Olaniyi Alaba Olopade

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• Ph.D in Fisheries management
• Professor at Federal University of Agriculture

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...

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 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...

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,...

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...

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....

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...

Freezing preserves food by stopping the growth and multiplication of microbes or by halting enzymatic activities in foods that would otherwise cause spoilage. This study was conducted to identify and profile the microbes present in frozen fish. Five frozen fish species, Trachurus trachurus, Scombers combrus, Larimichthys crocea, Gadus chalcogrammus...

The study was undertaken to assess the concentration of five heavy metals (zinc (Zn), lead (Pb), copper (Cu), iron (Fe) and manganese (Mn)) in the muscles of Tilapia zilli, Hydrocynus fiscalis, Parapristipoma humile, Caranx hippo, Cynoglossusa caudatus, Chrysichthys nigrodigitatus, Letjanus sp, Portunus validus, Sardinella maderensis, and Sphyreana...

The minimum and maximum standard length of females caught was 8.0cm (14.5g body weight) and 14.6cm (53.4g body weight) respectively while the males were 10.1cm (19.8g) and 17.1cm (68.6g). The gonadosomatic index (GSI) for females ranged between 6.55 and 25.57 while males ranged between 5.68 and 16.55. Significant (P<0.05) relationships were observe...

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...

The study evaluated some population parameters of Galeoides decadactylus in coastal waters of Ghana. A total of 567 samples were collected from some selected coastal communities along the Greater Accra region of Ghana from August 2018 to August 2019. The total length of individual fish samples was measured and analyzed using TropFish R statistical...

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: 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 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...

This research was undertaken to find out the levels of five heavy metals (Cu, Fe, Mn, Pb, and Zn) in the muscles of eight fish species from Epe Lagoon. The levels of heavy metals were determined by atomic absorption spectrophotometry after digestion of the samples using Kjldahl heating digester. The heavy metal concentrations among the fish species...

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 research was conducted to study the morphological characteristics of Coptodon guineensis from brackish and freshwater 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 d...

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...

The concentration of heavy metals in fish is influenced by several factors, in particular, the biological differences (e.g. species, size, age, gender, sexual maturity, diet) and the environmental ones (e.g. water chemistry, salinity, temperature, and levels of contamination) (Carvalho et al. in Anal Bioanal Chem 382:426–432, 2005).

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...

Fish species composition of by-catch in the industrial shrimp trawl fishery in Nigeria was investigated with the Sciaenidae family being the most prevalent by-catch fish species. In order of prevalence Pseudolithus elongatus with a mean weight and length of 15.28g and 86.39mm, respectively and Pseudolithus typus (n= 102) having an average weight of...

Comparative study was conducted to evaluate the growth performances of Tilapia zillii and Sarotherodon galileaus fingerlings caged reared using length-weight (LW) relationship technique. The water quality parameters were also assessed in the cages and outside the cages. The mean value of pH (7.03) inside the cages were slightly higher than outside...

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...

Fish catch composition of some selected small scale fishing gears (gill net, cast net, beach seine and long line) were investigated in Bonny River, Rivers State, Nigeria from August 2014 to January 2015. A total number of 25 fish species from 18 families were recorded during the study. The Mugilidae with only one species constituted the dominant fa...

Fish catch composition of some selected small scale fishing gears (gill net, cast net, beach seine and long line) were investigated in Bonny River, Rivers State, Nigeria from August 2014 to January 2015. A total number of 25 fish species from 18 families were recorded during the study. The Mugilidae with only one species constituted the dominant fa...

The aim of this study was to determine and compare the proximate composition of Oreochromis niloticus and hybrid Tilapia, from Oyan Lake. Parameters proximate composition which includes protein, lipid, ash and moisture content were estimated. The average moisture content for O.niloticus was in range of 81.11 to 81.67% and 80.01 to 80.17% for hybrid...

The aim of this study was to determine and compare proximate composition and mineral content of Oreochromisniloticus from fresh water and brackish water. Fish samples were collected from Bayalsa State (fresh water samples) an Rivers State (Brackish samples) and analyzed for their nutrient compositions. The results of proximate composition of the O....

Leuciscus niloticus samples were obtained from Epe lagoon, Lagos state, Nigeria. The fish samples were designated into pooled, male and female sex respectively. Length-weight relationship was carried out to investigate the correlation value, growth pattern and the condition factor (k) of pooled, male and female Leuciscus niloticus. In this study, t...

This study was conducted to assess the effect of the water quality of Ogun River, on the African catfish Clarias gariepinus haematological indices. Samples of water and C. gariepinus were collected from Ogun River (Station I, Opeji and Station II, Lafenwa) to determine and compare effects of possible differences of water quality on hematological pa...

This study was carried out to determine and compare the proximate composition and length weight relationship of C. gariepinus from two culture systems (earthen and concrete ponds). The fish samples were collected from three fish farms with same cultural condition in different areas of Obio - akpor Local Government Area of Rivers State, Nigeria...

This study aimed to determine and compare proximate composition of three commonly commercial imported frozen fish species in Nigeria (Scromber scrombrus, Trachurus trachurus and Sardinella aurita) with reference to poor handling and size. Major nutrient compositions of raw muscles like protein, fat, moisture, ash were estimated. Fish samples were c...

