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Biological and Fisheries Data on Scup, Stenotomus Chrysops

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Biological and Fisheries Data on Scup, Stenotomus Chrysops BIOLOGICAL ~ FISHERIES DATA ON SCUP, Stenotomus chrysops (Linnaeus) JANUARY 1978 Biological and Fisheries Data on scup, Stenotomus chrysops (Linnaeus) by Wallace W. Morse Sandy Hook Laboratory Northeast Fisheries Center National Marine Fisheries Service National Oceanic and Atmospheric Administration U. S. Department of Commerce Highlands, N. J. Technical Series Report No. 12 January 1978 CONTENTS PAGE 1. IDENTITY 1.1 Nomenclature........ ........ ............. .... ..... ....... ...... 1 1.1.1 Valid Name.............................................. 1 1.1. 2 Subj e cti ve Synonymy..................................... 1 1. 2 Taxonomy •...•..........•...................•..•...•.•....•..... 1 1.2.1 Affinities •....................•••.•............•....•... 1 1.2.2 Taxonomic Status .•.....•.•...............•......•....... 2 1.2.3 Subspecies •.•..............•.........•....•.•......•.... 2 1. 2.4 Standard Common Names, Vernacular Names ................• 2 1.3 MOrphology................ • . • . • . .. 3 1.3.1 External Morphology.... ......... ... ••. ..... .... .•. .•.•.. 3 1. 3. 2 Cytomorphology.... • .. .. • . •. 3 2. DISTRIBUTION 2.1 Total Area.. ..•... .. ...•... .. ...•.............. ...........•.... 5 2.2 Differential Distribution...................................... 5 2.2.1 Spawn, Larvae and Juveniles.. • . • . 5 2.2.2 Adults... •........•.... .•...•....... ...... ...... .... .... 6 2.3 Determinants of Distribution Changes........................... 6 2.4 Hybridization. • . • • • • . • • . • . • . 7 3. BIONOMICS AND LIFE HISTORY 3 .1 Reproduction. • . • . 7 3.1.1 Sexuality............................................... 7 3.1.2 Maturity ••...•..................•.•.•..•.••............• 9 3.1.3 Mating..... ...... ...•••... •.. ..• ...•... ....... ...• ..• ... 9 3.1.4 Fertilization........................................... 9 3.1.5 Gonads •.•••.•.......•...•.........•................•.... 9 3.1.6 Spawning....................... .... •••.•.. .•.....• ...... 9 3.1. 7 Spawn................................................... 9 3.2 Pre-Adult Phase .•.....•• ;...................................... 9 3.2.1 Embryonic Phase......................................... 9 3.2.2 Larvae Phase............................................ 11 3.2.3 Adolescent Phase.... ........ ..•. .•.... ....•..... ... ••.•. 11 i • I PAGE 3.3 ",A",d",u::::l.;t-=..Ph=as",e=.. • . • . • . .....•.•..••••..•...••••.•.......•...... 13 3.3.1 Longevity .••...•.•.••..........•...••.....•.•.......•.... 13 3.3.2 Hardiness .•.•.•.....••......•.•.• , .•..••..••• ; ...•••..... 13 3.3.3 Competitors •••........•.••....•...•.......•..•........••.. 14 3.3.4 Predators .•.••..•...•.•....•.....••.•.....••....•...•.•.• 14 3.3.5 Parasites and Diseases ••••.••.•••..• , .••.............•... 14 3.4 Nutrition and Growth............................................ 14 3.4.1 Feeding •••....•..•..•••• ; •.•.•.•...••...••..•..•.•...•••. 14 3.4.2 Food .•..••••.•.••••..•.••..•.•••••.•••....•...•••..•..... 14 3.4.3 Growth .•.•••••••...••••.•..•.•.•.....•..•...•....•..•.... 20 3.4.4 Metabolism ••.•..••••.•.••••.••.•..••.••.....•.....••...•. 21 3.5 Behavior .•••••.••....•••.•.••••..•.•..••..•...•.••.....•.•..• " • 21 3.5.1 Migrations and Local Movements........................... 21 3.5.2 Schooling •....••.......•••••........••.•.....•........... 21 3.5.3 Responses to Stimuli..................................... 23 4. POPULATION 4.1 Structure •.•.•.•.•.•••••...•.•.••...••.•..•........•......•...•• 23 4.1.1 Sex Ratio .•••.•.•••.•.•••..••.•••.. ·••....•............... 23 4.1.2 Age Composition.......................................... 26 4.1.3 Size Composition ..•.•..••..•..•......••........•......... 28 4.2 Abundance and Density........................................... 28 4.2.1 Average Abundance........................................ 28 4.2.2 Changes in Abundance .••..•••..••.•.......•.......•...•... 28 4.2.3 Average Density ....••..••.•••••.•••..•••.••..•... '" ..... 28 4.2.4 Changes in Density....................................... 30 4.3 Natality and ·Recruitment........................................ 30 4.4 Mortali ty and Morbidi ty ., • . • . • • . • •. • . • . • . • • . • . 30 4.4.1 Mortality Rates ••.•.•••........ , .•.•..••.••..••..•..•.... 30 4.5 Dynamics of Population.......................................... 30 4.6 The Population in the Community and the Ecosystem •....•...••.... 30 5. EXPWITATION 5.1 Fishing Equipment... • . .. • . • . • . • . 30 5.1.1 Gears........ •.••. •.•.••. .•... •.•• ............•• ......... 30 5.1.2 Boats .•.•••...•...•... ,. •.•. •.• ...• ••.. •.. •..... ....•.... 31 ii 5.2 Fishing Areas.................................................. 