"HE BEHAVIOUR AND PHYSlOLOOY OF HERRING A N D OTHER CLUPEIDS 323
of fish for 1 min). Boyar (1961) (also as part of these investigations)
found that captive herring, 6.0-21.9 cm long, in a n annular rotating
trough, maintained a maximum speed for 30 sec of 69-132 cm/sec at
temperatures ranging from 1.4-643"C and 9.5-11-2"C. Boyar dso
measured the endurance of fish of different lengths in different water
velocities. These results are shown in Fig. 12.
Schiirfe (1 960), from echo-sounding records, found that shoals of
herring seemed to be keeping ahead of a trawl moving at 3 knots
(170 cm/sec), and that the best catches were obtained at trawling speeds
of 3-6-44 knots (200-250 cmlsec).
Length (cm)
velocities (re-drawn with permiwnion from Royar, 1 gel).
FIQ. 12. Calculated endurance of herring of differont length in diffwmt, wntnt
I n contrast Stringham (1 924) observed Pomolobw pseudoharengu.4
of unknown length making headway against a current 9f 900 crnlwc,
but not against one of 405 cmlsec. Dow (1962) meamred the spwd of thn
same species, 27.1-31.2 cm long, swimming against & very rapid fhJW of'
water in an artificial sluice. In current vc:locitir?n of 36fJ 4f)(J cm/nr:c:
the maximum speeds ranged from 415-486 cm/Hr:c, for periodrr of 5 - 4
880. These and the results for captive herring are plottttd in Fig. 1.3.
The results are a little difficult to compare as I h W h fish wore riot captive
and wem in faot thcr beet porformers of many others involved in the
experiments, and thc oxtont to which the high current spced may have
influenced them is not known. Cloady tho quostion is raised of how far
the swimming performance of captive fish may be underestimated, and
22
of fish for 1 min). Boyar (1961) (also as part of these investigations)
found that captive herring, 6.0-21.9 cm long, in a n annular rotating
trough, maintained a maximum speed for 30 sec of 69-132 cm/sec at
temperatures ranging from 1.4-643"C and 9.5-11-2"C. Boyar dso
measured the endurance of fish of different lengths in different water
velocities. These results are shown in Fig. 12.
Schiirfe (1 960), from echo-sounding records, found that shoals of
herring seemed to be keeping ahead of a trawl moving at 3 knots
(170 cm/sec), and that the best catches were obtained at trawling speeds
of 3-6-44 knots (200-250 cmlsec).
Length (cm)
velocities (re-drawn with permiwnion from Royar, 1 gel).
FIQ. 12. Calculated endurance of herring of differont length in diffwmt, wntnt
I n contrast Stringham (1 924) observed Pomolobw pseudoharengu.4
of unknown length making headway against a current 9f 900 crnlwc,
but not against one of 405 cmlsec. Dow (1962) meamred the spwd of thn
same species, 27.1-31.2 cm long, swimming against & very rapid fhJW of'
water in an artificial sluice. In current vc:locitir?n of 36fJ 4f)(J cm/nr:c:
the maximum speeds ranged from 415-486 cm/Hr:c, for periodrr of 5 - 4
880. These and the results for captive herring are plottttd in Fig. 1.3.
The results are a little difficult to compare as I h W h fish wore riot captive
and wem in faot thcr beet porformers of many others involved in the
experiments, and thc oxtont to which the high current spced may have
influenced them is not known. Cloady tho quostion is raised of how far
the swimming performance of captive fish may be underestimated, and
22