitats. Nusantara Bioscience 10: 41-46.
An electrophoretic analysis of muscle protein of
Sarotherodon
melanotheron
from freshwater (Eleiyele Reservoir, Ibadan, Nigeria) and brackish water (Lekki L...
This research was conducted to study the morphological characteristics of Coptodon guineensis from brackish and fresh water habitats in Rivers State, Nigeria using morphometric measurements and meristic counts. A total of 200 specimens of Coptodon guineensis, (two groups of 100 each from two study sites) were examined and analyzed for morphometric...
Nigeria
is endowed with extensive inland water bodies that are very rich in fish and
shell fish many of which are of commercial importance. These diverse fish
resources with immense potential plays contributing role to the food security
and improving livelihoods of local fishers, but in recent years, there has been
serious concern about the poor st...
Dienye HE, Olopade OA, 2017. Distribution and abundance of aquatic plants of Oyan Lake, Ogun State, Nigeria. Bonorowo Wetlands 7: 11-15. The distribution and abundance of aquatic plants from Oyan Lake were assessed bi-monthly between October 2012 and January 2013. In total, 20 species of aquatic plants were recorded, representing 13 families. Cyper...
Dienye HE, Olopade OA, 2017. Distribution and abundance of aquatic plants of Oyan Lake, Ogun State, Nigeria. Bonorowo Wetlands 7: 11-15. The distribution and abundance of aquatic plants from Oyan Lake were assessed bi-monthly between October 2012 and January 2013. In total, 20 species of aquatic plants were recorded, representing 13 families. Cyper...
An important goal of fisheries management is to ensure that fish stocks are harvested at sustainable levels of fishing pressure. However, the classical maximum sustainable yield theory and its derivatives have not worked for fisheries management. A number of mitigating measures have been suggested of which eco -labeling is one. An ecolabel on a fis...
Phytochemical screening of the leaves of Ocimum gratissimum and Vernonia amygdalina was revealed the presence of alkaloids, flavonoids, steroid, tannins, and caroternoid. The best solvent of extraction for both plants was the hot water followed by the cold water even though they were unable to liberate flavonoids from bitter leaf extracts. The wash...
The physico-chemical parameters of the upper and lower reach of the New Calabar River across five stations in relation to season were investigated from December 2013 to May 2014.The result showed that the water was slightly acidic across months with pH range of 6.18 to7.08 and across Stations. Relatively high Do levels were observed during the stud...
