Preliminary evaluation of some aspects of the ecology (growth pattern, condition factor and reproductive biology) of African pike, Hepsetus odoe (Bloch 1794), in Lake Eleiyele, Ibadan, Nigeria

Ogunola, Oluniyi Solomon; Onada, Olawale Ahmed; Falaye, Augustine Eyiwunmi

doi:10.1186/s41240-018-0087-y

Cited by 27 publications

(23 citation statements)

References 77 publications

(86 reference statements)

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“…According to Beverton and Holt (1957), the departure of the 'b' value from three is rare in adult fishes. In our case, observed variation in the 'b' value could be attributed to several factors such as length range used, season, stomach fullness, gonadal maturity, diet, sampling gear, mesh size, fishing pressure, and presence or absence of disease and parasite (Froese, 2006;Ogunola et al, 2018). However, these factors were not considered in the present study, and thus the observed variations in LWRs parameters could be due to the effect of a single factor or synergistic effect of multiple factors.…”

Section: Discussionmentioning

confidence: 64%

“…Positive allometric growth represents that higher increment in weight as compared to length (fish becomes stouter or heavier or deeper-bodied). Negative allometric growth represents a higher increment in length as compared to weight (fish becomes slender or lighter) (Ogunola, Onada, & Falaye, 2018;Wootton, 1998). Length-weight analysis of pooled (male + female) data suggested the fish exhibited significantly higher exponents (b = 3.336) than expected under isometry (b = 3), indicating the growth of P. khavalchor in the Panchaganga River was positive allometric.…”

Section: Discussionmentioning

confidence: 98%

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Assessing the sustainability of lepidophagous catfish, Pachypterus khavalchor (Kulkarni, 1952), from a tropical river Panchaganga, Maharashtra, India

Gosavi¹,

Kharat²,

Kumkar³

et al. 2019

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Background: The Western Ghats of India, one of the global biodiversity hotspots and freshwater eco-regions, harbors several fish species which not just form the important part of the world's freshwater biodiversity yet in addition are the vital segment of livelihood of the neighborhood population. The rate of fish decline in the Western Ghats is alarming. The absence of organized study and data scarcity on basic biology and life history traits of several species could be one reason behind the decline, and thus it is difficult to execute conservation action/s. This is especially true, particularly for data-deficient species for which definite data related to distribution, population size, and trend is not available. The present study deals with the detailed investigation of population dynamics of catfish species, Pachypterus khavalchor, which is data-deficient species inhabiting the Western Ghats of India and forms an important component of freshwater inland fishery, providing nutritional and financial security to the local community. Methods: Specimens for the present study were collected monthly for a period of 1 year from the River Panchaganga and length-frequency data were analyzed using FiSAT II software. Results: Length-weight analysis of pooled (male + female) data suggested the fish exhibited higher exponent than expected under isometry, indicating the positive allometric growth of P. khavalchor in the Panchaganga River. The asymptotic length (L∞) and the growth rate (K) were estimated as 149.63 mm and 0.71 year −1 respectively. Potential longevity (t max ) and length at first capture (Lc) were estimated as 4.22 years and 73 mm respectively. The total (Z), natural (M), and fishing mortality (F) were estimated as 2.23 year −1 , 0.88 year −1 , and 1.35 year −1 respectively. The current exploitation rate (E cur = 0.60) was found to be almost 90% that gives the maximum relative yield per recruit (E max = 0.67). Recruitment pattern revealed two peaks, suggesting the fish have two spawning bouts each year. Conclusions: The stock of P. khavalchor in the Panchaganga River may be in near full exploitation under the current harvesting strategy, with a high chance of recruitment failure in the future. Additional studies on the reproductive biology of P. khavalchor would be particularly welcome for the imposition of the seasonal closure for effective conservation of stock.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 98%

Assessing the sustainability of lepidophagous catfish, Pachypterus khavalchor (Kulkarni, 1952), from a tropical river Panchaganga, Maharashtra, India

