Changes in the population structure and life history associated with long-term intense fishing of the Argentinian croaker Umbrina canosai in southern Brazil

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Table 5

Percentages of females in 30 mm TL interval classes and age of Umbrina canosai in the landings of commercial fishing along Southern Brazil landed in 1976-1984 and 2011-2018. χ² and P(χ2, 95%) are the scores of 2 × 2 contingency tables to test the differences between periods and the corresponding 95% probabilities. *indicate significant differences.

		1976-1984		2011-2019

Parameters		n	%	n	%	χ2	p(χ2)
Age	1	914	0.61	301	0.39	15.83466	< 0.01*
	2	1607	0.51	270	0.40	2.926637	0.087
	3	1886	0.56	291	0.43	4.154572	0.041*
	4	1277	0.66	225	0.52	3.893351	0.048*
	5	825	0.69	146	0.45	7.818268	< 0.01*
	6	591	0.70	96	0.58	1.342162	0.247
	7	427	0.64	71	0.59	0.177175	0.674
	8	312	0.71	63	0.67	0.121449	0.727
	9	219	0.76	45	0.73	0.049091	0.825
	10	175	0.73	34	0.71	0.015214	0.901
	>11	506	0.63	84	0.73	0.731458	0.392
Total Lenght	180	653	0.53	57	0.46	1.142297	0.285
	210	1062	0.49	275	0.40	6.20483	< 0.01*
	240	1827	0.44	252	0.37	4.416351	0.035*
	270	2265	0.45	217	0.42	0.520261	0.47
	300	2270	0.55	261	0.41	16.61109	< 0.01*
	330	1785	0.64	309	0.58	17.48223	< 0.01*
	360	562	0.73	281	0.60	17.48226	< 0.01*
	> 390	77	0.82	231	0.71	3.745018	0.052

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