31 5.2.1 General Geographic Distribution .......•........... , .•.•. 31 5.2.2 Geographic Ranges ...............•.•........••.....•..... 31 5.2.3 Depth Ranges............................................ 31 5.2.4 Conditions of the Grounds............................... 31 5.3 Fishing Seasons................................................ 31 5.3.1 General Pattern of Seasons. • . • . • . .. 31 5.3.2 Dates of Beginning. Peak and End of Seasons ....• '.' •. " •. 31 5.3.3 variation in Date and Duration of Season ..•.••••.....••• 34 5.4 Fishing Operations and Results................................. 34 5.4.1 Effort and Intensity.................................... 34 5.4.2 Selectivity •.......•.•...•.............••.•..•...•.•...• 34 5.4.3 Catches................................................. 34 6. PROTECTION AND MANAGEMENT 6.1 Regulatory (Legisla ti ve) Measures.............................. 34 REFERENCES. • . • • . • . • . • . • . • . • . • . • . • . • • • . • 38 iii • I FIGURES PAGE Figure 1. Scup, Stenotomus chrysops (drawing by H. L. TOdd, 1884)....... 4 Figure 2. Egg, embryo and larvae of scup, Stenotomus chrysops (from: Killltz and Radcliffe,· 1918). ..•••••.••••••.••••••••••.• 10 Figure 3. YOilllg and adult scup, Stenotomus chrysops (from: Killltz and Radcliffe, 1918).......................................... 12 Figure 4. Geographic sampling areas used for collecting and analyzing stomach contents of scup, Stenotomus chrysops (from: Maurer and Bowman, 1975) ••••••••.••••••••••••• 15 Figure 5. Summer and winter distribution of scup, Stenotomus chrysops, along the Middle Atlantic and New England coasts.. •. •• • • •• • • • • • • • • . • • • • • • • . • • • • . • • •• • • . • • • . • • • • • • • •• 22 Figure 6. Diurnal variation in trawl catches from autumn research vessel cruises, 1955-1961 (from: Fritz, 1965) ••••••••••••.•••• 24 Figure 7. Length-weight relationship of scup, Stenotomus chrysops, collected in the New York Bight, Jillle 1974 to Jillle 1975 ••..•••• 27 Figure 8. Monthly length-frequency distributions of scup, Stenotomus chrysops, collected in the New York Bight, June 1974 to Jillle 1975 « indicates less than 0.5\) ••••••••••.•••.•.•••••••• 29 Figure 9. The general distribution of the summer trawl fishery ••••••••••• 32 Figure 10. The general distribution of the winter trawl fishery ••••••••••• 33 iv TABLES PAGE Table 1. Reported spawning season, area and authority for scup, Stenotomus chrysops •••.••••....•....•••.••••••.••••.•.••...••.. 8 Table 2. Stomach contents of scup, Stenotomus chrysops, collected between 1969 and 1972 in southern New England and Middle Atlantic (from: Maurer and Bowman, 1975) •••••••..•.•••••••••.• 16 Table 3. Stomach contents of scup, Stenotomus chrys9Ps, expressed as percent of weight, by sampling area (from: Bowman et al., 1976) •••••••••••••.•.••••.•...•.•.••.•••.••••.••••.••.. 18 Table 4. Monthly sex ratios of scup, Stenotomus chrysops, =llected in the New York Bight, June 1974-June 1975 •••••••••••.••••.•.•• 25 Table 5. Landings of scup, Stenotomus chrysops, by state in thousands of pounds, 1879-1976 ..••••••••.•••••.•.••••••..•••••. 35 Table 6. Landings of scup, Stenotomus chrysops, by state, by gear in thousands of pounds for 1973 .................................................. .. 36 Table 7. Sportfish catch statistics for scup taken from Clark (1962), Deuel and Clark (1968) and Deuel (1973) •••••••••••••••••••••••• 37 v • 1. IDENTITY 1.1 Nomenclature 1.1.1 Valid Name Stenotomus chrysops (Linnaeus) 1766. 1.1.2 Subjective Synonymy Sparus chrysops L., 1766 Sparus argyrops L., 1766 Sparus zanthurus Lacepede, 1803 Labrus versicolor Mitchell, 1815 Pagrus argyrops Cuv. and Val., 1830 Sargus arenosus DeKay, 1842 Sargus ambassis Gunther, 1859 Stenotomus chrysops Jordan and Gilbert, 1883 1. 2 Taxonomy 1.2.1 Affinities Suprageneric - Phylum: Vertebrata Subphylum: Craniata Superclass: Gnathostomata Series: Pisces Class: Osteichthyes Order: Perciformes Family: Sparidae Generic - Stenotomus Gill, 1865 The generic description given here is that of Jordan and Evermann (1896): "This genus is close to Calamus, having the same quill-like interhaemal bones, the flattened incisors and antrorose dorsal spine mainly distinguishing it; temporal crest obsolete; frontal bones not gibbous nor porous; antrorose spine attached to the fourth interneural by a downward­ projecting spine about thrice as long as the spine; lateral crest nowhere coalescing with the supraoccipital crest; interorbital area flattish, with two low ridges, a small foramen in each of these above front of pupil; -1- • • interorbital area much contracted anteriorly; a strongly projecting prefrontal process, which make an acute angle wi th the supraorbital." In Latin Stenotomus means narrow (steno) and cutting (tomus) . Specific - Stenotomus chrysops (Linnaeus) '!his specific description is that of Jordan and Evermann (1896)
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