Bulletin of the Sea Fisheries Institute 2 (153) 2001 - CEEMaR

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18 JONATHAN A. HARE et al. larvae were also < 5 mm indicating recent spawning, but abundances were greater in May than November/December (Table 1). ew Scomberomorus cavalla were collected: three in May 1988 and one in November/December; all were
Larval scombrids in the northern Caribbean 19 Average and Standard Deviation of Depth (m) St. Croix Katsuwonus pelamis Local Time 900 1400 1900 2400 900 1400 1900 2400 900 1400 1900 2400 0 0 Puerto Rico 20 20 40 60 80 0 20 40 Thunnus atlanticus Scombrolabrax heterolepis Euthynnus alletteratus 60 60 60 Auxis spp. 80 80 80 900 1400 1900 2400 900 1400 1900 2400 20 21 22 23 Puerto Rico St. Croix Temperature ( o C) Salinity (top axes) 40 60 80 34.5 35.0 35.5 36.0 36.5 37.0 0 0 20 20 40 Salinity Temperature 40 Depth (m) Fig. 3. Average depth (and standard deviation) of larval scombrids caught at different times off of Puerto Rico and St. Croix from May 1984 MOCNESS collections. layer. North of St. Croix, the upper mixed layer extended to 60 m with a slight decrease in salinity (0.2 psu) at 30 m and a slight decrease in temperature (0.2 o C) at 40 m. Again, most of the scombrid larvae occurred in the upper mixed layer, but day/night differences were not as evident in vertical distributions. Relations between larval length and depth distribution varied among species (igure 4). Variability in the distribution of T. atlanticus larvae increased with length of larvae. Smaller (2.0-3.9 mm) T. atlanticus larvae were collected predominantly in the upper 30 m of the water column, while larger larvae (>3.9 mm) were collected as deep at 60-80 m. Similarly, larger Auxis larvae were collected deeper in the water column. In contrast, depth of capture and larval length of Euthynnus alletteratus, Katsuwonus pelamis and Scombrolabrax heterolepis were not related to depth of capture. Horizontal Distribution – November-December 1988 Thunnus atlanticus, Katsuwonus pelamis and Scombrolabrax heterolepis larvae were relatively common (Table 1) and widespread (igure 5-7) in November/December 1988. Concentrations of K. pelamis and S. heterolepis were not significantly different among regions, but there was a tendency for fewer K. pelamis larvae southeast of Puerto Rico (igure 8). T. atlanticus larvae, however, were significantly more abundant south of St Croix compared to south of Puerto Rico and east of Isla de Vieques. Regional differences in length distributions mirrored differences in larval concentrations (igure 9). Length distributions of Katsuwonus pelamis and Scombrolabrax heterolepis
Page 1 and 2: ISSN 1429-2335 Bulletin of the Sea
Page 3 and 4: BULLETIN OF THE SEA FISHERIES INSTI
Page 5 and 6: Growth of Vistula sea trout (Salmo
Page 13 and 14: BULLETIN O THE SEA ISHERIES INSTITU
Page 15 and 16: Larval scombrids in the northern Ca
Page 17: Larval scombrids in the northern Ca
Page 31 and 32: 32 S£AWOMIRA GROMISZ AND ZBIGNIEW
Page 35 and 36: Table 1. Taxa which comprised the l
Page 51 and 52: BULLETIN OF THE SEA FISHERIES INSTI
Page 53 and 54: Energy budget in early stages of sm
Page 61 and 62: 64 KATARZYNA HORBOWA In the Vistula
Page 63 and 64: Table 3. Frequency of occurrence (%
Page 65 and 66: 68 KATARZYNA HORBOWA Bryliñska, M.
Page 67: WSKAZÓWKI DLA AUTORÓW INFORMACJE

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