Abundance and gill net selectivity of Pellonula leonensis in the Lower Nun River, Niger Delta, Nigeria

Kingdom, T.; Allison, M E

doi:10.5897/ajb2007.000-2380

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…While relative fecundity was determined as the proportion of absolute fecundity to the eviscerated body weight (number of mature eggs per gram of the body weight) (Kingdom & Allison, ).…”

Section: Methodsmentioning

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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“…While relative fecundity was determined as the proportion of absolute fecundity to the eviscerated body weight (number of mature eggs per gram of the body weight) (Kingdom & Allison, ).…”

Section: Methodsmentioning

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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“…Evidences exist that in the Lagos lagoon, gill net is the dominant fishing gear used in the water body (Kingdom and Allison, 2007). Emmanuel et al (2008) observed size selection of gill nets as being crucial to fisheries management to maximize sustainable yields.…”

Section: Introductionmentioning

confidence: 99%

Gillnet Selectivity and Abundance of African Butter Catfish Schilbe mystus (Linnaeus, 1758 ) in Lower River Ogun, Nigeria

Adeosun¹

2019

Egypt. J. of Aquatic Biolo. and Fish.

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Sampling Gear Efficiency and Selectivity for Juvenile Ladyfish Elops Saurus in Florida Waters (USA)

Levesque¹

2013

Wildl. Biol. Pract.

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At the foundation of managing wildlife is collecting accurate field data with appropriate sampling gears and methods under a strict experimental design and standardized protocols. To elucidate, monitor, and predict wildlife patterns in space and time requires the selection of specific sampling gears for the community or species of interest, especially for species that display spatial and temporal variability in distribution and abundance. Among the most challenging types of wildlife to examine in the field are marine fisheries resources given their expansive range, spatial and temporal distribution, and specific early life-history characteristics (e.g., habitat, environmental conditions, and recruitment patterns). Numerous studies have investigated the catch efficiency for various sampling gears and techniques; however, no information has ever been reported for ladyfish (Elops saurus), an economically valuable species in the southeastern United States and other world-wide regions. Given the importance of collecting ladyfish early life-history information, the purpose of this investigation was to evaluate, for the first time, the efficiency and selectivity of various field-sampling gears used in Florida waters to collect juvenile ladyfish. The specific objectives were to examine the sampling gear efficiency and selectivity on juvenile ladyfish relative abundance and length-frequency distribution among different water bodies. This investigation found that juvenile ladyfish abundance, size, and length frequency distribution significantly varied by sampling gear. In addition, the findings revealed that the most efficient gear for sampling juvenile ladyfish smaller than 100 mm SL were seines with an offshore deployment method. Despite detecting length frequency differences among sampling gears, no clear pattern was evident among estuaries. In general, seine catch efficiency decreased and gillnet efficiency increased with ladyfish size. To alleviate gear or sampling bias, results demonstrated that researchers need to use a variety of sampling gears to sample ladyfish

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Abundance and gill net selectivity of Pellonula leonensis in the Lower Nun River, Niger Delta, Nigeria

Cited by 4 publications

References 7 publications

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

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

Gillnet Selectivity and Abundance of African Butter Catfish Schilbe mystus (Linnaeus, 1758 ) in Lower River Ogun, Nigeria

Sampling Gear Efficiency and Selectivity for Juvenile Ladyfish Elops Saurus in Florida Waters (USA)

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