Gosavi¹,

Kharat²,

Kumkar³

et al. 2019

JoBAZ

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show abstract

“…Observed variation in the “ b ” value of fishes could be attributed to several factors such as sampling site, season, sex, gonadal maturity, stomach fullness, diet, length range used, sampling gear, mesh size, frequency of sampling, fishing pressure (Froese, ; Ogunola et al, ; Pise et al, ) which were not considered in the present study. Fish with ideal growth shows the coefficient of determination ( R 2 ) between 0.90 and <1 (Hanif, Siddik, Chaklader, Pham, & Kleindienst, ).…”

Section: Discussionmentioning

confidence: 91%

“…Nevertheless, for majority of the freshwater fishes inhabiting the Western Ghats of India length–weight relationships (LWRs) data are still lacking. LWRs data of the fishes have several applications such as indirect estimation of body weight based on the body length, calculation of condition indices, and also for comparisons of species’ growth trajectories (Chen et al, ; Froese, ; Ogunola, Onada, & Falaye, ). Therefore, the present study was conducted in order to determine LWRs for nine freshwater fish species collected from six different rivers in the Western Ghats of India, so as to provide the basic data on species that are helpful in further detailed fisheries and fish biology studies.…”

Section: Introductionmentioning

confidence: 99%

Length-weight relationships of nine freshwater fishes from six rivers of the Western Ghats of India

et al. 2019

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Length–weight relationships (LWRs) were estimated for nine freshwater fish species collected three times using a scoop net (mesh size 0.3–0.5 cm), cast net (mesh size 1–1.5 cm) and gillnet (mesh size 2.5–4.5 cm) from six rivers of the Western Ghats of India during August 2017–October 2018. The b values for LWRs varied from 2.862 to 3.656 (R2 > 0.916 and p < 0.0001 for all species).

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“…Reproduction plays a vital role in understanding the ecology of different animals including fish (Ogunola, Onada, & Falaye, ). Survival of any of these species in various seasonally changing environments depends on the development of mechanisms that permit it to adjust physiological functions to changes in that environment (Adriaenssens, Damme, Seebacher, & Wilson, ).…”

Section: Introductionmentioning

confidence: 99%

Cyclic variations of gonad development of snow trout, Schizopyge niger from the river Jhelum of Kashmir Himalaya

et al. 2019

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The aim of the present study was to know the cyclic changes in gonadal maturation and to investigate the various developmental stages of oocytes and testicular germ cells of snow trout, Schizopyge niger. A total of 316 fish specimens were procured from three sites of river Jhelum during November 2016 to October 2017 and the histological analysis of their gonad was carried out. The results of the present study indicates that the male population was found significantly (p < 0.05) higher compared to female population and were reported as (1.6:1; M:F). The highest mean GSI value was recorded in male (12.24 ± 0.89) during the month of March and for female (13.74 ± 0.92) also in the month of March, which indicated that the gonadal development reached its peak during this month. The highest mean oocyte diameter was 1.04 ± 0.20 mm observed in March, showing that the oocyte reached its maturity during this month. Histological study of ovary revealed the evidence of vitellogenic yolk granule stage and ripe mature stage from December to April. While in case of male, four stages of spermatogenesis were distinguished and spermatozoa were highly abundant in the months of March and April. Mean ± SE of absolute fecundity was 3,224 ± 421 eggs and also, the relative fecundity was 69 egg/g body weight. Based on the results of GSI and the analysis of gonad histology, it was observed that the peak breeding season of S. niger occurred in the month of March. It was also noted that spawning period of this fish begins in the month of February and lasts till April with a peak breeding season in the month of March. The present study will provide a baseline information about the appropriate peak breeding of the fish, which will be useful for artificial breeding as well for prevention of fishing from natural habitat.

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Preliminary evaluation of some aspects of the ecology (growth pattern, condition factor and reproductive biology) of African pike, Hepsetus odoe (Bloch 1794), in Lake Eleiyele, Ibadan, Nigeria

Cited by 27 publications

References 77 publications

Assessing the sustainability of lepidophagous catfish, Pachypterus khavalchor (Kulkarni, 1952), from a tropical river Panchaganga, Maharashtra, India

Assessing the sustainability of lepidophagous catfish, Pachypterus khavalchor (Kulkarni, 1952), from a tropical river Panchaganga, Maharashtra, India

Length-weight relationships of nine freshwater fishes from six rivers of the Western Ghats of India

Cyclic variations of gonad development of snow trout, Schizopyge niger from the river Jhelum of Kashmir Himalaya

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