Length-weight relationships of fish from sandy beaches

Olentino, D.; Lubich, C. C. F.; Rocha, M. D. P.; Santos, J. H. N.; Gomes, T.; Beltrão, H.; Silva, J. F.; Yamamoto, K. C.

doi:10.1590/1519-6984.250003

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Brazilian Journal of Biology

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Original Article • Braz. J. Biol. 83 • 2023 • https://doi.org/10.1590/1519-6984.250003 copy

Length-weight relationships of fish from sandy beaches

Relação peso-comprimento de 16 espécies de peixes que ocorrem perto de praias arenosas ao longo da bacia do baixo rio Negro na Amazônia brasileira

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This study estimated the length–weight relationships of 16 fish species occurring close to the shores of sandy beaches along the lower Negro River basin, Brazilian Amazon. The specimens were captured for one day each month, in October to November 2016, early in the morning and early evening, using trawl net (20 m taken for standard length (SL – 0.1 cm precision) and total weight (TW – 0.01 g precision). The parameters a and b of the equation WT = a.LT^b were estimated. The a values ranged from 0.0018 to 0.0226 and b values ranged from 2.5271 to 3.3244. This study also provides new data on of maximum lengths for six species, Amazonsprattus scintilla, Brycon pesu, Moenkhausia megalops, Pachyurus paucirastrus, Reganella depressa and Trachydoras microstomus, and new reports of the LWRs parameters of 15 fish species.

Keywords:
ichthyofauna; sandy beach; allometric coefficient; allometry

Order \| Family \| Species	N	Standard Length (cm)		Total Weight (g)		LWR parameters
Order \| Family \| Species	N	Min.	Max.	Min.	Max.	a (95% CL)	b (95% CL)	r²
Clupeiformes
Engraulidae
Amazonsprattus scintilla Roberts, 1984	590	1.3	2.3 ^a a New maximum standard length;	0.01	0.1	0.0065 (0.0058 – 0.0072)	3.1376 (2.9917 – 3.2835)	0.9775
Anchoviella carrikeri Fowler, 1940	261	3.4	4.6	0.32	0.83	0.0078 (0.0070 – 0.0087)	3.0275 (2.9479 – 3.1070)	0.9946
Anchoviella juruasanga Loeb, 2012	28	1.7	4.2	0.07	4.2	0.0194 (0.0166 – 0.0223)^c c Value above 95% confidence limits of the Bayesian prediction;	2.5271 (2.4221 – 2.6321)^d	0.9998
Characiformes
Bryconidae
Brycon pesu Müller & Troschel, 1845	44	1.4	13.9 ^a	0.05	13.9	0.0189 (0.0165 – 0.0213)	3.0225 (2.9708 – 3.0743)	0.9993
Characidae
Moenkhausia megalops Eigenmann, 1907	306	1.8	5.4 ^a	0.1	4.69	0.0171 (0.0161 – 0.0181)	3.3244 (3.2789 – 3.3698) ^c c Value above 95% confidence limits of the Bayesian prediction;	0.9889
Moenkhausia gracilima Eigenmann, 1908	272	2.8	3.9	0.3	3.9	0.0204 (0.0158 – 0.0250)	2.8083 (2.6259 – 2.9908) ^d d Value below 95% confidence limits of the Bayesian prediction.	0.9512
Microschemobrycon melanotus Eigenmann, 1912	114	1.7	3.1	0.1	0.5	0.0140 (0.1131 – 0.0167)	3.1614 (2.9577 – 3.3651)	0.9739
Moenkhausia cotinho Eigenmann, 1908	40	2.8	4.0	0.4	1.3	0.0154 (0.0104 – 0.0204)	3.1936 (2.9460 – 3.4412)	0.9970
Microschemobrycon casiquiare Böhlke 1953	133	1.9	2.6	0.1	0.3	0.0141 (0.0118 – 0.0164)	3.1802 (2.9844 – 3.3760)	0.9794
Gymnotiformes
Sternopygidae
Eigenmannia macrops Boulenger, 1897^b	346	4.6	11.5	0.4	4.4	0.0072 (0.0068 – 0.0077)	2.6212 (2.5923 – 2.6500) ^d	0.9972
Hypopomidae
Steatogenys elegans Steindachner, 1880^b	23	7.0	14.5	1.2	12.0	0.0033 (0.0029 – 0.0037)	3.0609 (3.0100 – 3.1119)	0.9997
Siluriformes
Loricariidae
Reganella depressa Kner, 1853	11	1.7	14.5 ^a	0.02	18.4	0.0018 (0.0011 – 0.0025)	3.2748 (3.1372 – 3.4124)	0.9994
Auchenipteridae
Ageneiosus uranophthalmus Ribeiro & Rapp Py-Daniel, 2010^b	49	4.0	8.9	0.7	6.86	0.0108 (0.0092 – 0.0125)	2.9424 (2.8665 – 3.0183)	0.9990
Doradidae
Trachydoras microstomus Eigenmann, 1912	300	1.9	6.7 ^a	0.2	7.1	0.0191 (0.0180 – 0.0203)	3.0807 (3.0436 – 3.1179)	0.9886
Perciformes
Sciaenidae
Pachyurus paucirastrus Aguilera, 1983	130	1.3	15.0 ^a	0.02	63.0	0.0117 (0.0090 – 0.0143)	3.1646 (3.0777 – 3.2515)	0.9898
Cichliformes
Cichlidae
Apistogramma pulchra Kullander, 1980	30	1.5	3.0	0.08	0.7	0.0220 (0.0177 – 0.0262)	3.2431 (3.0315 – 3.4547)	0.9935

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