The Recruitment Pattern of Liza falcipinnis from Elechi creek of
Upper Bonny, Niger Delta, Nigeria was studied from (March 2009-January 2010). The pattern showed all year round recruitment
with two peaks (one major and one minor) during the period of the study. The
parameters obtained were L∞ = 19.96, K = 0.40 y﹣1, C =
0, WP = 0, to = 0. The C indicates the amplitude of seasonal growth
oscillations (that is, the magnitude of the growth patterns) and has values
ranging from 0 to 1.0. Winter Point (WP) indicates the times of the year during
which growth is minimal. The percentage recruitment for the different months were:
March 2009 (15.0%); April (23.40%); May (14.0%); June (11.3%); July (10.0%);
August (7.30%); September (1.8%); October (0.5%); November (2.2%); December
(8.0%) and January 2010 (6.0%). The exploitation rate (Emax) that
gives maximum relative yield-per-recruit was 0.424. The exploitation rate at
which marginal increase occurred in the relative yield-per-yield was 10% of its
value at E = 0, whereas (E0.1) was observed to be 0.357. The exploitation
rate (E0.5) which corresponds to 50% of the virgin (that is, the
unexploited stock) relative biomass-per-recruit was estimated to be 0.279. The
mean ratio of length-at-first capture (L∞) and asymptotic length (L∞)
was 0.060, while that of natural mortality (yr﹣1) and growth rate (yr﹣1) was 1.00. Yield per increased gradually with
increase in exploitation and Biomass per recruit declined with increase in
exploitation. An all year round recruitment, with one high pulse arid a low
pulse was established for the species. Research should be carried out to
ascertain the influence of environmental factors on the growth and recruitment
of the species.
Cite this paper
George, A. D. I. and Abowei, J. F. N. (2018). The Recruitment Pattern of Liza falcipinnis from Elechi Creek, Upper Bonny, Niger Delta, Nigeria. Open Access Library Journal, 5, e4457. doi: http://dx.doi.org/10.4236/oalib.1104457.
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