Comparisons of day-time and night-time hydroacoustic surveys in temperate lakes

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Table 2

Hydroacoustic survey results. Estimated mean SA, mean TS, and biomass from day-time and night-time surveys by lake and depth layer.

	Mean TS (dB)				SA (m².ha⁻¹)

Lake	Upper layer		Lower layer		Upper layer		Lower layer		Upper layer		Lower layer
	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night	Day	Night
Aiguebelette	–36.95	–40.31	–36.58	–37.79	0.20	0.59	0.33	0.56	7.35	13.59	12.29	18.12
Annecy	–37.75	–47.18	–35.75	–36.03	0.56	0.73	0.65	1.17	18.15	6.81	27.24	47.55
Bouchet	–40.00	–40.43	–35.04	–33.91	0.38	0.20	0.01	0.01	9.14	4.65	0.23	0.75
Bourget	–40.23	–45.35	–37.49	–37.29	1.09	2.73	1.07	0.84	25.48	32.65	35.89	28.93
Issarles	–38.87	–35.87	–38.47	–38.22	0.04	0.02	0.02	0.01	1.20	0.79	0.44	0.37
Montriond	–57.44	–53.36	–42.7	–43.99	0.01	0.00	0.01	0.05	0.03	0.02	0.19	0.66
Pavin	–37.69	–46.85	–37.77	–38.74	0.25	0.00	0.38	0.74	8.01	0.04	12.29	21.15
Brienz	–48.24	–42.4	–43.51	–43.11	0.28	0.22	0.03	0.03	2.29	3.89	0.52	0.51
Lugano	–39.28	–45.89	–44.61	–42.77	0.11	0.11	0.08	0.03	2.84	1.23	1.05	0.47
Morat	–45.03	–43.39	–48.31	–45.03	0.39	0.23	0.02	0.01	4.91	3.57	0.12	0.17
Neufchatel	–36.15	–46.29	–35.2	–37.58	1.56	2.25	0.35	0.54	62.28	23.76	15.82	17.73
Poschiavo	–37.83	–39.79	–35.99	–40.51	0.28	0.04	0.11	0.12	8.85	0.89	4.62	2.80
Thoune	–34.76	–40.51	–37.74	–37.75	0.12	0.09	0.19	0.34	5.71	2.03	6.26	11.09
Zoug	–39.78	–47.09	–39.69	–38.81	0.84	1.14	0.08	0.15	20.95	10.85	1.98	4.20

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