A study was conducted to determine and compare the proximate composition of Chrysichthys nigrodigitatus and Chrysichthys walkeri from Oyan Lake, Ogun State, Nigeria. Fish samples were collected during the months of February, March and April, 2013 from Oyan Lake and conveyed to the laboratory for analysis. The proximate composition of protein, fat,...

The concentration of heavy metals(Zn, Ni, Pb, Cd and Cu) in the muscle of three fishery organisms (Chrysicththys nigrodigitatus, Sarotherodon galilaeus and Peneaus monodon)and in environmental samples of waterand sediment were tested in Yewa Lagoon, Nigeria. Five fishing villages along the lagoon were selected as the sample sites where these metals...

Samples of Sarotherodon galilaeus were collected from fishermen’s landings at Imala and Ibaro stations in Oyan dam to investigate some aspects of biology of Sarotherodon galilaeus. The samplings were done twice a month from March to August 2012. Numerically the female species was the most abundant catch which accounted for 60% of the total catch of...

This study was carried out to investigate the abundance, distribution, diversity and condition factor of Mormyrids in Oyan Dam lake, Abeokuta North Local Government Area of Ogun State, Nigeria. The fish were sampled from the catches of the fishermen in Oyan Dam lake, which used gillnets of 30-80 mm laterally stretched mesh size. The fish were sampl...

The physicochemical studies were conducted to assess water resources in Abeokuta North Local Government Area, Ogun State in relation to their potential for aquaculture uses. Water samples were collected from both surface and groundwater sources and analyzed for pH, colour, turbidity, conductivity, total hardness, chloride, BOD, carbonate, iron, lea...

Fish deterioration or spoilage is one of the greatest problems facing the fishing industry in Nigeria, and since ancient times, smoking has been used to preserve fish products and improve their taste, aroma and colour. The present study was carried out to determine and compare the effects of traditional smoking kiln on nutritional properties and se...

A study of morphometric and meristic characteristics of Gymnarchus niloticus from Oyan dam in Ogun State and Epe creek, Lagos State used three meristic and ten morphometric measurements in relation to standard length and head length. The body measurements and proportions did not bring out definite demarcation in the morphology of Gymnarchus nilotic...

A study was conducted to examine the factors influencing the sales of fresh fish in Ogun State. Data was collected with the use of structured questionnaires, which was administered in three of the four agricultural zones of Ogun State: Abeokuta, Ijebu-Ode, and Ilaro zones. The results revealed that the respondents were mostly males (79.38%) with hi...

The study was conducted to assess the profitability and socioeconomic factors influencing small scale fish farming activities in Epe Local Government Area of Lagos State. Primary data was generated from 100 fish farmers purposively selected. Data collected were analyzed using descriptive statistics, costreturns analysis and regression analysis. Fin...

The study investigated the catch rate of fishing gears used by artisanal fisherman in Oyan lake. Catches from fishing operations conducted between June to December 2008 was analyzed to determine diversity of fish species captured by gillnet, cast net, hook and line, long line and trap. The results revealed that fourteen fish species belonging to th...

Tunas have been particularly affected by overfishing and several large tunas such as the Southern Bluefin Tuna and the Northern Bluefin Tuna are on the endangered list. Even though these are cold water tunas and are not found within the West African Maritime territory. Those species found within the Atlantic Ocean of West Africa are also being thre...

The objective of the study was to elucidate and analyze key conditions for communal acadja system on the Badagry creek in Ipokia Local Government Area of Ogun State. A sample size of 120 respondents was used for the study. Data were collected with structured questionnaires and analysed with the use of descriptive statistics such as means and percen...

This paper examines the role of Children in Communal Acadja fishing method in Badagry Lagoon, Ogun State. The study covered 60 respondents (children) involved in community based acadja fishing. Data were obtained with the use of structured interview schedule and analyzed with the use of descriptive statistics such as means, percentages and inferent...

A survey of occurrence and abundance of fish species in Yewa Lagoon was conducted between March 2007 and February 2008 using gill nets of various mesh sizes. Results of the study show that a total of 30 species of the fish fauna belonging to 18 families were encountered. Three families namely Cichlidae (27.4%), Bagridae (11.61 %) and polypteridae (...

Gillnet Selectivity and fish composition was studied in Ere fishing channel,Ado-odo/Ota, Ogun State, Nigeria between January to September, 2007. The study aimed at improvement of fishing gear for exclusion of both undersized fishes and by catch for the purpose of management conservation of the channel. The study was carried out using gillnet fleet...

A limnological study to determine the water quality of Oyan Lake, Ogun State, Nigeria was carried out between April 2007 and March 2008 at the dam site. Standard methods were used to monitor the physico-chemical parameters. The physico-chemical parameters investigated are water temperature, pH, alkalinity, conductivity (physical), hardness, dissolv...

Olopade OA, Rufai OP. 2014. Composition, abundance and diversity of the Family Cichlidae in Oyan Dam, Ogun State, Nigeria. Biodiversitas 15: 195-199.This study was conducted to determine status of the family Cichlidae in Oyan Dam, Nigeria, during the wet and dry seasons of 2011. Samples were collected using multi-mesh gillnets ranging between 30 mm...