Skip to main content

The Population Dynamics of the Mudskipper, Periophthalmus barbarus (LINNEAUS 1766) (TELEOSTEI, GOBIIDAE) and the Implication for Conservation and Management in the Mangrove Swamp of Iko River Estuary, Southeastern Nigeria | Chapter 05 | Recent Advances in Biological Research Vol. 3

The population dynamics of Periophthalmus barbarus in the mangrove swamp of Iko River estuary, southeast of Nigeria were obtained from a twenty four month length composition data ranging 4.6 – 14.5 cm total length (TL) (mean 9.1841± 1.6346: n = 2,876) corresponding to 1.16 – 50.6 g total weight (TW) (mean = 9.9626 ± 5.4796) the growth was exponential. The asymptotic length (L∞) of the Powell-Wetheral plot (L∞ = 15.03 cm) was seeded into FSAT II (FAO-ICLARM Stock Assessment Tools II) software to obtain best estimates of von Bertalanfy growth parameters as L∞ = 16.22 cm TL, growth coefficient (K) = 1.2 year-1, age of fish at zero length, to = 0.071, longevity, tmax = 2.5 years. The estimated growth performance index, φ' = 2.449. Other FISAT II growth parameters were the amplitude of growth oscillation, C = 0.6 and the winter point, WP = 0.6, Rn = 0.3127. Mortality parameters were total mortality, Z = 479 year-1, natural mortality, M = 2.39 year-1 and fishing mortality, F was 2.40 year-1. Result indicate the fishery is optimally exploited with current exploitation rate, Ecur = 0.50 < Emax = 0.668 > Eopt = 0.5 which suggests stock optimal exploitation, corroborated by Z/K ration (3.184).  Ecur (0.5) means that 50% of the available stock is being fished annually. The length-at-first capture Lc = 7.33 cm TL and Lc/L∞ was 0.45, indicating the fish was yet to complete 55% of growth as at the time of capture at Lc, hence P. barbarus in the ecosystem is at the optimal level of exploitation as well as the presence of growth overexploitation. Thus to circumvent the consequences of growth overfishing, sustainable fisheries measures such as monitoring of fishing effort, use of selective gears and increase in mesh size should be encouraged, implemented and enforced. The study has revealed that P. barbarus population residing in the mangrove swamp of Iko River Estuary is experiencing exploitation rate close to the maximum sustainable yield amidst the presence of heavy fishing pressure. Moreover, the mudskipper fishery in this ecosystem is currently exhibiting growth overexploitation signs which could lead to severe implications on the population size and food security within vulnerable fishing households in the future. Therefore, urgent management interventions in the form of monitoring fishing efforts, return of captured juveniles back to the water body from the non-selective fishing gear and use of selective gear with large mesh size (to increase length at first capture) are needed to safeguard this important fish species from possible collapse in the future.

Author  Details:

Dr. Nsikak Abiaobo
Department of Zoology, Akwa Ibom State University, Ikot Akpaden, Mkpat Enin, P.M.B. 1167, Akwa Ibom State, Nigeria.

Dr. Mfom Tmothy Udo
Department of Fisheries and Aquatic Environment Management, University of Uyo, P.M.B. 1017, Akwa Ibom State, Nigeria.


Popular posts from this blog

Empowerment and Leader Member Exchange towards Organizational Citizenship Behavior Readiness among Government Workforce in Malaysia | Book Publisher International

  State agencies are among the most significant entities that represent the public's needs, and their programmes are essential to a state's and the nation's economic growth and development. State agencies have been rife by public concerns for years, as demonstrated by the Public Complaints Bureau, as problems of inefficiency in service quality and delivery have yet to meet the public's standards. With the support of 15 employees from state agencies on Malaysia's east coast, this study aims to achieve three targets. The first and second objectives are to investigate the ties between leader-member exchange (LMX) and OCB empowerment. The final aim is to define the most significant factors that affect OCB willingness. A total of 288 people took part in the survey, which was conducted using a cluster sampling process. The survey items had achieved the necessary reliability, according to the pilot test results, and some sub-dimensions were renamed after factor analysis.

Re-asserting Cultural Perspectives: Old People and New Ideas in Bole Butake’s Lake God and The Survivors and Sankie Maimo’s Succession in Sarkov | Chapter 10 | Perspectives of Arts and Social Studies Vol. 2

African cultures have undergone transformations from the colonial period to the present, often to the detriment of its cultural evolution and within the larger global community. As it were, colonial education subordinated African communalism and created in its place an anti-African spirit evident in the assimilation of western values. This did not only end up in a kind of cultural betrayal, but also posed as a serious threat to the dignity and identity of the people. Those who fall prey to this kind of cultural imperialism are the young people who are often irrationally carried away by western fashion and modes that they tend to neglect and/or forget their cultural ways of life as they join the race of “progress.” This situation has given rise to a conscious effort by creative writers to re-assert and protect African values while at the same time liberating themselves from the longstanding western effort at suppressing, controlling and dominating their thoughts particularly through n

The Utilization of Agro-Waste: A Nanobiotechnology Point of View | Chapter 10 | Recent Advances in Biological Research Vol. 5

Aims: To review the utilization of agro-waste in the eco-friendly synthesis of nanoparticles and their biomedical, catalytic and industrial applications. Study Design: A review. Place and Duration of Study: This review was carried out in the interim of three weeks exploiting all relevant data, literature and publications where necessary. Methodology: Profound gathering of literatures/publications and reviews were employed with all carefulness and professional courtesy; enough useful information were gathered over time. The introduction emphasizes the dawn of science and technology, when great ideas were still latent later leading to the advent of history changing innovations like the completion of human genome and then the birth of nanotechnology. Although, nanotechnology had been known decades been popularized by Richard Feynman in his talks in the year 1959; and in this present dispensation, nanotechnology has been a solution to many intricate challenges/ t